View source for 1966 United States House of Representatives elections

{{Short description|House elections for the 90th U.S. Congress}}
{{Use mdy dates|date=January 2025}}
{{Infobox election
 | election_name      = 1966 United States House of Representatives elections
 | country            = United States
 | flag_year          = 1960
 | type               = legislative
 | ongoing            = no
 | previous_election  = 1964 United States House of Representatives elections
 | previous_year      = 1964
 | election_date      = November 8, 1966
 | image_size         = x180px
 | next_election      = 1968 United States House of Representatives elections
 | next_year          = 1968
 | seats_for_election = All 435 seats in the [[United States House of Representatives]]
 | majority_seats     = 218
 | party1             = Democratic Party (US)
 | image1             = John W. McCormack (Speaker of the US House)(b) (1).jpg
 | leader1            = [[John W. McCormack|John McCormack]]
 | leader_since1      = January 10, 1962
 | leaders_seat1      = {{Ushr|MA|9|T}}
 | last_election1     = 295 seats
 | seats1             = '''248'''
 | seat_change1       = {{Decrease}} 47
 | popular_vote1      = '''26,934,136'''
 | percentage1        = '''50.9%'''
 | swing1             = {{Decrease}} 6.2{{percentage points}}
 | party2             = Republican Party (US)
 | image2             = Gerald ford 1961 (cropped).jpg
 | leader2            = [[Gerald Ford]]
 | leader_since2      = January 3, 1965
 | leaders_seat2      = {{Ushr|MI|5|T}}
 | last_election2     = 140 seats
 | seats2             = 187
 | seat_change2       = {{Increase}} 47
 | popular_vote2      = 25,521,157
 | percentage2        = 48.2%
 | swing2             = {{Increase}} 5.8{{percentage points}}
 | map_image          = File:The 1966 House Elections in the United States.svg
 | map_size           = 320px
 | map_caption        = '''Results:'''<br/>{{Legend0|#92C5DE|Democratic hold}} {{Legend0|#0671B0|Democratic gain}}<br/>{{Legend0|#F48882|Republican hold}} {{Legend0|#CA0120|Republican gain}}
 | title              = [[Speaker of the United States House of Representatives|Speaker]]
 | before_election    = [[John William McCormack|John McCormack]]
 | before_party       = Democratic Party (US)
 | after_election     = [[John William McCormack|John McCormack]]
 | after_party        = Democratic Party (US)
}}
The '''1966 United States House of Representatives elections''' was an election for the [[United States House of Representatives]] on November 8, 1966, to elect members to serve in the [[90th United States Congress]]. They occurred in the middle of [[President of the United States|President]] [[Lyndon B. Johnson]]'s second term. As the [[Vietnam War]] continued to escalate and [[race riot]]s exploded in cities across the country, Johnson's popularity had fallen, and the opposition [[United States Republican Party|Republican Party]] was able to gain a net of 47 seats from Johnson's [[History of the Democratic Party (United States)|Democratic Party]], which nonetheless maintained a clear majority in the House. This was also the first election that occurred after the [[Voting Rights Act of 1965]] became law, the first time since [[1870–71 United States House of Representatives elections|1870]] that a Republican won a House seat in Arkansas, and the first since 1876 that the party did so in [[South Carolina]] (after the same in a [[1965 United States House of Representatives elections|1965 special election]] for the seat).<ref>{{cite book|last1=Heersink|first1=Boris|last2=Jenkins|first2=Jeffrey A.|title=Republican Party Politics and the American South, 1865–1968|date=19 March 2020 |page=256|isbn=978-1107158436}}</ref>

==Republican gains==
{{Incomplete list|date=May 2022}} 
* [[Alaska's at-large congressional district]]: four-term Democratic incumbent [[Ralph Rivers]] was defeated by Republican State Senator [[Howard Pollock]].
* [[Arizona's 3rd congressional district]]: sophomore Democrat [[George F. Senner Jr.]] was defeated by state legislator [[Sam Steiger]].
* [[Arkansas's 3rd congressional district]]: lumber executive and Arkansas GOP chair [[John Paul Hammerschmidt]] defeated incumbent [[James William Trimble]], becoming the first Republican member of Arkansas' congressional delegation since [[Reconstruction era of the United States|Reconstruction]].
* [[California's 18th congressional district]]: onetime Olympic gold medalist [[Bob Mathias]] defeated seven-term Democratic incumbent [[Harlan Hagen]].
* [[California's 25th congressional district]]: [[Charles E. Wiggins]] defeated incumbent Democrat [[Ronald B. Cameron]].
* [[California's 33rd congressional district]]: [[Jerry Pettis]] defeated incumbent [[Kenneth W. Dyal]].
* [[Michigan’s 2nd congressional district]]: [[Marvin Esch]] defeated incumbent Democrat [[Weston E. Vivian]].
* [[Michigan’s 3rd congressional district]]: [[Garry E. Brown]] defeated incumbent Democrat [[Paul H. Todd Jr.]].
* [[Michigan’s 7th congressional district]]: [[Donald Riegle]] defeated incumbent Democrat [[John C. Mackie]].
* [[Michigan’s 11th congressional district]]: [[Phillip Ruppe]] defeated incumbent Democrat [[Raymond F. Clevenger|Raymond Clevenger]].
* [[Michigan’s 19th congressional district]]: [[Jack H. McDonald]] defeated incumbent Democrat [[Billie S. Farnum]].
* [[Texas's 7th congressional district]]: businessman and 1964 U.S. Senate candidate [[George H. W. Bush]] defeated Democratic challenger Frank Briscoe for the seat vacated by [[John Dowdy]] (whose district had been renumbered the [[Texas's 2nd congressional district|second]]).
* [[Texas's 18th congressional district]]: [[Bob Price (Texas politician)|Bob Price]] succeeded retiring Democrat [[Walter E. Rogers]] by defeating Dee Miller.

== Special elections ==
Elections are listed by date and district.

{{USCongressElectionTableHead}}

|-
! {{Ushr|North Carolina|1|X}}
| [[Herbert Covington Bonner]]
| {{Party shading/Democratic}} | Democratic
| [[1940 North Carolina's 1st congressional district special election|1940]]
| {{Party shading/Democratic/Hold}} | Incumbent died November 7, 1965.<br/>New member <!--[[1966 North Carolina's 1st congressional district special election|elected]]-->elected '''February 5, 1966'''.<br/>Democratic hold; winner was later [[#North Carolina|re-elected]].
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Walter B. Jones Sr.]]''' (Democratic) 60.3%
* {{Party stripe|Republican Party (US)}}[[John Porter East]] (Republican) 39.7%
}}

|-
! {{Ushr|New York|17|X}}
| [[John Lindsay]]
| {{Party shading/Republican}} | Republican
| [[1958 United States House of Representatives elections#New York|1958]]
| {{Party shading/Republican/Hold}} | Incumbent resigned December 31, 1965 to become [[Mayor of New York City]].<br/>New member <!--[[1966 New York's 17th congressional district special election|elected]]-->elected '''February 8, 1966'''.<br/>Republican hold; winner was later [[#New York|re-elected]].
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Theodore R. Kupferman]]''' (Republican) 46.4%
* {{Party stripe|Democratic Party (US)}}[[Orin Lehman]] (Democratic) 45.4%
* {{Party stripe|Conservative Party (US)}}Jeffrey St. John (Conservative) 8.2%
}}

|-
! {{Ushr|Texas|8|X}}
| [[Albert Thomas (American politician)|Albert Thomas]]
| {{Party shading/Democratic}} | Democratic
| [[1936 United States House of Representatives elections#Texas|1936]]
| {{Party shading/Democratic/Hold}} | Incumbent died February 15, 1966.<br/>New member <!--[[1966 Texas's 8th congressional district special election|elected]]-->elected '''March 26, 1966'''.<br/>Democratic hold; winner [[#Texas|did not seek re-election]].
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Lera Millard Thomas]]''' (Democratic) 74%
* {{Party stripe|Republican Party (US)}}Louis Leman (Republican) 26%
}}

|-
! {{Ushr|California|14|X}}
| [[John F. Baldwin Jr.]]
| {{Party shading/Republican}} | Republican
| [[1954 United States House of Representatives elections#Califronia|1954]]
| {{Party shading/Democratic}} | Incumbent died March 9, 1966.<br/>New member <!--[[1966 California's 14th congressional district special election|elected]]-->elected '''June 7, 1966'''.<br/>'''Democratic gain'''; winner was later [[#California|re-elected]].
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Jerome Waldie]]''' (Democratic) 51.2%
* {{Party stripe|Republican Party (US)}}[[Frank Newman (educator)|Frank Newman]] (Republican) 31.2%
* {{Party stripe|Republican Party (US)}}John A. Richardson (Republican) 10.6%
* {{Party stripe|Democratic Party (US)}}Leo A. Costa (Democratic) 4.3%
* {{Party stripe|Republican Party (US)}}Doris G. Johnston (Republican) 1.6%
* {{Party stripe|Republican Party (US)}}Talluk B. Wrakstad (Republican) 1.2%
}}

|}

==Overall results==
411 incumbent members sought reelection, but 8 were defeated in primaries and 41 defeated in the general election for a total of 362 incumbents winning.{{sfn|Abramson|Aldrich|Rohde|1995|p=259}}

{| style="width:100%; text-align:center;"
|+ ↓

|- style="color:white;"
| style="background:blue; width:57.01%;" | '''248'''
| style="background:red; width:49.90%;" | '''187'''

|-
| <span style="color:blue;">'''Democrat'''</span>
| <span style="color:red;">'''Republican'''</span>

|}

{| class=wikitable style=text-align:center"

! colspan=2 rowspan=2 | Parties
! colspan=4 | Seats
! colspan=3 | Popular Vote

|-
! [[1964 United States House of Representatives elections|1964]]
! '''1966'''
! Change
! Strength
! Vote
! %
! Change

|-
| {{party color cell|Democratic Party (US)}}
| [[United States Democratic Party|Democratic Party]]
| align=right | 295
| align=right | '''248'''
| align=right | {{Decrease}} 47
| align=right | 57.0%
| align=right | 26,934,136
| align=right | 50.9%
| align=right | {{Decrease}} 6.2%

|-
| {{party color cell|Republican Party (US)}}
| [[United States Republican Party|Republican Party]]
| align=right | 140
| align=right | '''187'''
| align=right | {{Increase}} 47
| align=right | 43.0%
| align=right | 25,521,157
| align=right | 48.2%
| align=right | {{Increase}} 5.8%

|-
| {{party color cell|Conservative Party (US)}}
| [[Conservative Party of New York|Conservative Party]]
| align=right | –
| align=right | –
| align=right | –
| align=right | –
| align=right | 208,756
| align=right | 0.4%
| align=right | {{Increase}} 0.3%

|-
| {{party color cell|Independent}}
| [[Independent politician|Independent]]
| align=right | –
| align=right | –
| align=right | –
| align=right | –
| align=right | 85,641
| align=right | 0.2%
| align=right | {{Steady}}

|-
| {{party color cell|Liberal Party (New York)}}
| [[Liberal Party of New York|Liberal Party]]
| align=right | –
| align=right | –
| align=right | –
| align=right | –
| align=right | 75,303
| align=right | 0.1%
| align=right | {{Decrease}} 0.1%

|-
| {{party color cell|Peace and Freedom Party}}
| [[Peace and Freedom Party]]
| align=right | –
| align=right | –
| align=right | –
| align=right | –
| align=right | 16,922
| align=right | <0.1%
| align=right | {{Steady}}

|-
| {{party color cell|American Independent Party}}
| [[American Independent Party]]
| align=right | –
| align=right | –
| align=right | –
| align=right | –
| align=right | 14,461
| align=right | <0.1%
| align=right | {{Steady}}

|-
| {{party color cell|Constitution Party (US, 1952)}}
| [[Constitution Party (United States, 1952)|Constitution Party]]
| align=right | –
| align=right | –
| align=right | –
| align=right | –
| align=right | 11,110
| align=right | <0.1%
| align=right | {{Steady}}

|-
| {{party color cell|Socialist Workers Party (US)}}
| [[Socialist Labor Party of America|Socialist Labor Party]]
| align=right | –
| align=right | –
| align=right | –
| align=right | –
| align=right | 5,771
| align=right | <0.1%
| align=right | {{Steady}}

|-
| {{party color cell|Socialist Party (US)}}
| [[Independent-Socialist Party]]
| align=right | –
| align=right | –
| align=right | –
| align=right | –
| align=right | 3,502
| align=right | <0.1%
| align=right | {{Steady}}

|-
| {{party color cell|Other parties (US)}}
| [[New Hispano Party]]
| align=right | –
| align=right | –
| align=right | –
| align=right | –
| align=right | 2,263
| align=right | <0.1%
| align=right | {{Steady}}

|-
| {{party color cell|Other parties (US)}}
| [[People's Choice Party (US)|People's Choice Party]]
| align=right | –
| align=right | –
| align=right | –
| align=right | –
| align=right | 1,299
| align=right | <0.1%
| align=right | {{Steady}}

|-
| {{party color cell|Socialist Workers Party (US)}}
| [[Socialist Workers Party (United States)|Socialist Workers Party]]
| align=right | –
| align=right | –
| align=right | –
| align=right | –
| align=right | 1,014
| align=right | <0.1%
| align=right | {{Steady}}

|-
| {{party color cell|Other parties (US)}}
| [[Veteran Party]]
| align=right | –
| align=right | –
| align=right | –
| align=right | –
| align=right | 939
| align=right | <0.1%
| align=right | {{Steady}}

|-
| {{party color cell|Other parties (US)}}
| Others
| align=right | –
| align=right | –
| align=right | –
| align=right | –
| align=right | 29,701
| align=right | 0.1%
| align=right | {{Increase}} 0.1%

|-
! colspan=2 width=100 | Total
! 435
! 435
! 0
! 100.0%
! 52,901,975
! 100.0%
! ——

|}
Source: [http://history.house.gov/Institution/Election-Statistics/Election-Statistics/ Election Statistics – Office of the Clerk]

{{Bar box
|title=Popular vote
|titlebar=#ddd
|width=900px
|barwidth=710px
|bars=
{{Bar percent|Democratic|{{party color|Democratic Party (US)}}|50.91}}
{{Bar percent|Republican|{{party color|Republican Party (US)}}|48.24}}
{{Bar percent|Others|#777777|0.85}}
}}
{{Bar box
|title=House seats
|titlebar=#ddd
|width=900px
|barwidth=710px
|bars=
{{Bar percent|Democratic|{{party color|Democratic Party (US)}}|57.01}}
{{Bar percent|Republican|{{party color|Republican Party (US)}}|42.99}}
}}

<sup>1</sup> One vacancy due to refusal of House to seat [[Adam Clayton Powell Jr.]] ([[United States Democratic Party|D]]-[[New York (state)|New York]])
{|

|- valign=top
| [[File:90 us house membership.png|thumb|450px|
{| align=center
! colspan=2 | House seats by party holding plurality in state

|-
|{{Legend|#00f|80+% to 100% Democratic}}
|{{Legend|#f00|80+% to 100% Republican}}

|-
|{{Legend|#09f|60+% to 80% Democratic}}
|{{Legend|#f66|60+% to 80% Republican}}

|-
|{{Legend|#0ff|≤ 60% Democratic}}
|{{Legend|#f99|≤ 60% Republican}}

|}]]
| [[File:90 us house changes.png|thumb|450px|
{| align=center
|{{Legend|#00f|6+ Democratic gain}}
|{{Legend|#f00|6+ Republican gain}}

|-
|{{Legend|#09f|3-5 Democratic gain}}
|{{Legend|#f66|3-5 Republican gain}}

|-
|{{Legend|#0ff|1-2 Democratic gain}}
|{{Legend|#f99|1-2 Republican gain}}

|-
| align=center colspan=2 | {{Legend|#ccc|no net change}}

|}]]

|}

== Alabama ==
<!--{{Main|1966 United States House of Representatives elections in Alabama}}-->
{{See also|List of United States representatives from Alabama}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Alabama|1|X}}
| [[Jack Edwards (Alabama)|Jack Edwards]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Alabama|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Jack Edwards (Alabama)|Jack Edwards]]''' (Republican) 65.8%
* {{Party stripe|Democratic Party (US)}}Warren L. Finch (Democratic) 34.2%
}}

|-
! {{Ushr|Alabama|2|X}}
| [[William L. Dickinson]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Alabama|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William L. Dickinson]]''' (Republican) 54.6%
* {{Party stripe|Democratic Party (US)}}Robert F. Whaley (Democratic) 45.4%
}}

|-
! {{Ushr|Alabama|3|X}}
| [[George W. Andrews]]
| {{Party shading/Democratic}} | Democratic
| [[1944 United States House of Representatives elections in Alabama|1944]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[George W. Andrews]]''' (Democratic) ''Unopposed''
}}

|-
! {{Ushr|Alabama|4|X}}
| [[Glenn Andrews]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Alabama|1964]]
| {{Party shading/Democratic}} | Incumbent lost re-election.<br/>'''Democratic gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Bill Nichols (politician)|Bill Nichols]]''' (Democratic) 58.4%
* {{Party stripe|Republican Party (US)}}[[Glenn Andrews]] (Republican) 41.6%
}}

|-
! {{Ushr|Alabama|5|X}}
| [[Armistead I. Selden Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in Alabama|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Armistead I. Selden Jr.]]''' (Democratic) ''Unopposed''
}}

|-
! {{Ushr|Alabama|6|X}}
| [[John H. Buchanan Jr.]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Alabama|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John H. Buchanan Jr.]]''' (Republican) 63.4%
* {{Party stripe|Democratic Party (US)}}Walter Emmett Perry (Democratic) 36.6%
}}

|-
! {{Ushr|Alabama|7|X}}
| [[James D. Martin]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Alabama|1964]]
| {{Party shading/Democratic}} | Incumbent retired to [[1966 Alabama gubernatorial election|run for Governor of Alabama]].<br/>'''Democratic gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Tom Bevill]]''' (Democratic) 64.4%
* {{Party stripe|Republican Party (US)}}Wayman Sherrer (Republican) 35.6%
}}

|-
! {{Ushr|Alabama|8|X}}
| [[Robert E. Jones Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1947 Alabama's 8th congressional district special election|1947 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Robert E. Jones Jr.]]''' (Democratic) 72.2%
* {{Party stripe|Republican Party (US)}}Don Mayhall (Republican) 27.8%
}}

|}

== Alaska ==
{{Main|1966 United States House of Representatives election in Alaska}}
{{See also|List of United States representatives from Alaska}}

[[File:1966 United States House of Representatives election in Alaska by State House District.svg|thumb|State House Results]]

{{USCongressElectionTableHead}}

|-
! {{Ushr|Alaska|AL|X}}
| [[Ralph Rivers]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives election in Alaska|1958]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Howard Pollock]]''' (Republican) 51.6%
* {{Party stripe|Democratic Party (US)}}[[Ralph Rivers]] (Democratic) 48.4%
}}

|}

== Arizona ==
<!--{{Main|1966 United States House of Representatives elections in Arizona}}-->
{{See also|List of United States representatives from Arizona}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Arizona|1|X}}
| [[John Jacob Rhodes]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in Arizona|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John Jacob Rhodes]]''' (Republican) 67.1%
* {{Party stripe|Democratic Party (US)}}L. Alton Riggs (Democratic) 32.9%
}}

|-
! {{Ushr|Arizona|2|X}}
| [[Mo Udall]]
| {{Party shading/Democratic}} | Democratic
| [[1961 Arizona's 2nd congressional district special election|1961 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Mo Udall]]''' (Democratic) 59.6%
* {{Party stripe|Republican Party (US)}}G. Alfred McGinnis (Republican) 40.4%
}}

|-
! {{Ushr|Arizona|3|X}}
| [[George F. Senner Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Arizona|1962]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Sam Steiger]]''' (Republican) 56.9%
* {{Party stripe|Democratic Party (US)}}[[George F. Senner Jr.]] (Democratic) 43.1%
}}

|}

== Arkansas ==
<!--{{Main|1966 United States House of Representatives elections in Arkansas}}-->
{{See also|List of United States representatives from Arkansas}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Arkansas|1|X}}
| [[Ezekiel C. Gathings]]
| {{Party shading/Democratic}} | Democratic
| [[1938 United States House of Representatives elections in Arkansas|1938]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Ezekiel C. Gathings]]''' (Democratic) Unopposed
}}

|-
! {{Ushr|Arkansas|2|X}}
| [[Wilbur Mills]]
| {{Party shading/Democratic}} | Democratic
| [[1938 United States House of Representatives elections in Arkansas|1938]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Wilbur Mills]]''' (Democratic) Unopposed
}}

|-
! {{Ushr|Arkansas|3|X}}
| [[James William Trimble]]
| {{Party shading/Democratic}} | Democratic
| [[1944 United States House of Representatives elections in Arkansas|1944]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John Paul Hammerschmidt]]''' (Republican) 53.1%
* {{Party stripe|Democratic Party (US)}}[[James William Trimble]] (Democratic) 46.9%
}}

|-
! {{Ushr|Arkansas|4|X}}
| [[Oren Harris]]
| {{Party shading/Democratic}} | Democratic
| [[1940 United States House of Representatives elections in Arkansas|1940]]
| {{Party shading/Democratic/Hold}} | Incumbent resigned to become district judge.<br/>Democratic hold.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[David Pryor]]''' (Democratic) 65.0%
* {{Party stripe|Republican Party (US)}}[[Lynn Lowe]] (Republican) 35.0%
}}

|}

== California ==
{{Main|1966 United States House of Representatives elections in California}}
{{See also|List of United States representatives from California}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|California|1|X}}
| [[Don Clausen]]
| {{Party shading/Republican}} | Republican
| [[1963 California's 1st congressional district special election|1963 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Don Clausen]]''' (Republican) 65.1%
* {{Party stripe|Democratic Party (US)}}Thomas T. Storer (Democratic) 34.9%
}}

|-
! {{Ushr|California|2|X}}
| [[Bizz Johnson]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in California|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Bizz Johnson]]''' (Democratic) 70.9%
* {{Party stripe|Republican Party (US)}}William H. Romack Jr. (Republican) 29.1%
}}

|-
! {{Ushr|California|3|X}}
| [[John E. Moss]]
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in California|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John E. Moss]]''' (Democratic) 67.5%
* {{Party stripe|Republican Party (US)}}Terry G. Feil (Republican) 32.5%
}}

|-
! {{Ushr|California|4|X}}
| [[Robert Leggett]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in California|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Robert Leggett]]''' (Democratic) 59.5%
* {{Party stripe|Republican Party (US)}}Tom McHatton (Republican) 40.5%
}}

|-
! {{Ushr|California|5|X}}
| [[Phillip Burton]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in California|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Phillip Burton]]''' (Democratic) 71.3%
* {{Party stripe|Republican Party (US)}}Terry R. Macken (Republican) 28.7%
}}

|-
! {{Ushr|California|6|X}}
| [[William S. Mailliard]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in California|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William S. Mailliard]]''' (Republican) 76.6%
* {{Party stripe|Democratic Party (US)}}Le Rue Grim (Democratic) 23.4%
}}

|-
! {{Ushr|California|7|X}}
| [[Jeffery Cohelan]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in California|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Jeffery Cohelan]]''' (Democratic) 64.4%
* {{Party stripe|Republican Party (US)}}Malcolm M. Champlin (Republican) 35.6%
}}

|-
! {{Ushr|California|8|X}}
| [[George P. Miller]]
| {{Party shading/Democratic}} | Democratic
| [[1944 United States House of Representatives elections in California|1944]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[George P. Miller]]''' (Democratic) 65.4%
* {{Party stripe|Republican Party (US)}}Raymond P. Britton (Republican) 34.6%
}}

|-
! {{Ushr|California|9|X}}
| [[Don Edwards]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in California|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Don Edwards]]''' (Democratic) 63.2%
* {{Party stripe|Republican Party (US)}}Wilbur G. Durkee (Republican) 36.8%
}}

|-
! {{Ushr|California|10|X}}
| [[Charles Gubser]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in California|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Charles Gubser]]''' (Republican) 69.1%
* {{Party stripe|Democratic Party (US)}}George Leppert (Democratic) 30.9%
}}

|-
! {{Ushr|California|11|X}}
| [[J. Arthur Younger]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in California|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[J. Arthur Younger]]''' (Republican) 59.4%
* {{Party stripe|Democratic Party (US)}}W. Mark Sullivan (Democratic) 40.6%
}}

|-
! {{Ushr|California|12|X}}
| [[Burt Talcott]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in California|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Burt Talcott]]''' (Republican) 77.3%
* {{Party stripe|Democratic Party (US)}}Gerald V. Barron (Democratic) 22.7%
}}

|-
! {{Ushr|California|13|X}}
| [[Charles M. Teague]]
| {{Party shading/Republican}} | Republican
| [[1954 United States House of Representatives elections in California|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Charles M. Teague]]''' (Republican) 67.5%
* {{Party stripe|Democratic Party (US)}}Charles A. Storke (Democratic) 32.5%
}}

|-
! {{Ushr|California|14|X}}
| [[Jerome Waldie]]
| {{Party shading/Democratic}} | Democratic
| [[1966 United States House of Representatives elections in California|1966]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Jerome Waldie]]''' (Democratic) 56.4%
* {{Party stripe|Republican Party (US)}}[[Frank Newman (educator)|Frank Newman]] (Republican) 43.6%
}}

|-
! {{Ushr|California|15|X}}
| [[John J. McFall]]
| {{Party shading/Democratic}} | Democratic
| [[1956 United States House of Representatives elections in California|1956]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John J. McFall]]''' (Democratic) 57.0%
* {{Party stripe|Republican Party (US)}}Sam Van Dyken (Republican) 43.0%
}}

|-
! {{Ushr|California|16|X}}
| [[B. F. Sisk]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in California|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[B. F. Sisk]]''' (Democratic) 71.4%
* {{Party stripe|Republican Party (US)}}[[Cecil F. White]] (Republican) 28.6%
}}

|-
! {{Ushr|California|17|X}}
| [[Cecil R. King]]
| {{Party shading/Democratic}} | Democratic
| [[1942 United States House of Representatives elections in California|1942]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Cecil R. King]]''' (Democratic) 60.8%
* {{Party stripe|Republican Party (US)}}Don Cortum (Republican) 39.2%
}}

|-
! {{Ushr|California|18|X}}
| [[Harlan Hagen]]
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in California|1952]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Bob Mathias]]''' (Republican) 55.9%
* {{Party stripe|Democratic Party (US)}}[[Harlan Hagen]] (Democratic) 44.1%
}}

|-
! {{Ushr|California|19|X}}
| [[Chet Holifield]]
| {{Party shading/Democratic}} | Democratic
| [[1942 United States House of Representatives elections in California|1942]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Chet Holifield]]''' (Democratic) 62.3%
* {{Party stripe|Republican Party (US)}}William R. Sutton (Republican) 37.7%
}}

|-
! {{Ushr|California|20|X}}
| [[H. Allen Smith (politician)|H. Allen Smith]]
| {{Party shading/Republican}} | Republican
| [[1956 United States House of Representatives elections in California|1956]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[H. Allen Smith (politician)|H. Allen Smith]]''' (Republican) 73.4%
* {{Party stripe|Democratic Party (US)}}Raymond Freschi (Democratic) 26.6%
}}

|-
! {{Ushr|California|21|X}}
| [[Augustus Hawkins]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in California|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Augustus Hawkins]]''' (Democratic) 84.8%
* {{Party stripe|Republican Party (US)}}Rayfield Lundy (Republican) 15.2%
}}

|-
! {{Ushr|California|22|X}}
| [[James C. Corman]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in California|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[James C. Corman]]''' (Democratic) 53.5%
* {{Party stripe|Republican Party (US)}}[[Bob Cline]] (Republican) 46.5%
}}

|-
! {{Ushr|California|23|X}}
| [[Del M. Clawson]]
| {{Party shading/Republican}} | Republican
| [[1963 United States House of Representatives elections|1963 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Del M. Clawson]]''' (Republican) 67.4%
* {{Party stripe|Democratic Party (US)}}Ed O'Connor (Democratic) 32.6%
}}

|-
! {{Ushr|California|24|X}}
| [[Glenard P. Lipscomb]]
| {{Party shading/Republican}} | Republican
| [[1953 United States House of Representatives elections|1953 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Glenard P. Lipscomb]]''' (Republican) 76.3%
* {{Party stripe|Democratic Party (US)}}Earl G. McNall (Democratic) 23.7%
}}

|-
! {{Ushr|California|25|X}}
| [[Ronald B. Cameron]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in California|1962]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Charles E. Wiggins]]''' (Republican) 52.6%
* {{Party stripe|Democratic Party (US)}}[[Ronald B. Cameron]] (Democratic) 47.4%
}}

|-
! {{Ushr|California|26|X}}
| [[Thomas M. Rees]]
| {{Party shading/Democratic}} | Democratic
| [[1965 United States House of Representatives elections|1965 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Thomas M. Rees]]''' (Democratic) 62.3%
* {{Party stripe|Republican Party (US)}}Irving Teichner (Republican) 37.7%
}}

|-
! {{Ushr|California|27|X}}
| [[Edwin Reinecke]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in California|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Edwin Reinecke]]''' (Republican) 65.3%
* {{Party stripe|Democratic Party (US)}}John A. "Jack" Howard (Democratic) 34.7%
}}

|-
! {{Ushr|California|28|X}}
| [[Alphonzo E. Bell Jr.]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in California|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Alphonzo E. Bell Jr.]]''' (Republican) 72.3%
* {{Party stripe|Democratic Party (US)}}Lawrence "Lorry" Sherman (Democratic) 27.7%
}}

|-
! {{Ushr|California|29|X}}
| [[George Brown Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in California|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[George Brown Jr.]]''' (Democratic) 51.1%
* {{Party stripe|Republican Party (US)}}Bill Orozco (Republican) 48.9%
}}

|-
! {{Ushr|California|30|X}}
| [[Edward R. Roybal]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in California|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Edward R. Roybal]]''' (Democratic) 66.4%
* {{Party stripe|Republican Party (US)}}Henri O'Bryant Jr. (Republican) 33.6%
}}

|-
! {{Ushr|California|31|X}}
| [[Charles H. Wilson]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in California|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Charles H. Wilson]]''' (Democratic) 63.4%
* {{Party stripe|Republican Party (US)}}Theodore Smith (Republican) 36.6%
}}

|-
! {{Ushr|California|32|X}}
| [[Craig Hosmer]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in California|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Craig Hosmer]]''' (Republican) 80.1%
* {{Party stripe|Democratic Party (US)}}Tracy Odell (Democratic) 19.9%
}}

|-
! {{Ushr|California|33|X}}
| [[Kenneth W. Dyal]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in California|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Jerry Pettis]]''' (Republican) 53.5%
* {{Party stripe|Democratic Party (US)}}[[Kenneth W. Dyal]] (Democratic) 46.5%
}}

|-
! {{Ushr|California|34|X}}
| [[Richard T. Hanna]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in California|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Richard T. Hanna]]''' (Democratic) 55.8%
* {{Party stripe|Republican Party (US)}}Frank LaMagna (Republican) 44.2%
}}

|-
! {{Ushr|California|35|X}}
| [[James B. Utt]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in California|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[James B. Utt]]''' (Republican) 73.1%
* {{Party stripe|Democratic Party (US)}}Thomas B. Lenhart (Democratic) 26.9%
}}

|-
! {{Ushr|California|36|X}}
| [[Bob Wilson (politician)|Bob Wilson]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in California|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Bob Wilson (politician)|Bob Wilson]]''' (Republican) 72.9%
* {{Party stripe|Democratic Party (US)}}William C. Godfrey (Democratic) 27.1%
}}

|-
! {{Ushr|California|37|X}}
| [[Lionel Van Deerlin]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in California|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Lionel Van Deerlin]]''' (Democratic) 61.2%
* {{Party stripe|Republican Party (US)}}Samuel S. Vener (Republican) 38.8%
}}

|-
! {{Ushr|California|38|X}}
| [[John V. Tunney]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in California|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John V. Tunney]]''' (Democratic) 54.5%
* {{Party stripe|Republican Party (US)}}[[Robert R. Barry]] (Republican) 45.5%
}}

|}

== Colorado ==
<!--{{Main|1966 United States House of Representatives elections in Colorado}}-->
{{See also|List of United States representatives from Colorado}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Colorado|1|X}}
| [[Byron G. Rogers]]
| {{Party shading/Democratic}} | Democratic
| [[1950 United States House of Representatives elections in Colorado|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Byron G. Rogers]]''' (Democratic) 56.0%
* {{Party stripe|Republican Party (US)}}Greg Pearson (Republican) 44.0%
}}

|-
! {{Ushr|Colorado|2|X}}
| [[Roy H. McVicker]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Colorado|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Donald G. Brotzman]]''' (Republican) 51.7%
* {{Party stripe|Democratic Party (US)}}[[Roy H. McVicker]] (Democratic) 47.1%
* {{Party stripe|Independent}}Joe Lucero (New Hispano) 1.2%
}}

|-
! {{Ushr|Colorado|3|X}}
| [[Frank Evans (politician)|Frank Evans]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Colorado|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Frank Evans (politician)|Frank Evans]]''' (Democratic) 51.7%
* {{Party stripe|Republican Party (US)}}David W. Enoch (Republican) 48.3%
}}

|-
! {{Ushr|Colorado|4|X}}
| [[Wayne N. Aspinall]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in Colorado|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Wayne N. Aspinall]]''' (Democratic) 58.6%
* {{Party stripe|Republican Party (US)}}[[James Paul Johnson]] (Republican) 41.4%
}}

|}

== Connecticut ==
<!--{{Main|1966 United States House of Representatives elections in Connecticut}}-->
{{See also|List of United States representatives from Connecticut}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Connecticut|1|X}}
| [[Emilio Q. Daddario]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Connecticut|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Emilio Q. Daddario]]''' (Democratic) 58.0%
* {{Party stripe|Republican Party (US)}}John L. Bonee (Republican) 41.2%
* {{Party stripe|People's Choice Party}}Donald B. LaCroix (People's Choice) 0.8%
}}

|-
! {{Ushr|Connecticut|2|X}}
| [[William St. Onge]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Connecticut|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William St. Onge]]''' (Democratic) 56.2%
* {{Party stripe|Republican Party (US)}}Joseph H. Goldberg (Republican) 43.2%
* {{Party stripe|Independent}}Daniel R. Tarasevich (Veteran) 0.6%
}}

|-
! {{Ushr|Connecticut|3|X}}
| [[Robert Giaimo]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Connecticut|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Robert Giaimo]]''' (Democratic) 53.1%
* {{Party stripe|Republican Party (US)}}Stelio Salmona (Republican) 41.5%
* {{Party stripe|American Independent Party}}Robert M. Cook (American Independent) 5.4%
}}

|-
! {{Ushr|Connecticut|4|X}}
| [[Donald J. Irwin]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Connecticut|1958]]<br/>1960 {{Small|(lost)}}<br/>[[1964 United States House of Representatives elections in Connecticut|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Donald J. Irwin]]''' (Democratic) 51.0%
* {{Party stripe|Republican Party (US)}}[[Abner W. Sibal]] (Republican) 49.0%
}}

|-
! {{Ushr|Connecticut|5|X}}
| [[John S. Monagan]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Connecticut|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John S. Monagan]]''' (Democratic) 59.1%
* {{Party stripe|Republican Party (US)}}Romeo G. Petroni (Republican) 40.9%
}}

|-
! {{Ushr|Connecticut|6|X}}
| [[Bernard F. Grabowski]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Connecticut|1962]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Thomas Meskill]]''' (Republican) 48.9%
* {{Party stripe|Democratic Party (US)}}[[Bernard F. Grabowski]] (Democratic) 47.7%
* {{Party stripe|American Independent Party}}Stephen Minot (American Independent) 3.4%
}}

|}

== Delaware ==
{{Main|1966 United States House of Representatives election in Delaware}}
{{See also|List of United States representatives from Delaware}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Delaware|AL|X}}
| [[Harris McDowell]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives election in Delaware|1958]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William Roth]]''' (Republican) 55.8%
* {{Party stripe|Democratic Party (US)}}[[Harris McDowell]] (Democratic) 44.2%
}}

|}

== Florida ==
<!--{{Main|1966 United States House of Representatives elections in Florida}}-->
{{See also|List of United States representatives from Florida}}

Florida redistricted to adjust for demographic changes; in addition to minor boundary changes a district was removed from northern Florida, and Broward County was broken out into its own district.<ref name="martis">{{Cite book |title=The Historical Atlas of Political Parties in the United States Congress, 1789–1989 |last=Martis |first=Kenneth C. |publisher=Prentice Hall College Div |year=1989 |isbn=0-02-920170-5}}</ref>

{{USCongressElectionTableHead}}

|-
! {{Ushr|Florida|1|X}}
| [[Bob Sikes]]
| {{Party shading/Democratic}} | Democratic
| [[1940 United States House of Representatives elections in Florida|1940]]<br/>1944 {{Small|(resigned)}}<br/>[[1944 United States House of Representatives elections in Florida|1974]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Bob Sikes]]''' (Democratic) ''Unopposed''

|-
! rowspan=2 | {{Ushr|Florida|2|X}}
| [[Don Fuqua]]<br/>{{Small|Redistricted from the {{Ushr|FL|9|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Florida|1962]]
| Incumbent re-elected.
| rowspan=2 nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Don Fuqua]]''' (Democratic) 76.3%
* {{Party stripe|Republican Party (US)}}Harold Hill (Republican) 23.7%
}}

|-
| [[D. R. Matthews]]<br/>{{Small|Redistricted from the {{Ushr|FL|8|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in Florida|1952]]
| {{Party shading/Loss}} | Incumbent lost renomination.<br/>'''Democratic loss'''.

|-
! {{Ushr|Florida|3|X}}
| [[Charles E. Bennett (politician)|Charles E. Bennett]]<br/>{{Small|Redistricted from the {{Ushr|FL|2|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in Florida|1948]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Charles E. Bennett (politician)|Charles E. Bennett]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Florida|4|X}}
| [[Syd Herlong]]<br/>{{Small|Redistricted from the {{Ushr|FL|5|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in Florida|1948]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Syd Herlong]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Florida|5|X}}
| [[Edward Gurney]]<br/>{{Small|Redistricted from the {{Ushr|FL|11|C}}}}
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in Florida|1962]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Edward Gurney]]''' (Republican) ''Unopposed''

|-
! {{Ushr|Florida|6|X}}
| [[Sam Gibbons]]<br/>{{Small|Redistricted from the {{Ushr|FL|10|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Florida|1962]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Sam Gibbons]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Florida|7|X}}
| [[James A. Haley]]
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in Florida|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[James A. Haley]]''' (Democratic) 63.2%
* {{Party stripe|Republican Party (US)}}Joe Z. Lovingood (Republican) 36.8%
}}

|-
! {{Ushr|Florida|8|X}}
| [[William C. Cramer]]<br/>{{Small|Redistricted from the {{Ushr|FL|12|C}}}}
| {{Party shading/Republican}} | Republican
| [[1954 United States House of Representatives elections in Florida|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William C. Cramer]]''' (Republican) 70.8%
* {{Party stripe|Democratic Party (US)}}Roy L. Reynolds (Democratic) 29.2%
}}

|-
! {{Ushr|Florida|9|X}}
| [[Paul Rogers (politician)|Paul Rogers]]<br/>{{Small|Redistricted from the {{Ushr|FL|6|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Florida|1954]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Paul Rogers (politician)|Paul Rogers]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Florida|10|X}}
| colspan=3 | None (district created)
| {{Party shading/Republican}} | New seat.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[J. Herbert Burke]]''' (Republican) 61.1%
* {{Party stripe|Democratic Party (US)}}Joe Varon (Democratic) 38.9%
}}

|-
! {{Ushr|Florida|11|X}}
| [[Claude Pepper]]<br/>{{Small|Redistricted from the {{Ushr|FL|3|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Florida|1962]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Claude Pepper]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Florida|12|X}}
| [[Dante Fascell]]<br/>{{Small|Redistricted from the {{Ushr|FL|4|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Florida|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Dante Fascell]]''' (Democratic) 56.9%
* {{Party stripe|Republican Party (US)}}Mike Thompson (Republican) 43.1%
}}

|}

== Georgia ==
<!--{{Main|1966 United States House of Representatives elections in Georgia}}-->
{{See also|List of United States representatives from Georgia}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Georgia|1|X}}
| [[G. Elliott Hagan]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in Georgia|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[G. Elliott Hagan]]''' (Democratic) 58.0%
* {{Party stripe|Republican Party (US)}}Porter Carswell (Republican) 42.0%
}}

|-
! {{Ushr|Georgia|2|X}}
| [[Maston E. O'Neal Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Georgia|1964]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Maston E. O'Neal Jr.]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Georgia|3|X}}
| [[Bo Callaway]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Georgia|1964]]
| {{Party shading/Democratic}} | Incumbent retired to [[1966 Georgia gubernatorial election|run for governor]].<br/>'''Democratic gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Jack Brinkley]]''' (Democratic) 61.8%
* {{Party stripe|Republican Party (US)}}Billy J. Mixon (Republican) 38.2%
}}

|-
! {{Ushr|Georgia|4|X}}
| [[James MacKay (Georgia politician)|James MacKay]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Georgia|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Benjamin B. Blackburn]]''' (Republican) 50.2%
* {{Party stripe|Democratic Party (US)}}[[James MacKay (Georgia politician)|James MacKay]] (Democratic) 49.8%
}}

|-
! {{Ushr|Georgia|5|X}}
| [[Charles L. Weltner]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Georgia|1962]]
| {{Party shading/Republican}} | Incumbent withdrew and was replaced on the ballot.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Fletcher Thompson]]''' (Republican) 60.1%
* {{Party stripe|Democratic Party (US)}}Archie L. Lindsey (Democratic) 39.9%
}}

|-
! {{Ushr|Georgia|6|X}}
| [[John Flynt]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Georgia|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John Flynt]]''' (Democratic) 67.9%
* {{Party stripe|Republican Party (US)}}G. Paul Jones Jr. (Republican) 32.1%
}}

|-
! {{Ushr|Georgia|7|X}}
| [[John William Davis (Georgia politician)|John William Davis]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in Georgia|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John William Davis (Georgia politician)|John William Davis]]''' (Democratic) 65.0%
* {{Party stripe|Republican Party (US)}}Edward Y. Chapin (Republican) 35.0%
}}

|-
! {{Ushr|Georgia|8|X}}
| [[J. Russell Tuten]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Georgia|1962]]
| {{Party shading/Democratic/Hold}} | Incumbent lost renomination.<br/>Democratic hold.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[W. S. Stuckey Jr.]]''' (Democratic) 77.0%
* {{Party stripe|Republican Party (US)}}[[Mack Mattingly]] (Republican) 23.0%
}}

|-
! {{Ushr|Georgia|9|X}}
| [[Phillip M. Landrum]]
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in Georgia|1952]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Phillip M. Landrum]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Georgia|10|X}}
| [[Robert Grier Stephens Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in Georgia|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Robert Grier Stephens Jr.]]''' (Democratic) 65.5%
* {{Party stripe|Republican Party (US)}}Leroy H. Simkins (Republican) 34.5%
}}

|}

== Hawaii ==
<!--{{Main|1966 United States House of Representatives election in Hawaii}}-->
{{See also|List of United States representatives from Hawaii}}

{{USCongressElectionTableHead}}

|-
! rowspan=2 | {{Ushr|Hawaii|AL|X}}
| [[Spark Matsunaga]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives election in Hawaii|1962]]
| Incumbent re-elected.
| rowspan=2 nowrap | {{Small|Elected on a [[general ticket]]:}}{{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Patsy Mink]]''' (Democratic) 34.3%
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Spark Matsunaga]]''' (Democratic) 34.1%
* {{Party stripe|Republican Party (US)}}[[John Carroll (Hawaii politician)|John Carroll]] (Republican) 16.4%
* {{Party stripe|Republican Party (US)}}[[James Kealoha]] (Republican) 15.2%
}}

|-
| [[Patsy Mink]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives election in Hawaii|1964]]
| Incumbent re-elected.

|}

== Idaho ==
<!--{{Main|1966 United States House of Representatives elections in Idaho}}-->
{{See also|List of United States representatives from Idaho}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Idaho|1|X}}
| [[Compton I. White Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Idaho|1962]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Jim McClure (politician)|Jim McClure]]''' (Republican) 51.8%
* {{Party stripe|Democratic Party (US)}}[[Compton I. White Jr.]] (Democratic) 48.2%
}}

|-
! {{Ushr|Idaho|2|X}}
| [[George V. Hansen]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Idaho|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[George V. Hansen]]''' (Republican) 70.3%
* {{Party stripe|Democratic Party (US)}}A. W. Brunt (Democratic) 29.7%
}}

|}

== Illinois ==
<!--{{Main|1966 United States House of Representatives elections in Illinois}}-->
{{See also|List of United States representatives from Illinois}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Illinois|1|X}}
| [[William L. Dawson (politician)|William L. Dawson]]
| {{Party shading/Democratic}} | Democratic
| [[1942 United States House of Representatives elections in Illinois|1942]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William L. Dawson (politician)|William L. Dawson]]''' (Democratic) 72.6%
* {{Party stripe|Republican Party (US)}}David R. Reed (Republican) 27.4%
}}

|-
! {{Ushr|Illinois|2|X}}
| [[Barratt O'Hara]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in Illinois|1948]]<br/>1950 {{Small|(lost)}}<br/>[[1952 United States House of Representatives elections in Illinois|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Barratt O'Hara]]''' (Democratic) 59.2%
* {{Party stripe|Republican Party (US)}}Philip G. Bixler (Republican) 40.8%
}}

|-
! {{Ushr|Illinois|3|X}}
| [[William T. Murphy]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Illinois|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William T. Murphy]]''' (Democratic) 52.0%
* {{Party stripe|Republican Party (US)}}Alfred F. Manion (Republican) 48.0%
}}

|-
! {{Ushr|Illinois|4|X}}
| [[Ed Derwinski]]
| {{Party shading/Republican}} | Republican
| [[1958 United States House of Representatives elections in Illinois|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Ed Derwinski]]''' (Republican) 72.0%
* {{Party stripe|Democratic Party (US)}}Ray J. Rybacki (Democratic) 28.0%
}}

|-
! {{Ushr|Illinois|5|X}}
| [[John C. Kluczynski]]
| {{Party shading/Democratic}} | Democratic
| [[1950 United States House of Representatives elections in Illinois|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John C. Kluczynski]]''' (Democratic) 56.2%
* {{Party stripe|Republican Party (US)}}Walter K. Kiltz (Republican) 43.8%
}}

|-
! {{Ushr|Illinois|6|X}}
| [[Daniel J. Ronan]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Illinois|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Daniel J. Ronan]]''' (Democratic) 57.0%
* {{Party stripe|Republican Party (US)}}Samuel A. DeCaro (Republican) 43.0%
}}

|-
! {{Ushr|Illinois|7|X}}
| [[Frank Annunzio]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Illinois|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Frank Annunzio]]''' (Democratic) 80.9%
* {{Party stripe|Republican Party (US)}}Joseph D. Day (Republican) 19.1%
}}

|-
! {{Ushr|Illinois|8|X}}
| [[Dan Rostenkowski]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Illinois|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Dan Rostenkowski]]''' (Democratic) 59.9%
* {{Party stripe|Republican Party (US)}}John H. Leszynski (Republican) 40.1%
}}

|-
! {{Ushr|Illinois|9|X}}
| [[Sidney R. Yates]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in Illinois|1948]]<br/>1962 {{Small|(retired)}}<br/>[[1964 United States House of Representatives elections|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Sidney R. Yates]]''' (Democratic) 59.9%
* {{Party stripe|Republican Party (US)}}Richard C. Storey Jr. (Republican) 40.1%
}}

|-
! {{Ushr|Illinois|10|X}}
| [[Harold R. Collier]]
| {{Party shading/Republican}} | Republican
| [[1956 United States House of Representatives elections in Illinois|1956]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Harold R. Collier]]''' (Republican) 69.4%
* {{Party stripe|Democratic Party (US)}}[[Frank J. Jirka Jr.]] (Democratic) 30.6%
}}

|-
! {{Ushr|Illinois|11|X}}
| [[Roman Pucinski]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Illinois|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Roman Pucinski]]''' (Democratic) 50.9%
* {{Party stripe|Republican Party (US)}}[[John J. Hoellen Jr.]] (Republican) 49.1%
}}

|-
! {{Ushr|Illinois|12|X}}
| [[Robert McClory]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in Illinois|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Robert McClory]]''' (Republican) 69.1%
* {{Party stripe|Democratic Party (US)}}Herbert L. Stern (Democratic) 30.9%
}}

|-
! {{Ushr|Illinois|13|X}}
| [[Donald Rumsfeld]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in Illinois|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Donald Rumsfeld]]''' (Republican) 76.0%
* {{Party stripe|Democratic Party (US)}}James L. McCabe (Democratic) 24.0%
}}

|-
! {{Ushr|Illinois|14|X}}
| [[John N. Erlenborn]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Illinois|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John N. Erlenborn]]''' (Republican) 71.7%
* {{Party stripe|Democratic Party (US)}}Kenneth McCleary (Democratic) 28.3%
}}

|-
! {{Ushr|Illinois|15|X}}
| [[Charlotte Thompson Reid]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in Illinois|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Charlotte Thompson Reid]]''' (Republican) 72.3%
* {{Party stripe|Democratic Party (US)}}Selwyn L. Boyer (Democratic) 27.7%
}}

|-
! {{Ushr|Illinois|16|X}}
| [[John B. Anderson]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Illinois|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John B. Anderson]]''' (Republican) 73.0%
* {{Party stripe|Democratic Party (US)}}Robert M. Whiteford (Democratic) 27.0%
}}

|-
! {{Ushr|Illinois|17|X}}
| [[Leslie C. Arends]]
| {{Party shading/Republican}} | Republican
| [[1934 United States House of Representatives elections in Illinois|1934]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Leslie C. Arends]]''' (Republican) 67.4%
* {{Party stripe|Democratic Party (US)}}Bernard J. Hughes (Democratic) 32.6%
}}

|-
! {{Ushr|Illinois|18|X}}
| [[Robert H. Michel]]
| {{Party shading/Republican}} | Republican
| [[1956 United States House of Representatives elections in Illinois|1956]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Robert H. Michel]]''' (Republican) 58.4%
* {{Party stripe|Democratic Party (US)}}Thomas V. Cassidy (Democratic) 41.6%
}}

|-
! {{Ushr|Illinois|19|X}}
| [[Gale Schisler]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Illinois|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Tom Railsback]]''' (Republican) 52.3%
* {{Party stripe|Democratic Party (US)}}[[Gale Schisler]] (Democratic) 47.7%
}}

|-
! {{Ushr|Illinois|20|X}}
| [[Paul Findley]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Illinois|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Paul Findley]]''' (Republican) 62.2%
* {{Party stripe|Democratic Party (US)}}Richard R. Wolfe (Democratic) 37.8%
}}

|-
! {{Ushr|Illinois|21|X}}
| [[Kenneth J. Gray]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Illinois|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Kenneth J. Gray]]''' (Democratic) 56.2%
* {{Party stripe|Republican Party (US)}}[[G. R. Beckmeyer]] (Republican) 43.8%
}}

|-
! {{Ushr|Illinois|22|X}}
| [[William L. Springer]]
| {{Party shading/Republican}} | Republican
| [[1950 United States House of Representatives elections in Illinois|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William L. Springer]]''' (Republican) 63.3%
* {{Party stripe|Democratic Party (US)}}Cameron B. Satterthwaite (Democratic) 36.7%
}}

|-
! {{Ushr|Illinois|23|X}}
| [[George E. Shipley]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Illinois|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[George E. Shipley]]''' (Democratic) 56.4%
* {{Party stripe|Republican Party (US)}}Leslie N. Jones (Republican) 43.6%
}}

|-
! {{Ushr|Illinois|24|X}}
| [[Melvin Price]]
| {{Party shading/Democratic}} | Democratic
| [[1944 United States House of Representatives elections in Illinois|1944]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Melvin Price]]''' (Democratic) 71.5%
* {{Party stripe|Republican Party (US)}}John S. Guthrie (Republican) 28.5%
}}

|}

== Indiana ==
<!--{{Main|1966 United States House of Representatives elections in Indiana}}-->
{{See also|List of United States representatives from Indiana}}

Indiana redistricted for this election, election boundary changes forced two Republican incumbents into the same district while creating a new district that was won by another Republican.<ref name="martis" />

{{USCongressElectionTableHead}}

|-
! {{Ushr|Indiana|1|X}}
| [[Ray Madden]]
| {{Party shading/Democratic}} | Democratic
| [[1942 United States House of Representatives elections in Indiana|1942]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Ray Madden]]''' (Democratic) 58.3%
* {{Party stripe|Republican Party (US)}}Albert Harrigan (Republican) 41.7%
}}

|-
! {{Ushr|Indiana|2|X}}
| [[Charles A. Halleck]]
| {{Party shading/Republican}} | Republican
| [[1935 United States House of Representatives elections|1935 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Charles A. Halleck]]''' (Republican) 57.5%
* {{Party stripe|Democratic Party (US)}}Ralph G. McFadden (Democratic) 42.5%
}}

|-
! {{Ushr|Indiana|3|X}}
| [[John Brademas]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Indiana|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John Brademas]]''' (Democratic) 55.8%
* {{Party stripe|Republican Party (US)}}Robert A. Ehlers (Republican) 44.2%
}}

|-
! {{Ushr|Indiana|4|X}}
| [[E. Ross Adair]]
| {{Party shading/Republican}} | Republican
| [[1950 United States House of Representatives elections in Indiana|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[E. Ross Adair]]''' (Republican) 63.5%
* {{Party stripe|Democratic Party (US)}}J. Byron Hayes (Democratic) 36.5%
}}

|-
! {{Ushr|Indiana|5|X}}
| [[J. Edward Roush]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Indiana|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[J. Edward Roush]]''' (Democratic) 51.1%
* {{Party stripe|Republican Party (US)}}Kenneth Bowman (Republican) 48.9%
}}

|-
! {{Ushr|Indiana|6|X}}
| [[William G. Bray]]<br/>{{Small|Redistricted from the {{Ushr|IN|7|C}}}}
| {{Party shading/Republican}} | Republican
| [[1950 United States House of Representatives elections in Indiana|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William G. Bray]]''' (Republican) 65.7%
* {{Party stripe|Democratic Party (US)}}James M. Nicholson (Democratic) 33.6%
* {{Party stripe|Independent}}Henry W. Holt (Independent) 0.7%
}}

|-
! {{Ushr|Indiana|7|X}}
| colspan=3 | None (district created)
| {{Party shading/Republican}} | New seat.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John T. Myers (politician)|John T. Myers]]''' (Republican) 54.3%
* {{Party stripe|Democratic Party (US)}}Elden C. Tipton (Democratic) 45.7%
}}

|-
! {{Ushr|Indiana|8|X}}
| [[Winfield K. Denton]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Indiana|1954]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Roger H. Zion]]''' (Republican) 51.1%
* {{Party stripe|Democratic Party (US)}}[[Winfield K. Denton]] (Democratic) 48.9%
}}

|-
! {{Ushr|Indiana|9|X}}
| [[Lee Hamilton]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Indiana|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Lee Hamilton]]''' (Democratic) 53.8%
* {{Party stripe|Republican Party (US)}}John W. Lewis (Republican) 46.2%
}}

|-
! rowspan=2 | {{Ushr|Indiana|10|X}}
| [[Richard L. Roudebush]]<br/>{{Small|Redistricted from the {{Ushr|IN|6|C}}}}
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Indiana|1960]]
| Incumbent re-elected.
| rowspan=2 nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Richard L. Roudebush]]''' (Republican) 63.4%
* {{Party stripe|Democratic Party (US)}}Robert H. Staton (Democratic) 36.6%
}}

|-
| [[Ralph Harvey]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Indiana|1960]]
| {{Party shading/Loss}} | Incumbent lost renomination.<br/>'''Republican loss'''.

|-
! {{Ushr|Indiana|11|X}}
| [[Andrew Jacobs Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Indiana|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Andrew Jacobs Jr.]]''' (Democratic) 55.7%
* {{Party stripe|Republican Party (US)}}Paul R. Oakes (Republican) 44.3%
}}

|}

== Iowa ==
<!--{{Main|1966 United States House of Representatives elections in Iowa}}-->
{{See also|List of United States representatives from Iowa}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Iowa|1|X}}
| [[John R. Schmidhauser]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Iowa|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Fred Schwengel]]''' (Republican) 51.3%
* {{Party stripe|Democratic Party (US)}}[[John R. Schmidhauser]] (Democratic) 47.9%
* {{Party stripe|Constitution Party (US)}}Merle M. Thayer (American Constitution) 0.8%
}}

|-
! {{Ushr|Iowa|2|X}}
| [[John Culver]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Iowa|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John Culver]]''' (Democratic) 54.0%
* {{Party stripe|Republican Party (US)}}[[Robert M. L. Johnson]] (Republican) 46.0%
}}

|-
! {{Ushr|Iowa|3|X}}
| [[H. R. Gross]]
| {{Party shading/Republican}} | Republican
| [[1948 United States House of Representatives elections in Iowa|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[H. R. Gross]]''' (Republican) 62.0%
* {{Party stripe|Democratic Party (US)}}L. A. Pat Touchae (Democratic) 38.0%
}}

|-
! {{Ushr|Iowa|4|X}}
| [[Bert Bandstra]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Iowa|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John Henry Kyl]]''' (Republican) 51.7%
* {{Party stripe|Democratic Party (US)}}[[Bert Bandstra]] (Democratic) 48.3%
}}

|-
! {{Ushr|Iowa|5|X}}
| [[Neal Smith (politician)|Neal Smith]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Iowa|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Neal Smith (politician)|Neal Smith]]''' (Democratic) 60.4%
* {{Party stripe|Republican Party (US)}}Don Mahon (Republican) 39.0%
* {{Party stripe|Constitution Party (US)}}Robbins Risher (American Constitution) 0.6%
}}

|-
! {{Ushr|Iowa|6|X}}
| [[Stanley L. Greigg]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Iowa|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Wiley Mayne]]''' (Republican) 57.4%
* {{Party stripe|Democratic Party (US)}}[[Stanley L. Greigg]] (Democratic) 42.3%
* {{Party stripe|Constitution Party (US)}}Lee E. Smith (American Constitution) 0.3%
}}

|-
! {{Ushr|Iowa|7|X}}
| [[John R. Hansen]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Iowa|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William J. Scherle]]''' (Republican) 59.0%
* {{Party stripe|Democratic Party (US)}}[[John R. Hansen]] (Democratic) 40.9%
* {{Party stripe|Constitution Party (US)}}Gordon Risher (American Constitution) 0.1%
}}

|}

== Kansas ==
<!--{{Main|1966 United States House of Representatives elections in Kansas}}-->
{{See also|List of United States representatives from Kansas}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Kansas|1|X}}
| [[Bob Dole]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Kansas|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Bob Dole]]''' (Republican) 68.6%
* {{Party stripe|Democratic Party (US)}}Berniece Henkle (Democratic) 31.4%
}}

|-
! {{Ushr|Kansas|2|X}}
| [[Chester L. Mize]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Kansas|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Chester L. Mize]]''' (Republican) 62.8%
* {{Party stripe|Democratic Party (US)}}Harry G. Wiles (Democratic) 37.2%
}}

|-
! {{Ushr|Kansas|3|X}}
| [[Robert Ellsworth]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Kansas|1960]]
| {{Party shading/Republican/Hold}} | Incumbent retired to [[1966 United States Senate election in Kansas|run for U.S. senator]].<br/>Republican hold.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Larry Winn]]''' (Republican) 52.9%
* {{Party stripe|Democratic Party (US)}}Marvin E. Rainey (Democratic) 45.0%
* {{Party stripe|Conservative Party (US)}}Harold H. Shomber (Conservative) 2.1%
}}

|-
! {{Ushr|Kansas|4|X}}
| [[Garner E. Shriver]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Kansas|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Garner E. Shriver]]''' (Republican) 68.7%
* {{Party stripe|Democratic Party (US)}}Paul H. Gerling (Democratic) 31.3%
}}

|-
! {{Ushr|Kansas|5|X}}
| [[Joe Skubitz]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in Kansas|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Joe Skubitz]]''' (Republican) 60.9%
* {{Party stripe|Democratic Party (US)}}Delno L. Bass (Democratic) 39.1%
}}

|}

== Kentucky ==
<!--{{Main|1966 United States House of Representatives elections in Kentucky}}-->
{{See also|List of United States representatives from Kentucky}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Kentucky|1|X}}
| [[Frank Stubblefield]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Kentucky|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Frank Stubblefield]]''' (Democratic) 70.6%
* {{Party stripe|Republican Party (US)}}Richard Nicholson (Republican) 29.4%
}}

|-
! {{Ushr|Kentucky|2|X}}
| [[William Natcher]]
| {{Party shading/Democratic}} | Democratic
| [[1953 Kentucky's 2nd congressional district special election|1953 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William Natcher]]''' (Democratic) 58.9%
* {{Party stripe|Republican Party (US)}}R. Douglas Ford (Republican) 41.1%
}}

|-
! {{Ushr|Kentucky|3|X}}
| [[Charles R. Farnsley]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Kentucky|1964]]
| {{Party shading/Republican}} | Incumbent retired.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William Cowger]]''' (Republican) 59.0%
* {{Party stripe|Democratic Party (US)}}Norbert Blume (Democratic) 41.0%
}}

|-
! {{Ushr|Kentucky|4|X}}
| [[Frank Chelf]]
| {{Party shading/Democratic}} | Democratic
| [[1944 United States House of Representatives elections in Kentucky|1944]]
| {{Party shading/Republican}} | Incumbent retired, but replaced John Moloney on the ballot after he died 2 days before the election.<br/>Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Gene Snyder]]''' (Republican) 53.9%
* {{Party stripe|Democratic Party (US)}}[[Frank Chelf]] (Democratic) 45.9%
* {{Party stripe|Write-in}}John J. Moloney ([[Write-in candidate|write-in]]) 0.1%
}}

|-
! {{Ushr|Kentucky|5|X}}
| [[Tim Lee Carter]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Kentucky|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Tim Lee Carter]]''' (Republican) 75.4%
* {{Party stripe|Democratic Party (US)}}Eugene C. Harter Jr. (Democratic) 24.6%
}}

|-
! {{Ushr|Kentucky|6|X}}
| [[John C. Watts]]
| {{Party shading/Democratic}} | Democratic
| [[1951 Kentucky's 6th congressional district special election|1951 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John C. Watts]]''' (Democratic) 65.0%
* {{Party stripe|Republican Party (US)}}William Hendren (Republican) 35.0%
}}

|-
! {{Ushr|Kentucky|7|X}}
| [[Carl D. Perkins]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in Kentucky|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Carl D. Perkins]]''' (Democratic) 68.9%
* {{Party stripe|Republican Party (US)}}C. F. See (Republican) 31.1%
}}

|}

== Louisiana ==
<!--{{Main|1966 United States House of Representatives elections in Louisiana}}-->
{{See also|List of United States representatives from Louisiana}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Louisiana|1|X}}
| [[F. Edward Hébert]]
| {{Party shading/Democratic}} | Democratic
| [[1940 United States House of Representatives elections in Louisiana|1940]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[F. Edward Hébert]]''' (Democratic) ''Unopposed''
}}

|-
! {{Ushr|Louisiana|2|X}}
| [[Hale Boggs]]
| {{Party shading/Democratic}} | Democratic
| [[1940 United States House of Representatives elections in Louisiana|1940]]<br/>1942 {{Small|(lost)}}<br/>[[1946 United States House of Representatives elections in Louisiana|1946]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Hale Boggs]]''' (Democratic) 68.6%
* {{Party stripe|Republican Party (US)}}Leonard L. Limes (Republican) 31.4%
}}

|-
! {{Ushr|Louisiana|3|X}}
| [[Edwin E. Willis]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in Louisiana|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Edwin E. Willis]]''' (Democratic) 59.7%
* {{Party stripe|Republican Party (US)}}Hall Lyons (Republican) 40.3%
}}

|-
! {{Ushr|Louisiana|4|X}}
| [[Joe Waggonner]]
| {{Party shading/Democratic}} | Democratic
| [[1961 United States House of Representatives elections|1961 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Joe Waggonner]]''' (Democratic) ''Unopposed''
}}

|-
! {{Ushr|Louisiana|5|X}}
| [[Otto Passman]]
| {{Party shading/Democratic}} | Democratic
| [[1946 United States House of Representatives elections in Louisiana|1946]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Otto Passman]]''' (Democratic) ''Unopposed''
}}

|-
! {{Ushr|Louisiana|6|X}}
| [[James H. Morrison]]
| {{Party shading/Democratic}} | Democratic
| [[1942 United States House of Representatives elections in Louisiana|1942]]
| {{Party shading/Democratic/Hold}} | Incumbent lost renomination.<br/>Democratic hold.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John Rarick]]''' (Democratic) 76.6%
* {{Party stripe|Republican Party (US)}}Crayton G. Hall (Republican) 23.4%
}}

|-
! {{Ushr|Louisiana|7|X}}
| [[Edwin Edwards]]
| {{Party shading/Democratic}} | Democratic
| [[1965 United States House of Representatives elections|1965 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Edwin Edwards]]''' (Democratic) ''Unopposed''
}}

|-
! {{Ushr|Louisiana|8|X}}
| [[Speedy Long]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Louisiana|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Speedy Long]]''' (Democratic) ''Unopposed''
}}

|}

== Maine ==
<!--{{Main|1966 United States House of Representatives elections in Maine}}-->
{{See also|List of United States representatives from Maine}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Maine|1|X}}
| [[Stanley R. Tupper]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Maine|1960]]
| {{Party shading/Democratic}} | Incumbent retired.<br/>'''Democratic gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Peter Kyros]]''' (Democratic) 50.4%
* {{Party stripe|Republican Party (US)}}[[Peter A. Garland]] (Republican) 45.2%
* {{Party stripe|Independent}}Thomas L. Maynard (Independent) 4.4%
}}

|-
! {{Ushr|Maine|2|X}}
| [[William Hathaway]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Maine|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William Hathaway]]''' (Democratic) 56.8%
* {{Party stripe|Republican Party (US)}}Howard M. Foley (Republican) 43.2%
}}

|}

== Maryland ==
{{Main|1966 United States House of Representatives elections in Maryland}}
{{See also|List of United States representatives from Maryland}}

Maryland redistricted its at-large district into an 8th district around Montgomery County, managing to adjust boundaries so no existing incumbents were displaced.<ref name="martis" />

{{USCongressElectionTableHead}}

|-
! {{Ushr|Maryland|1|X}}
| [[Rogers Morton]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in Maryland|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Rogers Morton]]''' (Republican) 71.4%
* {{Party stripe|Democratic Party (US)}}[[Curley Byrd|Harry C. Byrd]] (Democratic) 28.6%
}}

|-
! {{Ushr|Maryland|2|X}}
| [[Clarence Long]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Maryland|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Clarence Long]]''' (Democratic) 69.3%
* {{Party stripe|Republican Party (US)}}Paul T. McHenry Jr. (Republican) 30.7%
}}

|-
! {{Ushr|Maryland|3|X}}
| [[Edward Garmatz]]
| {{Party shading/Democratic}} | Democratic
| [[1947 United States House of Representatives elections|1947 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Edward Garmatz]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Maryland|4|X}}
| [[George Hyde Fallon]]
| {{Party shading/Democratic}} | Democratic
| [[1944 United States House of Representatives elections in Maryland|1944]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[George Hyde Fallon]]''' (Democratic) 74.3%
* {{Party stripe|Republican Party (US)}}G. Neilson Sigler (Republican) 25.7%
}}

|-
! {{Ushr|Maryland|5|X}}
| [[Hervey Machen]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Maryland|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Hervey Machen]]''' (Democratic) 53.9%
* {{Party stripe|Republican Party (US)}}[[Lawrence Hogan]] (Republican) 46.1%
}}

|-
! {{Ushr|Maryland|6|X}}
| [[Charles Mathias]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Maryland|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Charles Mathias]]''' (Republican) 70.9%
* {{Party stripe|Democratic Party (US)}}Walter G. Finch (Democratic) 29.1%
}}

|-
! {{Ushr|Maryland|7|X}}
| [[Samuel Friedel]]
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in Maryland|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Samuel Friedel]]''' (Democratic) 76.0%
* {{Party stripe|Republican Party (US)}}Stephen L. Rosenstein (Republican) 24.0%
}}

|-
! {{Ushr|Maryland|8|X}}
| [[Carlton R. Sickles]]<br/>{{Small|Redistricted from the {{Ushr|MD|AL|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Maryland|1962]]
| {{Party shading/Republican}} | Incumbent retired to [[1966 Maryland gubernatorial election|run for governor]].<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Gilbert Gude]]''' (Republican) 54.4%
* {{Party stripe|Democratic Party (US)}}Royce Hanson (Democratic) 45.6%
}}

|}

== Massachusetts ==
<!--{{Main|1966 United States House of Representatives elections in Massachusetts}}-->
{{See also|List of United States representatives from Massachusetts}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Massachusetts|1|X}}
| [[Silvio O. Conte]]
| {{Party shading/Republican}} | Republican
| [[1958 United States House of Representatives elections in Massachusetts|1958]]
| Incumbent re-elected.
| nowrap |  {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Silvio O. Conte]]''' (Republican) ''Unopposed''

|-
! {{Ushr|Massachusetts|2|X}}
| [[Edward Boland]]
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in Massachusetts|1952]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Edward Boland]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Massachusetts|3|X}}
| [[Philip J. Philbin]]
| {{Party shading/Democratic}} | Democratic
| [[1942 United States House of Representatives elections in Massachusetts|1942]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Philip J. Philbin]]''' (Democratic) 71.0%
* {{Party stripe|Republican Party (US)}}Howard A. Miller Jr. (Republican) 29.0%
}}

|-
! {{Ushr|Massachusetts|4|X}}
| [[Harold Donohue]]
| {{Party shading/Democratic}} | Democratic
| [[1946 United States House of Representatives elections in Massachusetts|1946]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Harold Donohue]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Massachusetts|5|X}}
| [[F. Bradford Morse]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Massachusetts|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[F. Bradford Morse]]''' (Republican) 74.8%
* {{Party stripe|Democratic Party (US)}}Charles N. Tsapatsaris (Democratic) 25.2%
}}

|-
! {{Ushr|Massachusetts|6|X}}
| [[William H. Bates]]
| {{Party shading/Republican}} | Republican
| [[1950 United States House of Representatives elections in Massachusetts|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William H. Bates]]''' (Republican) 65.7%
* {{Party stripe|Democratic Party (US)}}Daniel L. Parent (Democratic) 34.3%
}}

|-
! {{Ushr|Massachusetts|7|X}}
| [[Torbert Macdonald]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Massachusetts|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Torbert Macdonald]]''' (Democratic) 74.5%
* {{Party stripe|Republican Party (US)}}Gordon F. Hughes (Republican) 25.5%
}}

|-
! {{Ushr|Massachusetts|8|X}}
| [[Tip O'Neill]]
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in Massachusetts|1952]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Tip O'Neill]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Massachusetts|9|X}}
| [[John W. McCormack]]
| {{Party shading/Democratic}} | Democratic
| [[1928 United States House of Representatives elections in Massachusetts|1928]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John W. McCormack]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Massachusetts|10|X}}
| [[Joseph W. Martin Jr.]]
| {{Party shading/Republican}} | Republican
| [[1924 United States House of Representatives elections in Massachusetts|1924]]
| {{Party shading/Republican/Hold}} | Incumbent lost renomination.<br/>Republican hold.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Margaret Heckler]]''' (Republican) 51.1%
* {{Party stripe|Democratic Party (US)}}Patrick H. Harrington Jr. (Democratic) 48.9%
}}

|-
! {{Ushr|Massachusetts|11|X}}
| [[James A. Burke (Massachusetts politician)|James A. Burke]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Massachusetts|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[James A. Burke (Massachusetts politician)|James A. Burke]]''' (Democratic) 74.8%
* {{Party stripe|Republican Party (US)}}James L. Hofford (Republican) 25.2%
}}

|-
! {{Ushr|Massachusetts|12|X}}
| [[Hastings Keith]]
| {{Party shading/Republican}} | Republican
| [[1958 United States House of Representatives elections in Massachusetts|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Hastings Keith]]''' (Republican) 55.0%
* {{Party stripe|Democratic Party (US)}}[[Edward F. Harrington]] (Democratic) 45.0%
}}

|}

== Michigan ==
<!--{{Main|1966 United States House of Representatives elections in Michigan}}-->
{{See also|List of United States representatives from Michigan}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Michigan|1|X}}
| [[John Conyers]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Michigan|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John Conyers]]''' (Democratic) 84.2%
* {{Party stripe|Republican Party (US)}}Rhecha R. Ross (Republican) 15.8%
}}

|-
! {{Ushr|Michigan|2|X}}
| [[Weston E. Vivian]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Michigan|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Marvin L. Esch]]''' (Republican) 51.0%
* {{Party stripe|Democratic Party (US)}}[[Weston E. Vivian]] (Democratic) 49.0%
}}

|-
! {{Ushr|Michigan|3|X}}
| [[Paul H. Todd Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Michigan|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Garry E. Brown]]''' (Republican) 52.2%
* {{Party stripe|Democratic Party (US)}}[[Paul H. Todd Jr.]] (Democratic) 47.8%
}}

|-
! {{Ushr|Michigan|4|X}}
| [[J. Edward Hutchinson]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in Michigan|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[J. Edward Hutchinson]]''' (Republican) 67.8%
* {{Party stripe|Democratic Party (US)}}John V. Martin (Democratic) 32.2%
}}

|-
! {{Ushr|Michigan|5|X}}
| [[Gerald Ford]]
| {{Party shading/Republican}} | Republican
| [[1948 United States House of Representatives elections in Michigan|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Gerald Ford]]''' (Republican) 68.4%
* {{Party stripe|Democratic Party (US)}}James Mathew Catchick (Democratic) 31.6%
}}

|-
! {{Ushr|Michigan|6|X}}
| [[Charles E. Chamberlain]]
| {{Party shading/Republican}} | Republican
| [[1956 United States House of Representatives elections in Michigan|1956]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Charles E. Chamberlain]]''' (Republican) 67.3%
* {{Party stripe|Democratic Party (US)}}Lee H. Wenke (Democratic) 32.7%
}}

|-
! {{Ushr|Michigan|7|X}}
| [[John C. Mackie]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Michigan|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Donald Riegle]]''' (Republican) 54.1%
* {{Party stripe|Democratic Party (US)}}[[John C. Mackie]] (Democratic) 45.9%
}}

|-
! {{Ushr|Michigan|8|X}}
| [[R. James Harvey]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Michigan|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[R. James Harvey]]''' (Republican) 69.9%
* {{Party stripe|Democratic Party (US)}}Wager F. Clunis (Democratic) 30.1%
}}

|-
! {{Ushr|Michigan|9|X}}
| [[Robert P. Griffin]]
| {{Party shading/Republican}} | Republican
| [[1956 United States House of Representatives elections in Michigan|1956]]
| {{Party shading/Republican/Hold}} | Resigned to become [[List of United States Senators from Michigan|U.S. senator]].<br/>Republican hold.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Guy Vander Jagt]]''' (Republican) 66.7%
* {{Party stripe|Democratic Party (US)}}Henry J. Dongvillo (Democratic) 33.3%
}}

|-
! {{Ushr|Michigan|10|X}}
| [[Al Cederberg]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in Michigan|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Al Cederberg]]''' (Republican) 67.4%
* {{Party stripe|Democratic Party (US)}}Hubert C. Evans (Democratic) 32.6%
}}

|-
! {{Ushr|Michigan|11|X}}
| [[Raymond F. Clevenger]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Michigan|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Philip Ruppe]]''' (Republican) 51.8%
* {{Party stripe|Democratic Party (US)}}[[Raymond F. Clevenger]] (Democratic) 48.2%
}}

|-
! {{Ushr|Michigan|12|X}}
| [[James G. O'Hara]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Michigan|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[James G. O'Hara]]''' (Democratic) 65.1%
* {{Party stripe|Republican Party (US)}}Patrick J. Driscoll (Republican) 34.9%
}}

|-
! {{Ushr|Michigan|13|X}}
| [[Charles Diggs]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Michigan|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Charles Diggs]]''' (Democratic) 83.0%
* {{Party stripe|Republican Party (US)}}Frank Daniels (Republican) 17.0%
}}

|-
! {{Ushr|Michigan|14|X}}
| [[Lucien Nedzi]]
| {{Party shading/Democratic}} | Democratic
| [[1961 United States House of Representatives elections|1961 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Lucien Nedzi]]''' (Democratic) 59.7%
* {{Party stripe|Republican Party (US)}}William J. Kennedy (Republican) 40.3%
}}

|-
! {{Ushr|Michigan|15|X}}
| [[William D. Ford]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Michigan|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William D. Ford]]''' (Democratic) 67.8%
* {{Party stripe|Republican Party (US)}}Arpo Yemen (Republican) 32.2%
}}

|-
! {{Ushr|Michigan|16|X}}
| [[John Dingell]]
| {{Party shading/Democratic}} | Democratic
| [[1955 Michigan's 15th congressional district special election|1955 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John Dingell]]''' (Democratic) 62.7%
* {{Party stripe|Republican Party (US)}}John T. Dempsey (Republican) 37.3%
}}

|-
! {{Ushr|Michigan|17|X}}
| [[Martha Griffiths]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Michigan|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Martha Griffiths]]''' (Democratic) 69.2%
* {{Party stripe|Republican Party (US)}}William P. Harrington (Republican) 30.8%
}}

|-
! {{Ushr|Michigan|18|X}}
| [[William Broomfield]]
| {{Party shading/Republican}} | Republican
| [[1956 United States House of Representatives elections in Michigan|1956]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William Broomfield]]''' (Republican) 67.8%
* {{Party stripe|Democratic Party (US)}}William H. Merrill (Democratic) 32.2%
}}

|-
! {{Ushr|Michigan|19|X}}
| [[Billie S. Farnum]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Michigan|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Jack H. McDonald]]''' (Republican) 57.0%
* {{Party stripe|Democratic Party (US)}}[[Billie S. Farnum]] (Democratic) 43.0%
}}

|}

== Minnesota ==
<!--{{Main|1966 United States House of Representatives elections in Minnesota}}-->
{{See also|List of United States representatives from Minnesota}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Minnesota|1|X}}
| [[Al Quie]]
| {{Party shading/Republican}} | Republican
| [[1958 United States House of Representatives elections in Minnesota|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Al Quie]]''' (Republican) 65.9%
* {{Party stripe|Minnesota Democratic–Farmer–Labor Party}}George Daley ([[Minnesota Democratic–Farmer–Labor Party|DFL]]) 34.1%
}}

|-
! {{Ushr|Minnesota|2|X}}
| [[Ancher Nelsen]]
| {{Party shading/Republican}} | Republican
| [[1958 United States House of Representatives elections in Minnesota|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Ancher Nelsen]]''' (Republican) 66.2%
* {{Party stripe|Minnesota Democratic–Farmer–Labor Party}}Charles M. Christensen (DFL) 33.8%
}}

|-
! {{Ushr|Minnesota|3|X}}
| [[Clark MacGregor]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Minnesota|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Clark MacGregor]]''' (Republican) 65.4%
* {{Party stripe|Minnesota Democratic–Farmer–Labor Party}}Elva D. Walker (DFL) 34.6%
}}

|-
! {{Ushr|Minnesota|4|X}}
| [[Joseph Karth]]
| {{Party shading/DFL}} | DFL
| [[1958 United States House of Representatives elections in Minnesota|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Minnesota Democratic–Farmer–Labor Party}}{{Aye}} '''[[Joseph Karth]]''' (DFL) 53.4%
* {{Party stripe|Republican Party (US)}}Stephen Maxwell (Republican) 46.6%
}}

|-
! {{Ushr|Minnesota|5|X}}
| [[Donald M. Fraser]]
| {{Party shading/DFL}} | DFL
| [[1962 United States House of Representatives elections in Minnesota|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Minnesota Democratic–Farmer–Labor Party}}{{Aye}} '''[[Donald M. Fraser]]''' (DFL) 59.7%
* {{Party stripe|Republican Party (US)}}William L. Hathaway (Republican) 40.3%
}}

|-
! {{Ushr|Minnesota|6|X}}
| [[Alec G. Olson]]
| {{Party shading/DFL}} | DFL
| [[1962 United States House of Representatives elections in Minnesota|1962]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John M. Zwach]]''' (Republican) 51.4%
* {{Party stripe|Minnesota Democratic–Farmer–Labor Party}}[[Alec G. Olson]] (DFL) 48.6%
}}

|-
! {{Ushr|Minnesota|7|X}}
| [[Odin Langen]]
| {{Party shading/Republican}} | Republican
| [[1958 United States House of Representatives elections in Minnesota|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Odin Langen]]''' (Republican) 63.2%
* {{Party stripe|Minnesota Democratic–Farmer–Labor Party}}Keith C. Davison (DFL) 36.8%
}}

|-
! {{Ushr|Minnesota|8|X}}
| [[John Blatnik]]
| {{Party shading/DFL}} | DFL
| [[1946 United States House of Representatives elections in Minnesota|1946]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Minnesota Democratic–Farmer–Labor Party}}{{Aye}} '''[[John Blatnik]]''' (DFL) ''Unopposed''

|}

== Mississippi ==
<!--{{Main|1966 United States House of Representatives elections in Mississippi}}-->
{{See also|List of United States representatives from Mississippi}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Mississippi|1|X}}
| [[Thomas Abernethy (politician)|Thomas Abernethy]]
| {{Party shading/Democratic}} | Democratic
| [[1942 United States House of Representatives elections in Mississippi|1942]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Thomas Abernethy (politician)|Thomas Abernethy]]''' (Democratic) 68.8%
* {{Party stripe|Independent}}William Alexander (Independent) 21.3%
* {{Party stripe|Independent}}Dock Drummond (Independent) 9.9%
}}

|-
! {{Ushr|Mississippi|2|X}}
| [[Jamie Whitten]]
| {{Party shading/Democratic}} | Democratic
| [[1941 United States House of Representatives elections|1941 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Jamie Whitten]]''' (Democratic) 83.5%
* {{Party stripe|Republican Party (US)}}[[Seelig Wise]] (Republican) 16.5%
}}

|-
! {{Ushr|Mississippi|3|X}}
| [[John Bell Williams]]
| {{Party shading/Democratic}} | Democratic
| [[1946 United States House of Representatives elections in Mississippi|1946]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John Bell Williams]]''' (Democratic) 82.4%
* {{Party stripe|Independent}}Emma Sanders (Independent) 17.6%
}}

|-
! {{Ushr|Mississippi|4|X}}
| [[Prentiss Walker]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Mississippi|1964]]
| {{Party shading/Democratic}} | Incumbent retired to [[1966 United States Senate election in Mississippi|run for U.S. Senator]].<br/>'''Democratic gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Sonny Montgomery]]''' (Democratic) 65.3%
* {{Party stripe|Republican Party (US)}}[[Lewis McAllister]] (Republican) 32.6%
* {{Party stripe|Independent}}Sterling P. Davis (Independent) 2.2%
}}

|-
! {{Ushr|Mississippi|5|X}}
| [[William M. Colmer]]
| {{Party shading/Democratic}} | Democratic
| [[1932 United States House of Representatives elections in Mississippi|1932]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William M. Colmer]]''' (Democratic) 70.0%
* {{Party stripe|Republican Party (US)}}James M. Moye (Republican) 30.0%
}}

|}

== Missouri ==
<!--{{Main|1966 United States House of Representatives elections in Missouri}}-->
{{See also|List of United States representatives from Missouri}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Missouri|1|X}}
| [[Frank M. Karsten]]
| {{Party shading/Democratic}} | Democratic
| [[1946 United States House of Representatives elections in Missouri|1946]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Frank M. Karsten]]''' (Democratic) 63.9%
* {{Party stripe|Republican Party (US)}}Robert L. Sharp (Republican) 36.1%
}}

|-
! {{Ushr|Missouri|2|X}}
| [[Thomas B. Curtis]]
| {{Party shading/Republican}} | Republican
| [[1950 United States House of Representatives elections in Missouri|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Thomas B. Curtis]]''' (Republican) 66.2%
* {{Party stripe|Democratic Party (US)}}William B. Milius (Democratic) 33.8%
}}

|-
! {{Ushr|Missouri|3|X}}
| [[Leonor Sullivan]]
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in Missouri|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Leonor Sullivan]]''' (Democratic) 71.1%
* {{Party stripe|Republican Party (US)}}Homer McCracken (Republican) 28.9%
}}

|-
! {{Ushr|Missouri|4|X}}
| [[William J. Randall]]
| {{Party shading/Democratic}} | Democratic
| [[1959 United States House of Representatives elections|1959 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William J. Randall]]''' (Democratic) 60.9%
* {{Party stripe|Republican Party (US)}}Forest Nave Jr. (Republican) 39.1%
}}

|-
! {{Ushr|Missouri|5|X}}
| [[Richard W. Bolling]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in Missouri|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Richard W. Bolling]]''' (Democratic) 61.2%
* {{Party stripe|Republican Party (US)}}Willis E. Salyers (Republican) 38.8%
}}

|-
! {{Ushr|Missouri|6|X}}
| [[William R. Hull Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Missouri|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William R. Hull Jr.]]''' (Democratic) 58.0%
* {{Party stripe|Republican Party (US)}}John L. Leims (Republican) 42.0%
}}

|-
! {{Ushr|Missouri|7|X}}
| [[Durward G. Hall]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Missouri|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Durward G. Hall]]''' (Republican) 62.3%
* {{Party stripe|Democratic Party (US)}}Arch M. Skelton (Democratic) 37.7%
}}

|-
! {{Ushr|Missouri|8|X}}
| [[Richard Howard Ichord Jr.|Richard H. Ichord Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in Missouri|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Richard Howard Ichord Jr.|Richard H. Ichord Jr.]]''' (Democratic) 58.1%
* {{Party stripe|Republican Party (US)}}Ben A. Rogers (Republican) 41.9%
}}

|-
! {{Ushr|Missouri|9|X}}
| [[William L. Hungate]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Missouri|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William L. Hungate]]''' (Democratic) 55.3%
* {{Party stripe|Republican Party (US)}}Anthony C. Schroeder (Republican) 44.7%
}}

|-
! {{Ushr|Missouri|10|X}}
| [[Paul C. Jones]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in Missouri|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Paul C. Jones]]''' (Democratic) 61.0%
* {{Party stripe|Republican Party (US)}}William Bruckerhoff (Republican) 39.0%
}}

|}

== Montana ==
<!--{{Main|1966 United States House of Representatives elections in Montana}}-->
{{See also|List of United States representatives from Montana}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Montana|1|X}}
| [[Arnold Olsen]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in Montana|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Arnold Olsen]]''' (Democratic) 50.8%
* {{Party stripe|Republican Party (US)}}Dick Smiley (Republican) 49.2%
}}

|-
! {{Ushr|Montana|2|X}}
| [[James F. Battin]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Montana|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[James F. Battin]]''' (Republican) 60.2%
* {{Party stripe|Democratic Party (US)}}[[John Melcher]] (Democratic) 39.8%
}}

|}

== Nebraska ==
<!--{{Main|1966 United States House of Representatives elections in Nebraska}}-->
{{See also|List of United States representatives from Nebraska}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Nebraska|1|X}}
| [[Clair A. Callan]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Nebraska|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Robert V. Denney]]''' (Republican) 51.2%
* {{Party stripe|Democratic Party (US)}}[[Clair A. Callan]] (Democratic) 48.8%
}}

|-
! {{Ushr|Nebraska|2|X}}
| [[Glenn Cunningham (Nebraska politician)|Glenn Cunningham]]
| {{Party shading/Republican}} | Republican
| [[1956 United States House of Representatives elections in Nebraska|1956]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Glenn Cunningham (Nebraska politician)|Glenn Cunningham]]''' (Republican) 64.2%
* {{Party stripe|Democratic Party (US)}}Richard Fellman (Democratic) 35.8%
}}

|-
! {{Ushr|Nebraska|3|X}}
| [[David Martin (Nebraska politician)|David Martin]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Nebraska|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[David Martin (Nebraska politician)|David Martin]]''' (Republican) 73.0%
* {{Party stripe|Democratic Party (US)}}John Homan (Democratic) 27.0%
}}

|}

== Nevada ==
<!--{{Main|1966 United States House of Representatives election in Nevada}}-->
{{See also|List of United States representatives from Nevada}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Nevada|AL|X}}
| [[Walter S. Baring Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives election in Nevada|1948]]<br/>1952 {{Small|(lost)}}<br/>[[1956 United States House of Representatives election in Nevada|1956]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Walter S. Baring Jr.]]''' (Democratic) 67.6%
* {{Party stripe|Republican Party (US)}}Ralph L. Kraemer (Republican) 32.4%
}}

|}

== New Hampshire ==
<!--{{Main|1966 United States House of Representatives elections in New Hampshire}}-->
{{See also|List of United States representatives from New Hampshire}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|New Hampshire|1|X}}
| [[J. Oliva Huot]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in New Hampshire|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Louis C. Wyman]]''' (Republican) 56.2%
* {{Party stripe|Democratic Party (US)}}[[J. Oliva Huot]] (Democratic) 43.8%
}}

|-
! {{Ushr|New Hampshire|2|X}}
| [[James Colgate Cleveland]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in New Hampshire|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[James Colgate Cleveland]]''' (Republican) 66.8%
* {{Party stripe|Democratic Party (US)}}William H. Barry Jr. (Democratic) 33.2%
}}

|}

== New Jersey ==
<!--{{Main|1966 United States House of Representatives elections in New Jersey}}-->
{{See also|List of United States representatives from New Jersey}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|New Jersey|1|X}}
| colspan=3 | None (district created)
| {{Party shading/Republican}} | New seat.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John E. Hunt]]''' (Republican) 51.3%
* {{Party stripe|Democratic Party (US)}}Michael J. Piarulli (Democratic) 46.2%
* {{Party stripe|Independent}}Elliott G. Heard Jr. (Independent) 1.4%
* {{Party stripe|Conservative Party (US)}}Joseph V. Hayden (Conservative) 0.7%
* {{Party stripe|Socialist Labor Party (US)}}Dominic W. Doganiero ([[Socialist Labor Party of America|Socialist Labor]]) 0.1%
* {{Party stripe|Independent}}Frederick L. Compton (Peace Equal Rights) 0.1%
}}

|-
! {{Ushr|New Jersey|2|X}}
| [[Thomas C. McGrath Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in New Jersey|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Charles W. Sandman Jr.]]''' (Republican) 51.5%
* {{Party stripe|Democratic Party (US)}}[[Thomas C. McGrath Jr.]] (Democratic) 46.9%
* {{Party stripe|Socialist Labor Party (US)}}Albert Ronis (Socialist Labor) 0.9%
* {{Party stripe|Conservative Party (US)}}Lindwood W. Erickson Jr. (Conservative) 0.7%
}}

|-
! {{Ushr|New Jersey|3|X}}
| [[James J. Howard]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in New Jersey|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[James J. Howard]]''' (Democratic) 52.7%
* {{Party stripe|Republican Party (US)}}[[James M. Coleman]] (Republican) 46.6%
* {{Party stripe|Independent}}Martin A. Watkins (Peace Equal Rights) 0.7%
}}

|-
! {{Ushr|New Jersey|4|X}}
| [[Frank Thompson]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in New Jersey|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Frank Thompson]]''' (Democratic) 56.2%
* {{Party stripe|Republican Party (US)}}Ralph Clark Chandler (Republican) 43.5%
* {{Party stripe|Socialist Labor Party (US)}}Joseph J. Frank (Socialist Labor) 0.3%
}}

|-
! {{Ushr|New Jersey|5|X}}
| [[Peter Frelinghuysen Jr.]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in New Jersey|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Peter Frelinghuysen Jr.]]''' (Republican) 70.8%
* {{Party stripe|Democratic Party (US)}}Carter Jefferson (Democratic) 27.1%
* {{Party stripe|Conservative Party (US)}}Robert G. Wright (Conservative) 2.2%
}}

|-
! {{Ushr|New Jersey|6|X}}
| [[William T. Cahill]]<br/>{{Small|Redistricted from the {{Ushr|NJ|1|C}}}}
| {{Party shading/Republican}} | Republican
| [[1958 United States House of Representatives elections in New Jersey|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William T. Cahill]]''' (Republican) 66.9%
* {{Party stripe|Democratic Party (US)}}Walter Dubrow (Democratic) 30.7%
* {{Party stripe|Conservative Party (US)}}Malcolm C. McWeeney (Conservative) 1.8%
* {{Party stripe|Independent}}Nathan Robinson (Peace Equal Rights) 0.5%
* {{Party stripe|Socialist Labor Party (US)}}Bernardo S. Doganiero (Socialist Labor) 0.2%
}}

|-
! {{Ushr|New Jersey|7|X}}
| [[William B. Widnall]]
| {{Party shading/Republican}} | Republican
| [[1950 United States House of Representatives elections in New Jersey|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William B. Widnall]]''' (Republican) 66.4%
* {{Party stripe|Democratic Party (US)}}Robert E. Hamer (Democratic) 33.6%
}}

|-
! {{Ushr|New Jersey|8|X}}
| [[Charles S. Joelson]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in New Jersey|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Charles S. Joelson]]''' (Democratic) 59.6%
* {{Party stripe|Republican Party (US)}}Richard M. DeMarco (Republican) 38.2%
* {{Party stripe|Socialist Labor Party (US)}}Harry Santhouse (Socialist Labor) 2.2%
}}

|-
! {{Ushr|New Jersey|9|X}}
| [[Henry Helstoski]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in New Jersey|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Henry Helstoski]]''' (Democratic) 50.9%
* {{Party stripe|Republican Party (US)}}[[Frank C. Osmers Jr.]] (Republican) 49.1%
}}

|-
! {{Ushr|New Jersey|10|X}}
| [[Peter W. Rodino]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in New Jersey|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Peter W. Rodino]]''' (Democratic) 64.3%
* {{Party stripe|Republican Party (US)}}Earl Harris (Republican) 32.7%
* {{Party stripe|Conservative Party (US)}}Virginia Elliott (Conservative) 2.4%
* {{Party stripe|Socialist Labor Party (US)}}Harry Press (Socialist Labor) 0.6%
}}

|-
! {{Ushr|New Jersey|11|X}}
| [[Joseph Minish]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in New Jersey|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Joseph Minish]]''' (Democratic) 58.3%
* {{Party stripe|Republican Party (US)}}Leonard J. Felzenberg (Republican) 40.8%
* {{Party stripe|Socialist Labor Party (US)}}Joseph Carroll (Socialist Labor) 0.9%
}}

|-
! rowspan=2 | {{Ushr|New Jersey|12|X}}
| [[Florence P. Dwyer]]<br/>{{Small|Redistricted from the {{Ushr|NJ|6|C}}}}
| {{Party shading/Republican}} | Republican
| [[1956 United States House of Representatives elections in New Jersey|1956]]
| Incumbent re-elected.
| rowspan=2 nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Florence P. Dwyer]]''' (Republican) 73.9%
* {{Party stripe|Democratic Party (US)}}Robert F. Allen (Democratic) 23.9%
* {{Party stripe|Conservative Party (US)}}Howard Shershinger (Conservative) 2.1%
}}

|-
| [[Paul J. Krebs]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in New Jersey|1964]]
| {{Party shading/Loss}} | Incumbent retired.<br/>'''Democratic loss'''.

|-
! {{Ushr|New Jersey|13|X}}
| [[Neil Gallagher (American politician)|Neil Gallagher]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in New Jersey|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Neil Gallagher (American politician)|Neil Gallagher]]''' (Democratic) 71.8%
* {{Party stripe|Republican Party (US)}}Ruth Swayze (Republican) 28.2%
}}

|-
! {{Ushr|New Jersey|14|X}}
| [[Dominick V. Daniels]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in New Jersey|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Dominick V. Daniels]]''' (Democratic) 68.0%
* {{Party stripe|Republican Party (US)}}Thomas R. McSherry (Republican) 28.5%
* {{Party stripe|Conservative Party (US)}}Benjamin J. Messina (Conservative) 3.5%
}}

|-
! {{Ushr|New Jersey|15|X}}
| [[Edward J. Patten]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in New Jersey|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Edward J. Patten]]''' (Democratic) 57.0%
* {{Party stripe|Republican Party (US)}}C. John Stroumtsos (Republican) 41.5%
* {{Party stripe|Conservative Party (US)}}Albert Wasilewski (Conservative) 1.6%
}}

|}

== New Mexico ==
{{Main|1966 United States House of Representatives election in New Mexico}}
{{See also|List of United States representatives from New Mexico}}

{{USCongressElectionTableHead}}

|-
! rowspan=2 | {{Ushr|New Mexico|AL|X}}
| [[Thomas G. Morris]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives election in New Mexico|1958]]
| Incumbent re-elected.
| rowspan=2 nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Thomas G. Morris]]''' (Democratic) 27.9%
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[E. S. Johnny Walker]]''' (Democratic) 25.3%
* {{Party stripe|Republican Party (US)}}Robert C. Davidson (Republican) 24.8%
* {{Party stripe|Republican Party (US)}}Schuble C. Cook (Republican) 22.0%
}}

|-
| [[E. S. Johnny Walker]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives election in New Mexico|1964]]
| Incumbent re-elected.

|}

== New York ==
<!--{{Main|1966 United States House of Representatives elections in New York}}-->
{{See also|List of United States representatives from New York}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|New York|1|X}}
| [[Otis G. Pike]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in New York|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Otis G. Pike]]''' (Democratic) 58.9%
* {{Party stripe|Republican Party (US)}}James M. Catterson Jr. (Republican) 33.7%
* {{Party stripe|Conservative Party (US)}}Domenico Crachi Jr. (Conservative) 7.4%
}}

|-
! {{Ushr|New York|2|X}}
| [[James R. Grover Jr.]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in New York|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[James R. Grover Jr.]]''' (Republican) 54.7%
* {{Party stripe|Democratic Party (US)}}Frank M. Corso (Democratic) 34.1%
* {{Party stripe|Conservative Party (US)}}Edward Campbell (Conservative) 10.2%
* {{Party stripe|Independent}}John Brush (Peace) 1.0%
}}

|-
! {{Ushr|New York|3|X}}
| [[Lester L. Wolff]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in New York|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Lester L. Wolff]]''' (Democratic) 50.3%
* {{Party stripe|Republican Party (US)}}[[Steven Derounian]] (Republican) 49.7%
}}

|-
! {{Ushr|New York|4|X}}
| [[John W. Wydler]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in New York|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John W. Wydler]]''' (Republican) 59.7%
* {{Party stripe|Democratic Party (US)}}Martin Steadman (Democratic) 32.0%
* {{Party stripe|Conservative Party (US)}}Donald H. Serrell (Conservative) 6.9%
* {{Party stripe|Independent}}Bernard Kagel (Peace) 1.4%
}}

|-
! {{Ushr|New York|5|X}}
| [[Herbert Tenzer]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in New York|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Herbert Tenzer]]''' (Democratic) 49.9%
* {{Party stripe|Republican Party (US)}}Thomas Brennan (Republican) 48.6%
* {{Party stripe|Independent}}Carleton M. Fisher (Peace) 1.5%
}}

|-
! {{Ushr|New York|6|X}}
| [[Seymour Halpern]]
| {{Party shading/Republican}} | Republican
| [[1958 United States House of Representatives elections in New York|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Seymour Halpern]]''' (Republican) 59.0%
* {{Party stripe|Democratic Party (US)}}Gilbert T. Redleaf (Democratic) 29.4%
* {{Party stripe|Conservative Party (US)}}Ronald E. Weiss (Conservative) 11.5%
}}

|-
! {{Ushr|New York|7|X}}
| [[Joseph P. Addabbo]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in New York|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Joseph P. Addabbo]]''' (Democratic) 64.9%
* {{Party stripe|Republican Party (US)}}Louis R. Mercogliano (Republican) 24.0%
* {{Party stripe|Conservative Party (US)}}Raymond G. Carpenter (Conservative) 11.1%
}}

|-
! {{Ushr|New York|8|X}}
| [[Benjamin Rosenthal]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in New York|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Benjamin Rosenthal]]''' (Democratic) 69.6%
* {{Party stripe|Republican Party (US)}}Thomas C. Gowlan (Republican) 22.1%
* {{Party stripe|Conservative Party (US)}}Cyrus Julien (Conservative) 8.3%
}}

|-
! {{Ushr|New York|9|X}}
| [[James J. Delaney]]
| {{Party shading/Democratic}} | Democratic
| [[1944 United States House of Representatives elections in New York|1944]]<br/>1946 {{Small|(lost)}}<br/>[[1948 United States House of Representatives elections in New York|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[James J. Delaney]]''' (Democratic) 53.5%
* {{Party stripe|Republican Party (US)}}John F. Haggerty (Republican) 40.0%
* {{Party stripe|Liberal Party of New York}}David Green ([[Liberal Party of New York|Liberal]]) 6.5%
}}

|-
! {{Ushr|New York|10|X}}
| [[Emanuel Celler]]
| {{Party shading/Democratic}} | Democratic
| [[1922 United States House of Representatives elections in New York|1922]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Emanuel Celler]]''' (Democratic) 82.1%
* {{Party stripe|Republican Party (US)}}Erwin A. Rosenberg (Republican) 17.9%
}}

|-
! {{Ushr|New York|11|X}}
| [[Eugene Keogh]]
| {{Party shading/Democratic}} | Democratic
| [[1936 United States House of Representatives elections in New York|1936]]
| {{Party shading/Democratic/Hold}} | Incumbent retired.<br/>Democratic hold.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Frank J. Brasco]]''' (Democratic) 70.6%
* {{Party stripe|Republican Party (US)}}Benjamin W. Feldman (Republican) 21.9%
* {{Party stripe|Liberal Party of New York}}Edward L. Johnson (Liberal) 7.5%
}}

|-
! {{Ushr|New York|12|X}}
| [[Edna F. Kelly]]
| {{Party shading/Democratic}} | Democratic
| [[1949 United States House of Representatives elections|1949 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Edna F. Kelly]]''' (Democratic) 72.7%
* {{Party stripe|Republican Party (US)}}Alfred G. Walton (Republican) 24.4%
* {{Party stripe|Peace and Freedom Party (US)}}[[Herbert Aptheker]] (Peace and Freedom) 3.0%
}}

|-
! {{Ushr|New York|13|X}}
| [[Abraham J. Multer]]
| {{Party shading/Democratic}} | Democratic
| [[1947 United States House of Representatives elections|1947 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Abraham J. Multer]]''' (Democratic) 61.9%
* {{Party stripe|Republican Party (US)}}Mary Gravina (Republican) 18.6%
* {{Party stripe|Liberal Party of New York}}Hershell Chanin (Liberal) 13.3%
* {{Party stripe|Conservative Party (US)}}Michael J. Spadaro (Conservative) 6.1%
}}

|-
! {{Ushr|New York|14|X}}
| [[John J. Rooney (politician)|John J. Rooney]]
| {{Party shading/Democratic}} | Democratic
| [[1944 United States House of Representatives elections in New York|1944]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John J. Rooney (politician)|John J. Rooney]]''' (Democratic) 77.6%
* {{Party stripe|Republican Party (US)}}Leon F. Nadrowski (Republican) 22.4%
}}

|-
! {{Ushr|New York|15|X}}
| [[Hugh Carey]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in New York|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Hugh Carey]]''' (Democratic) 56.8%
* {{Party stripe|Republican Party (US)}}Herbert F. Ryan (Republican) 43.2%
}}

|-
! {{Ushr|New York|16|X}}
| [[John M. Murphy (New York politician)|John M. Murphy]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in New York|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John M. Murphy (New York politician)|John M. Murphy]]''' (Democratic) 57.4%
* {{Party stripe|Republican Party (US)}}Frank J. Biondolillo (Republican) 42.6%
}}

|-
! {{Ushr|New York|17|X}}
| [[Theodore R. Kupferman]]
| {{Party shading/Republican}} | Republican
| [[#Special elections|1966 <small>(special)</small>]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Theodore R. Kupferman]]''' (Republican) 47.7%
* {{Party stripe|Democratic Party (US)}}[[Jerome L. Wilson]] (Democratic) 46.2%
* {{Party stripe|Conservative Party (US)}}Richard J. Callahan (Conservative) 6.1%
}}

|-
! {{Ushr|New York|18|X}}
| [[Adam Clayton Powell Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1944 United States House of Representatives elections in New York|1944]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Adam Clayton Powell Jr.]]''' (Democratic) 74.0%
* {{Party stripe|Republican Party (US)}}Lassen R. Walsh (Republican) 17.5%
* {{Party stripe|Liberal Party of New York}}Richard Priedeaux (Liberal) 6.5%
* {{Party stripe|Conservative Party (US)}}Ryland E. D. Chase (Conservative) 2.0%
}}

|-
! {{Ushr|New York|19|X}}
| [[Leonard Farbstein]]
| {{Party shading/Democratic}} | Democratic
| [[1956 United States House of Representatives elections in New York|1956]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Leonard Farbstein]]''' (Democratic) 57.8%
* {{Party stripe|Republican Party (US)}}Henry E. Del Rosso (Republican) 26.2%
* {{Party stripe|Liberal Party of New York}}Elaine M. Morrison (Liberal) 12.2%
* {{Party stripe|Socialist Party of America}}[[James Weinstein (author)|James Weinstein]] ([[Socialist Party of America|Socialist]]) 3.8%
}}

|-
! {{Ushr|New York|20|X}}
| [[William Fitts Ryan]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in New York|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William Fitts Ryan]]''' (Democratic) 74.8%
* {{Party stripe|Republican Party (US)}}Norman C. Harlowe (Republican) 20.7%
* {{Party stripe|Conservative Party (US)}}Carolyn S. Weller (Conservative) 4.5%
}}

|-
! {{Ushr|New York|21|X}}
| [[James H. Scheuer]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in New York|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[James H. Scheuer]]''' (Democratic) 83.6%
* {{Party stripe|Republican Party (US)}}Burton Siegel (Republican) 16.4%
}}

|-
! {{Ushr|New York|22|X}}
| [[Jacob H. Gilbert]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in New York|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Jacob H. Gilbert]]''' (Democratic) 74.2%
* {{Party stripe|Republican Party (US)}}Pedro Luis Rodriguez (Republican) 19.3%
* {{Party stripe|Liberal Party of New York}}Carlos Rosario (Liberal) 6.5%
}}

|-
! {{Ushr|New York|23|X}}
| [[Jonathan B. Bingham]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in New York|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Jonathan B. Bingham]]''' (Democratic) 73.4%
* {{Party stripe|Republican Party (US)}}Harold Grosberg (Republican) 18.9%
* {{Party stripe|Conservative Party (US)}}Walter A. Quinn Jr. (Conservative) 7.8%
}}

|-
! {{Ushr|New York|24|X}}
| [[Paul A. Fino]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in New York|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Paul A. Fino]]''' (Republican) 63.9%
* {{Party stripe|Democratic Party (US)}}[[Aileen B. Ryan]] (Democratic) 33.4%
* {{Party stripe|Liberal Party of New York}}John P. Hagan (Liberal) 2.7%
}}

|-
! {{Ushr|New York|25|X}}
| [[Richard Ottinger]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in New York|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Richard Ottinger]]''' (Democratic) 54.6%
* {{Party stripe|Republican Party (US)}}Frederick J. Martin Jr. (Republican) 45.4%
}}

|-
! {{Ushr|New York|26|X}}
| [[Ogden Reid|Ogden R. Reid]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in New York|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Ogden Reid|Ogden R. Reid]]''' (Republican) 69.3%
* {{Party stripe|Democratic Party (US)}}Joseph L. Hutner (Democratic) 25.4%
* {{Party stripe|Conservative Party (US)}}Albert M. Gants (Conservative) 5.3%
}}

|-
! {{Ushr|New York|27|X}}
| [[John G. Dow]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in New York|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John G. Dow]]''' (Democratic) 47.2%
* {{Party stripe|Republican Party (US)}}Louis V. Mills (Republican) 44.5%
* {{Party stripe|Conservative Party (US)}}Frederick P. Roland (Conservative) 8.3%
}}

|-
! {{Ushr|New York|28|X}}
| [[Joseph Y. Resnick]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in New York|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Joseph Y. Resnick]]''' (Democratic) 50.3%
* {{Party stripe|Republican Party (US)}}[[Hamilton Fish IV]] (Republican) 46.3%
* {{Party stripe|Conservative Party (US)}}Jean Hervey (Conservative) 2.1%
* {{Party stripe|Independent}}Eric Lindbloom (Peace) 1.3%
}}

|-
! {{Ushr|New York|29|X}}
| [[Leo W. O'Brien]]
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in New York|1952]]
| {{Party shading/Republican}} | Incumbent retired.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Daniel E. Button]]''' (Republican) 53.3%
* {{Party stripe|Democratic Party (US)}}Richard J. Connors (Democratic) 45.1%
* {{Party stripe|Conservative Party (US)}}John Muller (Conservative) 1.6%
}}

|-
! {{Ushr|New York|30|X}}
| [[Carleton J. King]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in New York|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Carleton J. King]]''' (Republican) 65.0%
* {{Party stripe|Democratic Party (US)}}John S. Hall (Democratic) 35.0%
}}

|-
! {{Ushr|New York|31|X}}
| [[Robert C. McEwen]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in New York|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Robert C. McEwen]]''' (Republican) 67.6%
* {{Party stripe|Democratic Party (US)}}Raymond E. Bishop (Democratic) 32.4%
}}

|-
! {{Ushr|New York|32|X}}
| [[Alexander Pirnie]]
| {{Party shading/Republican}} | Republican
| [[1958 United States House of Representatives elections in New York|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Alexander Pirnie]]''' (Republican) 72.3%
* {{Party stripe|Democratic Party (US)}}Robert Castle (Democratic) 27.7%
}}

|-
! {{Ushr|New York|33|X}}
| [[Howard W. Robison]]
| {{Party shading/Republican}} | Republican
| [[1958 United States House of Representatives elections in New York|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Howard W. Robison]]''' (Republican) 65.7%
* {{Party stripe|Democratic Party (US)}}Blair G. Ewing (Democratic) 34.0%
* {{Party stripe|Write-in}}Joe Griffith ([[Write-in candidate|write-in]]) 0.3%
}}

|-
! {{Ushr|New York|34|X}}
| [[James M. Hanley]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in New York|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[James M. Hanley]]''' (Democratic) 55.1%
* {{Party stripe|Republican Party (US)}}[[Stewart F. Hancock Jr.]] (Republican) 38.3%
* {{Party stripe|Conservative Party (US)}}Benjamin K. Souler (Conservative) 3.6%
* {{Party stripe|Liberal Party of New York}}Norman Balabanian (Liberal) 3.0%
}}

|-
! {{Ushr|New York|35|X}}
| [[Samuel S. Stratton]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in New York|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Samuel S. Stratton]]''' (Democratic) 65.8%
* {{Party stripe|Republican Party (US)}}Frederick D. Dugan (Republican) 34.2%
}}

|-
! {{Ushr|New York|36|X}}
| [[Frank Horton (New York politician)|Frank Horton]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in New York|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Frank Horton (New York politician)|Frank Horton]]''' (Republican) 67.3%
* {{Party stripe|Democratic Party (US)}}Milo Thomas (Democratic) 22.6%
* {{Party stripe|Conservative Party (US)}}Robert H. Detig (Conservative) 6.4%
* {{Party stripe|Liberal Party of New York}}Donald P. Feder (Liberal) 3.7%
}}

|-
! {{Ushr|New York|37|X}}
| [[Barber Conable]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in New York|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Barber Conable]]''' (Republican) 67.7%
* {{Party stripe|Democratic Party (US)}}Kenneth Hed (Democratic) 30.0%
* {{Party stripe|Liberal Party of New York}}Jerome Balter (Liberal) 2.4%
}}

|-
! {{Ushr|New York|38|X}}
| [[Charles Goodell]]
| {{Party shading/Republican}} | Republican
| [[1959 United States House of Representatives elections|1959 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Charles Goodell]]''' (Republican) 67.2%
* {{Party stripe|Democratic Party (US)}}Edison LeRoy Jr. (Democratic) 29.3%
* {{Party stripe|Liberal Party of New York}}Charles F. Schwartz (Liberal) 2.1%
* {{Party stripe|Conservative Party (US)}}Lloyd R. Murphy (Conservative) 1.4%
}}

|-
! {{Ushr|New York|39|X}}
| [[Richard D. McCarthy]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in New York|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Richard D. McCarthy]]''' (Democratic) 52.3%
* {{Party stripe|Republican Party (US)}}[[John R. Pillion]] (Republican) 47.7%
}}

|-
! {{Ushr|New York|40|X}}
| [[Henry P. Smith III]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in New York|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Henry P. Smith III]]''' (Republican) 61.2%
* {{Party stripe|Democratic Party (US)}}William Levitt (Democratic) 38.8%
}}

|-
! {{Ushr|New York|41|X}}
| [[Thaddeus J. Dulski]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in New York|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Thaddeus J. Dulski]]''' (Democratic) 76.4%
* {{Party stripe|Republican Party (US)}}Francis X. Schwab Jr. (Republican) 23.6%
}}

|}

== North Carolina ==
<!--{{Main|1966 United States House of Representatives elections in North Carolina}}-->
{{See also|List of United States representatives from North Carolina}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|North Carolina|1|X}}
| [[Walter B. Jones Sr.]]
| {{Party shading/Democratic}} | Democratic
| [[#Special elections|1966 <small>(special)</small>]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Walter B. Jones Sr.]]''' (Democratic) 61.3%
* {{Party stripe|Republican Party (US)}}[[John Porter East]] (Republican) 38.7%
}}

|-
! {{Ushr|North Carolina|2|X}}
| [[Lawrence H. Fountain]]
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in North Carolina|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Lawrence H. Fountain]]''' (Democratic) 64.9%
* {{Party stripe|Republican Party (US)}}Reece B. Gardner (Republican) 35.1%
}}

|-
! {{Ushr|North Carolina|3|X}}
| [[David N. Henderson]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in North Carolina|1960]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[David N. Henderson]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|North Carolina|4|X}}
| [[Harold D. Cooley]]
| {{Party shading/Democratic}} | Democratic
| [[1934 United States House of Representatives elections in North Carolina|1934]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Jim Gardner (politician)|Jim Gardner]]''' (Republican) 56.5%
* {{Party stripe|Democratic Party (US)}}[[Harold D. Cooley]] (Democratic) 43.5%
}}

|-
! {{Ushr|North Carolina|5|X}}
| [[Ralph James Scott]]
| {{Party shading/Democratic}} | Democratic
| [[1956 United States House of Representatives elections in North Carolina|1956]]
| {{Party shading/Democratic/Hold}} | Incumbent retired.<br/>Democratic hold.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Nick Galifianakis (politician)|Nick Galifianakis]]''' (Democratic) 53.1%
* {{Party stripe|Republican Party (US)}}G. Fred Steele Jr. (Republican) 46.9%
}}

|-
! {{Ushr|North Carolina|6|X}}
| [[Horace R. Kornegay]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in North Carolina|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Horace R. Kornegay]]''' (Democratic) 51.6%
* {{Party stripe|Republican Party (US)}}Richard B. Barnwell (Republican) 48.4%
}}

|-
! {{Ushr|North Carolina|7|X}}
| [[Alton Lennon]]
| {{Party shading/Democratic}} | Democratic
| [[1956 United States House of Representatives elections in North Carolina|1956]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Alton Lennon]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|North Carolina|8|X}}
| [[Charles R. Jonas]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in North Carolina|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Charles R. Jonas]]''' (Republican) 71.5%
* {{Party stripe|Democratic Party (US)}}John G. Plumides (Democratic) 28.5%
}}

|-
! {{Ushr|North Carolina|9|X}}
| [[Jim Broyhill]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in North Carolina|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Jim Broyhill]]''' (Republican) 63.3%
* {{Party stripe|Democratic Party (US)}}Robert Bingham (Democratic) 36.7%
}}

|-
! {{Ushr|North Carolina|10|X}}
| [[Basil Whitener]]
| {{Party shading/Democratic}} | Democratic
| [[1956 United States House of Representatives elections in North Carolina|1956]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Basil Whitener]]''' (Democratic) 56.1%
* {{Party stripe|Republican Party (US)}}W. Hall Young (Republican) 43.9%
}}

|-
! {{Ushr|North Carolina|11|X}}
| [[Roy A. Taylor]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in North Carolina|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Roy A. Taylor]]''' (Democratic) 52.8%
* {{Party stripe|Republican Party (US)}}W. Scott Harvey (Republican) 47.2%
}}

|}

== North Dakota ==
<!--{{Main|1966 United States House of Representatives elections in North Dakota}}-->
{{See also|List of United States representatives from North Dakota}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|North Dakota|1|X}}
| [[Mark Andrews (politician)|Mark Andrews]]
| {{Party shading/Republican}} | Republican
| [[1963 North Dakota's 1st congressional district special election|1963 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Mark Andrews (politician)|Mark Andrews]]''' (Republican) 66.2%
* {{Party stripe|North Dakota Democratic-NPL Party}}[[Buckshot Hoffner]] (Democratic-NPL) 33.8%
}}

|-
! {{Ushr|North Dakota|2|X}}
| [[Rolland W. Redlin]]
| {{Party shading/North Dakota Democratic-NPL}} | Democratic-NPL
| [[1964 United States House of Representatives elections in North Dakota|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Thomas S. Kleppe]]''' (Republican) 51.9%
* {{Party stripe|North Dakota Democratic-NPL Party}}[[Rolland W. Redlin]] (Democratic-NPL) 48.1%
}}

|}

== Ohio ==
<!--{{Main|1966 United States House of Representatives elections in Ohio}}-->
{{See also|List of United States representatives from Ohio}}

Ohio redistricted its at-large seat into a 24th district, splitting out the counties to the southwest of Dayton from the city itself, as well as moving a district in southeastern Ohio into the Columbus area.<ref name="martis" />

{{USCongressElectionTableHead}}

|-
! {{Ushr|Ohio|1|X}}
| [[John J. Gilligan]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Ohio|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Robert Taft Jr.]]''' (Republican) 52.9%
* {{Party stripe|Democratic Party (US)}}[[John J. Gilligan]] (Democratic) 47.1%
}}

|-
! {{Ushr|Ohio|2|X}}
| [[Donald D. Clancy]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Ohio|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Donald D. Clancy]]''' (Republican) 70.7%
* {{Party stripe|Democratic Party (US)}}Thomas E. Anderson (Democratic) 29.3%
}}

|-
! {{Ushr|Ohio|3|X}}
| [[Rodney M. Love]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Ohio|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Charles W. Whalen Jr.]]''' (Republican) 53.8%
* {{Party stripe|Democratic Party (US)}}[[Rodney M. Love]] (Democratic) 46.2%
}}

|-
! {{Ushr|Ohio|4|X}}
| [[William Moore McCulloch|William M. McCulloch]]
| {{Party shading/Republican}} | Republican
| [[1947 United States House of Representatives elections|1947 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William Moore McCulloch|William M. McCulloch]]''' (Republican) 63.6%
* {{Party stripe|Democratic Party (US)}}Robert H. Mihlbaugh (Democratic) 36.4%
}}

|-
! {{Ushr|Ohio|5|X}}
| [[Del Latta]]
| {{Party shading/Republican}} | Republican
| [[1958 United States House of Representatives elections in Ohio|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Del Latta]]''' (Republican) 75.3%
* {{Party stripe|Democratic Party (US)}}John H. Shock (Democratic) 24.7%
}}

|-
! {{Ushr|Ohio|6|X}}
| [[Bill Harsha]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Ohio|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Bill Harsha]]''' (Republican) 67.9%
* {{Party stripe|Democratic Party (US)}}Ottie W. Reno (Democratic) 32.1%
}}

|-
! {{Ushr|Ohio|7|X}}
| [[Bud Brown (politician)|Bud Brown]]
| {{Party shading/Republican}} | Republican
| 1965
| Incumbent re-elected.
| nowrap | {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Bud Brown (politician)|Bud Brown]]''' (Republican) ''Unopposed''

|-
! {{Ushr|Ohio|8|X}}
| [[Jackson Edward Betts]]
| {{Party shading/Republican}} | Republican
| [[1950 United States House of Representatives elections in Ohio|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Jackson Edward Betts]]''' (Republican) 67.1%
* {{Party stripe|Democratic Party (US)}}Frank Bennett (Democratic) 32.9%
}}

|-
! {{Ushr|Ohio|9|X}}
| [[Thomas L. Ashley]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Ohio|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Thomas L. Ashley]]''' (Democratic) 60.8%
* {{Party stripe|Republican Party (US)}}Jane M. Kuebbeler (Republican) 39.2%
}}

|-
! {{Ushr|Ohio|10|X}}
| [[Walter H. Moeller]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Ohio|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Clarence E. Miller]]''' (Republican) 52.0%
* {{Party stripe|Democratic Party (US)}}[[Walter H. Moeller]] (Democratic) 48.0%
}}

|-
! {{Ushr|Ohio|11|X}}
| [[J. William Stanton]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Ohio|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[J. William Stanton]]''' (Republican) 69.3%
* {{Party stripe|Democratic Party (US)}}James F. Henderson (Democratic) 30.7%
}}

|-
! {{Ushr|Ohio|12|X}}
| [[Samuel L. Devine]]
| {{Party shading/Republican}} | Republican
| [[1958 United States House of Representatives elections in Ohio|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Samuel L. Devine]]''' (Republican) 64.2%
* {{Party stripe|Democratic Party (US)}}[[Bob Shamansky]] (Democratic) 35.8%
}}

|-
! {{Ushr|Ohio|13|X}}
| [[Charles Adams Mosher]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Ohio|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Charles Adams Mosher]]''' (Republican) 65.5%
* {{Party stripe|Democratic Party (US)}}Thomas E. Wolfe (Democratic) 34.5%
}}

|-
! {{Ushr|Ohio|14|X}}
| [[William Hanes Ayres]]
| {{Party shading/Republican}} | Republican
| [[1950 United States House of Representatives elections in Ohio|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William Hanes Ayres]]''' (Republican) 59.6%
* {{Party stripe|Democratic Party (US)}}Charles F. Madden Jr. (Democratic) 40.4%
}}

|-
! {{Ushr|Ohio|15|X}}
| colspan=3 | None (district created)
| {{Party shading/Republican}} | New seat.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Chalmers Wylie]]''' (Republican) 59.9%
* {{Party stripe|Republican Party (US)}}Robert L. Van Heyde (Republican) 40.1%
}}

|-
! {{Ushr|Ohio|16|X}}
| [[Frank T. Bow]]
| {{Party shading/Republican}} | Republican
| [[1950 United States House of Representatives elections in Ohio|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Frank T. Bow]]''' (Republican) 61.1%
* {{Party stripe|Democratic Party (US)}}[[Robert D. Freeman]] (Democratic) 38.9%
}}

|-
! rowspan=2 | {{Ushr|Ohio|17|X}}
| [[John M. Ashbrook]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Ohio|1960]]
| Incumbent re-elected.
| rowspan=2 nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John M. Ashbrook]]''' (Republican) 55.3%
* {{Party stripe|Democratic Party (US)}}[[Robert T. Secrest]] (Democratic) 44.7%
}}

|-
| [[Robert T. Secrest]]<br/>{{Small|Redistricted from the {{Ushr|OH|15|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Ohio|1962]]
| {{Party shading/Loss}} | Incumbent lost re-election.<br/>'''Democratic loss'''.

|-
! {{Ushr|Ohio|18|X}}
| [[Wayne Hays]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in Ohio|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Wayne Hays]]''' (Democratic) 64.1%
* {{Party stripe|Republican Party (US)}}William H. Weir (Republican) 35.9%
}}

|-
! {{Ushr|Ohio|19|X}}
| [[Michael J. Kirwan]]
| {{Party shading/Democratic}} | Democratic
| [[1936 United States House of Representatives elections in Ohio|1936]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Michael J. Kirwan]]''' (Democratic) 71.9%
* {{Party stripe|Republican Party (US)}}Donald J. Lewis (Republican) 28.1%
}}

|-
! {{Ushr|Ohio|20|X}}
| [[Michael A. Feighan]]
| {{Party shading/Democratic}} | Democratic
| [[1942 United States House of Representatives elections in Ohio|1942]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Michael A. Feighan]]''' (Democratic) 76.1%
* {{Party stripe|Republican Party (US)}}Clarence E. McLeod (Republican) 23.9%
}}

|-
! {{Ushr|Ohio|21|X}}
| [[Charles Vanik]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Ohio|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Charles Vanik]]''' (Democratic) 81.7%
* {{Party stripe|Republican Party (US)}}Frederick M. Coleman (Republican) 18.3%
}}

|-
! {{Ushr|Ohio|22|X}}
| [[Frances P. Bolton]]
| {{Party shading/Republican}} | Republican
| [[1940 United States House of Representatives elections in Ohio|1940]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Frances P. Bolton]]''' (Republican) 55.9%
* {{Party stripe|Democratic Party (US)}}[[Anthony O. Calabrese Jr.]] (Democratic) 44.1%
}}

|-
! {{Ushr|Ohio|23|X}}
| [[William Edwin Minshall Jr.|William E. Minshall Jr.]]
| {{Party shading/Republican}} | Republican
| [[1954 United States House of Representatives elections in Ohio|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William Edwin Minshall Jr.|William E. Minshall Jr.]]''' (Republican) 73.2%
* {{Party stripe|Democratic Party (US)}}Sheldon D. Clark (Democratic) 26.8%
}}

|-
! {{Ushr|Ohio|24|X}}
| [[Robert E. Sweeney]]<br/>{{Small|Redistricted from the {{Ushr|OH|AL|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Ohio|1964]]
| {{Party shading/Republican}} | Incumbent retired.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Buz Lukens]]''' (Republican) 58.5%
* {{Party stripe|Democratic Party (US)}}James H. Pelley (Democratic) 41.5%
}}

|}

== Oklahoma ==
<!--{{Main|1966 United States House of Representatives elections in Oklahoma}}-->
{{See also|List of United States representatives from Oklahoma}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Oklahoma|1|X}}
| [[Page Belcher]]
| {{Party shading/Republican}} | Republican
| [[1950 United States House of Representatives elections in Oklahoma|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Page Belcher]]''' (Republican) 69.7%
* {{Party stripe|Democratic Party (US)}}Ed Cadenhead (Democratic) 30.3%
}}

|-
! {{Ushr|Oklahoma|2|X}}
| [[Ed Edmondson (politician)|Ed Edmondson]]
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in Oklahoma|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Ed Edmondson (politician)|Ed Edmondson]]''' (Democratic) 53.6%
* {{Party stripe|Republican Party (US)}}[[Denzil Garrison]] (Republican) 46.4%
}}

|-
! {{Ushr|Oklahoma|3|X}}
| [[Carl Albert]]
| {{Party shading/Democratic}} | Democratic
| [[1946 United States House of Representatives elections in Oklahoma|1946]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Carl Albert]]''' (Democratic) 77.2%
* {{Party stripe|Republican Party (US)}}Whit Pate (Republican) 22.8%
}}

|-
! {{Ushr|Oklahoma|4|X}}
| [[Tom Steed]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in Oklahoma|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Tom Steed]]''' (Democratic) 50.2%
* {{Party stripe|Republican Party (US)}}Truman T. Branscum (Republican) 49.8%
}}

|-
! {{Ushr|Oklahoma|5|X}}
| [[John Jarman]]
| {{Party shading/Democratic}} | Democratic
| [[1950 United States House of Representatives elections in Oklahoma|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John Jarman]]''' (Democratic) 69.6%
* {{Party stripe|Republican Party (US)}}Melvin H. Gragg (Republican) 30.4%
}}

|-
! {{Ushr|Oklahoma|6|X}}
| [[Jed Johnson Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Oklahoma|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[James Vernon Smith]]''' (Republican) 51.4%
* {{Party stripe|Democratic Party (US)}}[[Jed Johnson Jr.]] (Democratic) 48.6%
}}

|}

== Oregon ==
<!--{{Main|1966 United States House of Representatives elections in Oregon}}-->
{{See also|List of United States representatives from Oregon}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Oregon|1|X}}
| [[Wendell Wyatt]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Oregon|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Wendell Wyatt]]''' (Republican) 74.3%
* {{Party stripe|Democratic Party (US)}}Malcolm Cross (Democratic) 25.7%
}}

|-
! {{Ushr|Oregon|2|X}}
| [[Al Ullman]]
| {{Party shading/Democratic}} | Democratic
| [[1956 United States House of Representatives elections in Oregon|1956]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Al Ullman]]''' (Democratic) 63.3%
* {{Party stripe|Republican Party (US)}}Everett J. Thoren (Republican) 36.7%
}}

|-
! {{Ushr|Oregon|3|X}}
| [[Edith Green]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Oregon|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Edith Green]]''' (Democratic) 67.0%
* {{Party stripe|Republican Party (US)}}Lyle Dean (Republican) 33.0%
}}

|-
! {{Ushr|Oregon|4|X}}
| [[Robert B. Duncan]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Oregon|1962]]
| {{Party shading/Republican}} | Incumbent retired to [[1966 United States Senate election in Oregon|run for U.S. Senator]].<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John R. Dellenback]]''' (Republican) 62.7%
* {{Party stripe|Democratic Party (US)}}[[Charles O. Porter]] (Democratic) 37.3%
}}

|}

== Pennsylvania ==
<!--{{Main|1966 United States House of Representatives elections in Pennsylvania}}-->
{{See also|List of United States representatives from Pennsylvania}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Pennsylvania|1|X}}
| [[William A. Barrett]]
| {{Party shading/Democratic}} | Democratic
| [[1944 United States House of Representatives elections in Pennsylvania|1944]]<br/>1946 {{Small|(lost)}}<br/>[[1948 United States House of Representatives elections in Pennsylvania|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William A. Barrett]]''' (Democratic) 66.1%
* {{Party stripe|Republican Party (US)}}[[Beatrice Chernock]] (Republican) 33.9%
}}

|-
! {{Ushr|Pennsylvania|2|X}}
| [[Robert N. C. Nix Sr.]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Pennsylvania|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Robert N. C. Nix Sr.]]''' (Democratic) 59.9%
* {{Party stripe|Republican Party (US)}}Herbert R. Cain Jr. (Republican) 40.1%
}}

|-
! {{Ushr|Pennsylvania|3|X}}
| [[James A. Byrne]]
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in Pennsylvania|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[James A. Byrne]]''' (Democratic) 56.6%
* {{Party stripe|Republican Party (US)}}Walter T. Darmopray (Republican) 43.4%
}}

|-
! {{Ushr|Pennsylvania|4|X}}
| [[Herman Toll]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Pennsylvania|1958]]
| {{Party shading/Democratic/Hold}} | Incumbent retired.<br/>Democratic hold.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Joshua Eilberg]]''' (Democratic) 51.9%
* {{Party stripe|Republican Party (US)}}Robert Bear Cohen (Republican) 48.1%
}}

|-
! {{Ushr|Pennsylvania|5|X}}
| [[William J. Green III]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Pennsylvania|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William J. Green III]]''' (Democratic) 59.1%
* {{Party stripe|Republican Party (US)}}Michael J. Bednarek (Republican) 40.9%
}}

|-
! {{Ushr|Pennsylvania|6|X}}
| [[George M. Rhodes]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in Pennsylvania|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[George M. Rhodes]]''' (Democratic) 56.1%
* {{Party stripe|Republican Party (US)}}Daniel B. Boyer Jr. (Republican) 43.9%
}}

|-
! {{Ushr|Pennsylvania|7|X}}
| colspan=3 | None (district created)
| {{Party shading/Republican}} | New seat.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Lawrence G. Williams]]''' (Republican) 63.2%
* {{Party stripe|Democratic Party (US)}}John J. Logue (Democratic) 36.8%
}}

|-
! {{Ushr|Pennsylvania|8|X}}
| [[Willard S. Curtin]]
| {{Party shading/Republican}} | Republican
| [[1956 United States House of Representatives elections in Pennsylvania|1956]]
| {{Party shading/Republican/Hold}} | Incumbent retired.<br/>Republican hold.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Edward G. Biester Jr.]]''' (Republican) 59.1%
* {{Party stripe|Democratic Party (US)}}Walter S. Farley Jr. (Democratic) 40.9%
}}

|-
! rowspan=2 | {{Ushr|Pennsylvania|9|X}}
| [[George Watkins (politician)|George Watkins]]<br/>{{Small|Redistricted from the {{Ushr|PA|7|C}}}}
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Pennsylvania|1964]]
| Incumbent re-elected.
| rowspan=2 nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[George Watkins (politician)|George Watkins]]''' (Republican) 62.6%
* {{Party stripe|Democratic Party (US)}}John A. O'Brien (Democratic) 37.4%
}}

|-
| [[Paul B. Dague]]
| {{Party shading/Republican}} | Republican
| [[1946 United States House of Representatives elections in Pennsylvania|1946]]
| {{Party shading/Loss}} | Incumbent retired.<br/>'''Republican loss'''.

|-
! {{Ushr|Pennsylvania|10|X}}
| [[Joseph M. McDade]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in Pennsylvania|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Joseph M. McDade]]''' (Republican) 66.8%
* {{Party stripe|Democratic Party (US)}}Neil Trama (Democratic) 33.2%
}}

|-
! {{Ushr|Pennsylvania|11|X}}
| [[Dan Flood]]
| {{Party shading/Democratic}} | Democratic
| [[1944 United States House of Representatives elections in Pennsylvania|1944]]<br/>1946 {{Small|(lost)}}<br/>[[1948 United States House of Representatives elections in Pennsylvania|1948]]<br/>1952 {{Small|(lost)}}<br/>[[1954 United States House of Representatives elections in Pennsylvania|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Dan Flood]]''' (Democratic) 67.2%
* {{Party stripe|Republican Party (US)}}Gerald C. Broadt (Republican) 32.8%
}}

|-
! {{Ushr|Pennsylvania|12|X}}
| [[J. Irving Whalley]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Pennsylvania|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[J. Irving Whalley]]''' (Republican) 66.9%
* {{Party stripe|Democratic Party (US)}}J. Robert Rohm (Democratic) 33.1%
}}

|-
! {{Ushr|Pennsylvania|13|X}}
| [[Richard Schweiker]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Pennsylvania|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Richard Schweiker]]''' (Republican) 72.5%
* {{Party stripe|Democratic Party (US)}}William D. Searle (Democratic) 27.5%
}}

|-
! {{Ushr|Pennsylvania|14|X}}
| [[William S. Moorhead]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Pennsylvania|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William S. Moorhead]]''' (Democratic) 68.3%
* {{Party stripe|Republican Party (US)}}[[Dick Thornburgh]] (Republican) 31.7%
}}

|-
! {{Ushr|Pennsylvania|15|X}}
| [[Fred B. Rooney]]
| {{Party shading/Democratic}} | Democratic
| [[1963 United States House of Representatives elections|1963 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Fred B. Rooney]]''' (Democratic) 52.4%
* {{Party stripe|Republican Party (US)}}George J. Joseph (Republican) 47.6%
}}

|-
! {{Ushr|Pennsylvania|16|X}}
| [[John C. Kunkel]]
| {{Party shading/Republican}} | Republican
| [[1961 United States House of Representatives elections|1961 {{Small|(special)}}]]
| {{Party shading/Republican/Hold}} | Incumbent retired.<br/>Republican hold.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Edwin D. Eshleman]]''' (Republican) 69.2%
* {{Party stripe|Democratic Party (US)}}Richard F. Charles (Democratic) 30.8%
}}

|-
! {{Ushr|Pennsylvania|17|X}}
| [[Herman T. Schneebeli]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Pennsylvania|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Herman T. Schneebeli]]''' (Republican) 66.2%
* {{Party stripe|Democratic Party (US)}}William Conrad Reuter (Democratic) 33.8%
}}

|-
! {{Ushr|Pennsylvania|18|X}}
| [[Robert J. Corbett]]
| {{Party shading/Republican}} | Republican
| [[1938 United States House of Representatives elections in Pennsylvania|1938]]<br/>1940 {{Small|(lost)}}<br/>[[1944 United States House of Representatives elections in Pennsylvania|1944]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Robert J. Corbett]]''' (Republican) 67.1%
* {{Party stripe|Democratic Party (US)}}John R. Wohlfarth (Democratic) 32.9%
}}

|-
! {{Ushr|Pennsylvania|19|X}}
| [[Nathaniel N. Craley Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Pennsylvania|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[George A. Goodling]]''' (Republican) 51.7%
* {{Party stripe|Democratic Party (US)}}[[Nathaniel N. Craley Jr.]] (Democratic) 48.3%
}}

|-
! {{Ushr|Pennsylvania|20|X}}
| [[Elmer J. Holland]]
| {{Party shading/Democratic}} | Democratic
| [[1942 Pennsylvania's 33rd congressional district special election|1942 {{Small|(special)}}]]<br/>1942 {{Small|(retired)}}<br/>[[1956 Pennsylvania's 30th congressional district special election|1956 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Elmer J. Holland]]''' (Democratic) 65.9%
* {{Party stripe|Republican Party (US)}}Joseph Sabol Jr. (Republican) 34.1%
}}

|-
! {{Ushr|Pennsylvania|21|X}}
| [[John Herman Dent]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Pennsylvania|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John Herman Dent]]''' (Democratic) 64.2%
* {{Party stripe|Republican Party (US)}}Edward B. Byrne (Republican) 35.8%
}}

|-
! {{Ushr|Pennsylvania|22|X}}
| [[John P. Saylor]]
| {{Party shading/Republican}} | Republican
| [[1949 United States House of Representatives elections|1949 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John P. Saylor]]''' (Republican) 67.5%
* {{Party stripe|Democratic Party (US)}}Frank H. Buck (Democratic) 32.5%
}}

|-
! {{Ushr|Pennsylvania|23|X}}
| [[Albert W. Johnson]]
| {{Party shading/Republican}} | Republican
| [[1963 United States House of Representatives elections|1963 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Albert W. Johnson]]''' (Republican) 62.8%
* {{Party stripe|Democratic Party (US)}}Robert Mitchell (Democratic) 37.2%
}}

|-
! {{Ushr|Pennsylvania|24|X}}
| [[Joseph P. Vigorito]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Pennsylvania|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Joseph P. Vigorito]]''' (Democratic) 55.3%
* {{Party stripe|Republican Party (US)}}[[James D. Weaver]] (Republican) 44.7%
}}

|-
! {{Ushr|Pennsylvania|25|X}}
| [[Frank M. Clark]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Pennsylvania|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Frank M. Clark]]''' (Democratic) 64.5%
* {{Party stripe|Republican Party (US)}}John F. Heath (Republican) 35.5%
}}

|-
! {{Ushr|Pennsylvania|26|X}}
| [[Thomas E. Morgan]]
| {{Party shading/Democratic}} | Democratic
| [[1944 United States House of Representatives elections in Pennsylvania|1944]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Thomas E. Morgan]]''' (Democratic) 64.1%
* {{Party stripe|Republican Party (US)}}Paul P. Riggle (Republican) 35.9%
}}

|-
! {{Ushr|Pennsylvania|27|X}}
| [[James G. Fulton]]
| {{Party shading/Republican}} | Republican
| [[1944 United States House of Representatives elections in Pennsylvania|1944]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[James G. Fulton]]''' (Republican) 67.7%
* {{Party stripe|Democratic Party (US)}}Stephen J. Arnold (Democratic) 32.3%
}}

|}

== Rhode Island ==
<!--{{Main|1966 United States House of Representatives elections in Rhode Island}}-->
{{See also|List of United States representatives from Rhode Island}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Rhode Island|1|X}}
| [[Fernand St Germain]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in Rhode Island|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Fernand St Germain]]''' (Democratic) 56.8%
* {{Party stripe|Republican Party (US)}}Raymond W. Houghton (Republican) 43.2%
}}

|-
! {{Ushr|Rhode Island|2|X}}
| [[John E. Fogarty]]
| {{Party shading/Democratic}} | Democratic
| [[1940 United States House of Representatives elections in Rhode Island|1940]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John E. Fogarty]]''' (Democratic) 64.7%
* {{Party stripe|Republican Party (US)}}Everett C. Sammartino (Republican) 35.3%
}}

|}

== South Carolina ==
{{Main|1966 United States House of Representatives elections in South Carolina}}
{{See also|List of United States representatives from South Carolina}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|South Carolina|1|X}}
| [[L. Mendel Rivers]]
| {{Party shading/Democratic}} | Democratic
| [[1940 United States House of Representatives elections in South Carolina|1940]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[L. Mendel Rivers]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|South Carolina|2|X}}
| [[Albert Watson (South Carolina politician)|Albert Watson]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in South Carolina|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Albert Watson (South Carolina politician)|Albert Watson]]''' (Republican) 64.3%
* {{Party stripe|Democratic Party (US)}}Fred LeClercq (Democratic) 35.7%
}}

|-
! {{Ushr|South Carolina|3|X}}
| [[William Jennings Bryan Dorn|William J. B. Dorn]]
| {{Party shading/Democratic}} | Democratic
| [[1946 United States House of Representatives elections in South Carolina|1946]]<br/>1948 {{Small|(retired)}}<br/>[[1950 United States House of Representatives elections in South Carolina|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William Jennings Bryan Dorn|William J. B. Dorn]]''' (Democratic) 57.8%
* {{Party stripe|Republican Party (US)}}John Grisso (Republican) 42.2%
}}

|-
! {{Ushr|South Carolina|4|X}}
| [[Robert T. Ashmore]]
| {{Party shading/Democratic}} | Democratic
| [[1953 United States House of Representatives elections|1953 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Robert T. Ashmore]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|South Carolina|5|X}}
| [[Thomas S. Gettys]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in South Carolina|1964]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Thomas S. Gettys]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|South Carolina|6|X}}
| [[John L. McMillan]]
| {{Party shading/Democratic}} | Democratic
| [[1938 United States House of Representatives elections in South Carolina|1938]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John L. McMillan]]''' (Democratic) 61.7%
* {{Party stripe|Republican Party (US)}}Archie Odom (Republican) 38.3%
}}

|}

== South Dakota ==
<!--{{Main|1966 United States House of Representatives elections in South Dakota}}-->
{{See also|List of United States representatives from South Dakota}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|South Dakota|1|X}}
| [[Ben Reifel]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in South Dakota|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Ben Reifel]]''' (Republican) 66.7%
* {{Party stripe|Democratic Party (US)}}Francis Richter (Democratic) 33.3%
}}

|-
! {{Ushr|South Dakota|2|X}}
| [[E. Y. Berry]]
| {{Party shading/Republican}} | Republican
| [[1950 United States House of Representatives elections in South Dakota|1950]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[E. Y. Berry]]''' (Republican) 60.5%
* {{Party stripe|Democratic Party (US)}}Jack P. Allmon (Democratic) 39.5%
}}

|}

== Tennessee ==
<!--{{Main|1966 United States House of Representatives elections in Tennessee}}-->
{{See also|List of United States representatives from Tennessee}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Tennessee|1|X}}
| [[Jimmy Quillen]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in Tennessee|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Jimmy Quillen]]''' (Republican) 87.1%
* {{Party stripe|Independent}}Temus Bright (Independent) 12.9%
}}

|-
! {{Ushr|Tennessee|2|X}}
| [[John Duncan Sr.]]
| {{Party shading/Republican}} | Republican
| [[1964 United States House of Representatives elections in Tennessee|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John Duncan Sr.]]''' (Republican) 78.9%
* {{Party stripe|Democratic Party (US)}}Jake Armstrong (Democratic) 21.1%
}}

|-
! {{Ushr|Tennessee|3|X}}
| [[Bill Brock]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in Tennessee|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Bill Brock]]''' (Republican) 64.2%
* {{Party stripe|Democratic Party (US)}}Franklin Haney (Democratic) 35.8%
}}

|-
! {{Ushr|Tennessee|4|X}}
| [[Joe L. Evins]]
| {{Party shading/Democratic}} | Democratic
| [[1946 United States House of Representatives elections in Tennessee|1946]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Joe L. Evins]]''' (Democratic) 90.0%
* {{Party stripe|Independent}}William Bean (Independent) 10.0%
}}

|-
! {{Ushr|Tennessee|5|X}}
| [[Richard Fulton]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Tennessee|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Richard Fulton]]''' (Democratic) 63.0%
* {{Party stripe|Republican Party (US)}}George Kelly (Republican) 37.0%
}}

|-
! {{Ushr|Tennessee|6|X}}
| [[William Anderson (naval officer)|William Anderson]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Tennessee|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William Anderson (naval officer)|William Anderson]]''' (Democratic) 79.6%
* {{Party stripe|Independent}}Cecil R. Hill (Independent) 20.4%
}}

|-
! {{Ushr|Tennessee|7|X}}
| [[Tom J. Murray]]
| {{Party shading/Democratic}} | Democratic
| [[1942 United States House of Representatives elections in Tennessee|1942]]
| {{Party shading/Democratic/Hold}} | Incumbent lost renomination.<br/>Democratic hold.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Ray Blanton]]''' (Democratic) 50.6%
* {{Party stripe|Republican Party (US)}}Julius Hurst (Republican) 48.4%
* {{Party stripe|Independent}}L. B. Winfield (Independent) 1.0%
}}

|-
! {{Ushr|Tennessee|8|X}}
| [[Fats Everett]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Tennessee|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Fats Everett]]''' (Democratic) 75.2%
* {{Party stripe|Republican Party (US)}}Jim Boyd (Republican) 24.8%
}}

|-
! {{Ushr|Tennessee|9|X}}
| [[George W. Grider]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Tennessee|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Dan Kuykendall]]''' (Republican) 52.2%
* {{Party stripe|Democratic Party (US)}}[[George W. Grider]] (Democratic) 47.8%
}}

|}

== Texas ==
<!--{{Main|1966 United States House of Representatives elections in Texas}}-->
{{See also|List of United States representatives from Texas}}

Texas redistricted for this election, eliminating its at-large district and removing two East Texas districts in favor of adding three districts in South Texas, suburban Houston, and suburban Dallas.<ref name="martis" />

{{USCongressElectionTableHead}}

|-
! {{Ushr|Texas|1|X}}
| [[Wright Patman]]
| {{Party shading/Democratic}} | Democratic
| [[1928 United States House of Representatives elections in Texas|1928]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Wright Patman]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Texas|2|X}}
| [[John Dowdy]]<br/>{{Small|Redistricted from the {{Ushr|TX|7|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in Texas|1952]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John Dowdy]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Texas|3|X}}
| [[Joe R. Pool]]<br/>{{Small|Redistricted from the {{Ushr|TX|AL|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Texas|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Joe R. Pool]]''' (Democratic) 53.4%
* {{Party stripe|Republican Party (US)}}Bill Hayes (Republican) 46.6%
}}

|-
! rowspan=2 | {{Ushr|Texas|4|X}}
| [[Ray Roberts (politician)|Ray Roberts]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Texas|1962]]
| Incumbent re-elected.
| rowspan=2 nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Ray Roberts (politician)|Ray Roberts]]''' (Democratic) ''Unopposed''

|-
| [[Lindley Beckworth]]<br/>{{Small|Redistricted from the {{Ushr|TX|3|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1956 United States House of Representatives elections in Texas|1956]]
| {{Party shading/Loss}} | Incumbent lost renomination.<br/>'''Democratic loss'''.

|-
! {{Ushr|Texas|5|X}}
| [[Earle Cabell]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Texas|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Earle Cabell]]''' (Democratic) 61.0%
* {{Party stripe|Republican Party (US)}}Duke Burgess (Republican) 39.0%
}}

|-
! {{Ushr|Texas|6|X}}
| [[Olin E. Teague]]
| {{Party shading/Democratic}} | Democratic
| [[1946 United States House of Representatives elections in Texas|1946]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Olin E. Teague]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Texas|7|X}}
| colspan=3 | None (district created)
| {{Party shading/Republican}} | New seat.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[George H. W. Bush]]''' (Republican) 57.1%
* {{Party stripe|Democratic Party (US)}}Frank Briscoe (Democratic) 42.4%
* {{Party stripe|Constitution Party (US)}}Bob Gray ([[Constitution Party (United States)|Constitution]]) 0.5%
}}

|-
! {{Ushr|Texas|8|X}}
| [[Lera Millard Thomas]]
| {{Party shading/Democratic}} | Democratic
| [[1966 United States House of Representatives elections in Texas|1966]]
| {{Party shading/Democratic/Hold}} | Incumbent retired.<br/>Democratic hold.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Robert C. Eckhardt]]''' (Democratic) 92.3%
* {{Party stripe|Republican Party (US)}}W. D. Spayne (Republican) 7.7%
}}

|-
! rowspan=2 | {{Ushr|Texas|9|X}}
| [[Jack Brooks (American politician)|Jack Brooks]]<br/>{{Small|Redistricted from the {{Ushr|TX|2|C}}}}
| {{Party shading/Democratic}} | Democratic
| [[1952 United States House of Representatives elections in Texas|1952]]
| Incumbent re-elected.
| rowspan=2 nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Jack Brooks (American politician)|Jack Brooks]]''' (Democratic) ''Unopposed''

|-
| [[Clark W. Thompson (Texas politician)|Clark W. Thompson]]
| {{Party shading/Democratic}} | Democratic
| [[1947 United States House of Representatives elections|1947 {{Small|(special)}}]]
| {{Party shading/Loss}} | Incumbent retired.<br/>'''Democratic loss'''.

|-
! {{Ushr|Texas|10|X}}
| [[J. J. Pickle]]
| {{Party shading/Democratic}} | Democratic
| [[1963 United States House of Representatives elections|1963 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[J. J. Pickle]]''' (Democratic) 74.3%
* {{Party stripe|Republican Party (US)}}Jane Sumner (Republican) 24.6%
* {{Party stripe|Constitution Party (US)}}R. R. Richter (Constitution) 1.1%
}}

|-
! {{Ushr|Texas|11|X}}
| [[William R. Poage]]
| {{Party shading/Democratic}} | Democratic
| [[1936 United States House of Representatives elections in Texas|1936]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William R. Poage]]''' (Democratic) 94.9%
* {{Party stripe|Conservative Party (US)}}Laurel N. Dunn (Conservative) 5.1%
}}

|-
! {{Ushr|Texas|12|X}}
| [[Jim Wright]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Texas|1954]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Jim Wright]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Texas|13|X}}
| [[Graham B. Purcell Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Texas|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Graham B. Purcell Jr.]]''' (Democratic) 57.1%
* {{Party stripe|Republican Party (US)}}D. C. Norwood (Republican) 42.9%
}}

|-
! {{Ushr|Texas|14|X}}
| [[John Andrew Young]]
| {{Party shading/Democratic}} | Democratic
| [[1956 United States House of Representatives elections in Texas|1956]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John Andrew Young]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Texas|15|X}}
| [[Kika de la Garza]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Texas|1964]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Kika de la Garza]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Texas|16|X}}
| [[Richard Crawford White]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Texas|1964]]
| Incumbent re-elected.
| nowrap |{{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Richard Crawford White]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Texas|17|X}}
| [[Omar Burleson]]
| {{Party shading/Democratic}} | Democratic
| [[1946 United States House of Representatives elections in Texas|1946]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Omar Burleson]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Texas|18|X}}
| [[Walter E. Rogers]]
| {{Party shading/Democratic}} | Democratic
| [[1950 United States House of Representatives elections in Texas|1950]]
| {{Party shading/Republican}} | Incumbent retired.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Bob Price (Texas politician)|Robert Price]]''' (Republican) 59.5%
* {{Party stripe|Democratic Party (US)}}Dee Miller (Democratic) 40.5%
}}

|-
! {{Ushr|Texas|19|X}}
| [[George H. Mahon]]
| {{Party shading/Democratic}} | Democratic
| [[1934 United States House of Representatives elections in Texas|1934]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[George H. Mahon]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Texas|20|X}}
| [[Henry B. González]]
| {{Party shading/Democratic}} | Democratic
| [[1961 United States House of Representatives elections|1961 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Henry B. González]]''' (Democratic) 87.1%
* {{Party stripe|Conservative Party (US)}}Robert C. Moore (Conservative) 7.8%
* {{Party stripe|Constitution Party (US)}}Bert Ellis (Constitution) 5.1%
}}

|-
! {{Ushr|Texas|21|X}}
| [[O. C. Fisher]]
| {{Party shading/Democratic}} | Democratic
| [[1942 United States House of Representatives elections in Texas|1942]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[O. C. Fisher]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Texas|22|X}}
| [[Robert R. Casey]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Texas|1958]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Robert R. Casey]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Texas|23|X}}
| colspan=3 | None (district created)
| {{Party shading/Democratic}} | New seat.<br/>'''Democratic gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Abraham Kazen]]''' (Democratic) 96.4%
* {{Party stripe|Constitution Party (US)}}Richard K. Troxell (Constitution) 3.6%
}}

|}

== Utah ==
<!--{{Main|1966 United States House of Representatives elections in Utah}}-->
{{See also|List of United States representatives from Utah}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Utah|1|X}}
| [[Laurence J. Burton]]
| {{Party shading/Republican}} | Republican
| [[1962 United States House of Representatives elections in Utah|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Laurence J. Burton]]''' (Republican) 66.5%
* {{Party stripe|Democratic Party (US)}}[[J. Keith Melville]] (Democratic) 33.5%
}}

|-
! {{Ushr|Utah|2|X}}
| [[David S. King]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Utah|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Sherman P. Lloyd]]''' (Republican) 61.3%
* {{Party stripe|Democratic Party (US)}}[[David S. King]] (Democratic) 38.7%
}}

|}

== Vermont ==
<!--{{Main|1966 United States House of Representatives election in Vermont}}-->
{{See also|List of United States representatives from Vermont}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Vermont|AL|X}}
| [[Robert Stafford]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives election in Vermont|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Robert Stafford]]''' (Republican) 65.6%
* {{Party stripe|Democratic Party (US)}}William J. Ryan (Democratic) 34.4%
}}

|}

== Virginia ==
<!--{{Main|1966 United States House of Representatives elections in Virginia}}-->
{{See also|List of United States representatives from Virginia}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Virginia|1|X}}
| [[Thomas N. Downing]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Virginia|1958]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Thomas N. Downing]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Virginia|2|X}}
| [[Porter Hardy Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1946 United States House of Representatives elections in Virginia|1946]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Porter Hardy Jr.]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Virginia|3|X}}
| [[David E. Satterfield III]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Virginia|1964]]
| Incumbent re-elected.
| nowrap | {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[David E. Satterfield III]]''' (Democratic) ''Unopposed''

|-
! {{Ushr|Virginia|4|X}}
| [[Watkins Abbitt]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in Virginia|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Watkins Abbitt]]''' (Democratic) 66.5%
* {{Party stripe|Independent}}Edward J. SIlverman (Independent) 21.8%
* {{Party stripe|Write-in}}Others 11.6%
}}

|-
! {{Ushr|Virginia|5|X}}
| [[William M. Tuck]]
| {{Party shading/Democratic}} | Democratic
| [[1953 United States House of Representatives elections|1953 {{Small|(special)}}]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[William M. Tuck]]''' (Democratic) 56.2%
* {{Party stripe|Republican Party (US)}}Robert L. Gilliam (Republican) 43.8%
}}

|-
! {{Ushr|Virginia|6|X}}
| [[Richard H. Poff]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in Virginia|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Richard H. Poff]]''' (Republican) 80.8%
* {{Party stripe|Democratic Party (US)}}Murray A. Stoller (Democratic) 19.2%
}}

|-
! {{Ushr|Virginia|7|X}}
| [[John O. Marsh Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1962 United States House of Representatives elections in Virginia|1962]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John O. Marsh Jr.]]''' (Democratic) 59.3%
* {{Party stripe|Republican Party (US)}}Edward O. McCue III (Republican) 40.7%
}}

|-
! {{Ushr|Virginia|8|X}}
| [[Howard W. Smith]]
| {{Party shading/Democratic}} | Democratic
| [[1930 United States House of Representatives elections in Virginia|1930]]
| {{Party shading/Republican}} | Incumbent lost renomination.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William L. Scott]]''' (Republican) 57.2%
* {{Party stripe|Democratic Party (US)}}[[George Rawlings]] (Democratic) 42.8%
}}

|-
! {{Ushr|Virginia|9|X}}
| [[W. Pat Jennings]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Virginia|1954]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William C. Wampler]]''' (Republican) 53.7%
* {{Party stripe|Democratic Party (US)}}[[W. Pat Jennings]] (Democratic) 46.3%
}}

|-
! {{Ushr|Virginia|10|X}}
| [[Joel Broyhill]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in Virginia|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Joel Broyhill]]''' (Republican) 58.3%
* {{Party stripe|Democratic Party (US)}}[[Clive L. DuVal II]] (Democratic) 41.7%
}}

|}

== Washington ==
<!--{{Main|1966 United States House of Representatives elections in Washington}}-->
{{See also|List of United States representatives from Washington}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Washington|1|X}}
| [[Thomas Pelly]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in Washington|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Thomas Pelly]]''' (Republican) 80.3%
* {{Party stripe|Democratic Party (US)}}Alice Franklin Bryant (Democratic) 19.7%
}}

|-
! {{Ushr|Washington|2|X}}
| [[Lloyd Meeds]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Washington|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Lloyd Meeds]]''' (Democratic) 60.7%
* {{Party stripe|Republican Party (US)}}Eugene M. Smith (Republican) 36.0%
* {{Party stripe|Conservative Party (US)}}George E. Pittan (Conservative) 2.4%
* {{Party stripe|Peace and Freedom Party (US)}}Frank L. Batterson (Peace and Freedom) 0.9%
}}

|-
! {{Ushr|Washington|3|X}}
| [[Julia Butler Hansen]]
| {{Party shading/Democratic}} | Democratic
| [[1960 United States House of Representatives elections in Washington|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Julia Butler Hansen]]''' (Democratic) 65.7%
* {{Party stripe|Republican Party (US)}}Keith Kisor (Republican) 34.3%
}}

|-
! {{Ushr|Washington|4|X}}
| [[Catherine Dean May]]
| {{Party shading/Republican}} | Republican
| [[1958 United States House of Representatives elections in Washington|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Catherine Dean May]]''' (Republican) 62.1%
* {{Party stripe|Democratic Party (US)}}Gustav Bansmer (Democratic) 30.3%
* {{Party stripe|Conservative Party (US)}}[[Floyd Paxton]] (Conservative) 7.6%
}}

|-
! {{Ushr|Washington|5|X}}
| [[Tom Foley]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Washington|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Tom Foley]]''' (Democratic) 56.5%
* {{Party stripe|Republican Party (US)}}Dorothy R. Powers (Republican) 43.5%
}}

|-
! {{Ushr|Washington|6|X}}
| [[Floyd Hicks]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Washington|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Floyd Hicks]]''' (Democratic) 60.4%
* {{Party stripe|Republican Party (US)}}George Mahler (Republican) 39.6%
}}

|-
! {{Ushr|Washington|7|X}}
| [[Brock Adams]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Washington|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Brock Adams]]''' (Democratic) 62.8%
* {{Party stripe|Republican Party (US)}}James Munn (Republican) 36.0%
* {{Party stripe|Peace and Freedom Party (US)}}Robert B. Shaw (Peace and Freedom) 1.2%
}}

|}

== West Virginia ==
<!--{{Main|1966 United States House of Representatives elections in West Virginia}}-->
{{See also|List of United States representatives from West Virginia|1966 United States Senate election in West Virginia}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|West Virginia|1|X}}
| [[Arch A. Moore Jr.]]
| {{Party shading/Republican}} | Republican
| [[1956 United States House of Representatives elections in West Virginia|1956]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Arch A. Moore Jr.]]''' (Republican) 70.9%
* {{Party stripe|Democratic Party (US)}}[[William Matthew Kidd|William M. Kidd]] (Democratic) 29.1%
}}

|-
! {{Ushr|West Virginia|2|X}}
| [[Harley Orrin Staggers]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in West Virginia|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Harley Orrin Staggers]]''' (Democratic) 60.3%
* {{Party stripe|Republican Party (US)}}George L. Strader (Republican) 39.7%
}}

|-
! {{Ushr|West Virginia|3|X}}
| [[John M. Slack Jr.]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in West Virginia|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[John M. Slack Jr.]]''' (Democratic) 61.6%
* {{Party stripe|Republican Party (US)}}Mal Guthrie (Republican) 38.4%
}}

|-
! {{Ushr|West Virginia|4|X}}
| [[Ken Hechler]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in West Virginia|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Ken Hechler]]''' (Democratic) 59.7%
* {{Party stripe|Republican Party (US)}}Harry D. Humphreys (Republican) 40.3%
}}

|-
! {{Ushr|West Virginia|5|X}}
| [[James Kee]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in West Virginia|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[James Kee]]''' (Democratic) 63.6%
* {{Party stripe|Republican Party (US)}}Elizabeth Ann Bowen (Republican) 36.4%
}}

|}

== Wisconsin ==
<!--{{Main|1966 United States House of Representatives elections in Wisconsin}}-->
{{See also|List of United States representatives from Wisconsin}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Wisconsin|1|X}}
| [[Lynn E. Stalbaum]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Wisconsin|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Henry C. Schadeberg]]''' (Republican) 51.0%
* {{Party stripe|Democratic Party (US)}}[[Lynn E. Stalbaum]] (Democratic) 49.0%
}}

|-
! {{Ushr|Wisconsin|2|X}}
| [[Robert Kastenmeier]]
| {{Party shading/Democratic}} | Democratic
| [[1958 United States House of Representatives elections in Wisconsin|1958]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Robert Kastenmeier]]''' (Democratic) 58.0%
* {{Party stripe|Republican Party (US)}}William B. Smith (Republican) 42.0%
}}

|-
! {{Ushr|Wisconsin|3|X}}
| [[Vernon W. Thomson]]
| {{Party shading/Republican}} | Republican
| [[1960 United States House of Representatives elections in Wisconsin|1960]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Vernon W. Thomson]]''' (Republican) 68.8%
* {{Party stripe|Democratic Party (US)}}John D. Rice (Democratic) 31.2%
}}

|-
! {{Ushr|Wisconsin|4|X}}
| [[Clement Zablocki]]
| {{Party shading/Democratic}} | Democratic
| [[1948 United States House of Representatives elections in Wisconsin|1948]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Clement Zablocki]]''' (Democratic) 74.3%
* {{Party stripe|Republican Party (US)}}James E. Laessig (Republican) 25.7%
}}

|-
! {{Ushr|Wisconsin|5|X}}
| [[Henry S. Reuss]]
| {{Party shading/Democratic}} | Democratic
| [[1954 United States House of Representatives elections in Wisconsin|1954]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Democratic Party (US)}}{{Aye}} '''[[Henry S. Reuss]]''' (Democratic) 70.0%
* {{Party stripe|Republican Party (US)}}Curtis T. Pechtel (Republican) 29.7%
* {{Party stripe|Independent}}James E. Boulton (Independent) 0.3%
}}

|-
! {{Ushr|Wisconsin|6|X}}
| [[John Abner Race]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives elections in Wisconsin|1964]]
| {{Party shading/Republican}} | Incumbent lost re-election.<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William A. Steiger]]''' (Republican) 52.4%
* {{Party stripe|Democratic Party (US)}}[[John Abner Race]] (Democratic) 47.6%
}}

|-
! {{Ushr|Wisconsin|7|X}}
| [[Melvin Laird]]
| {{Party shading/Republican}} | Republican
| [[1952 United States House of Representatives elections in Wisconsin|1952]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Melvin Laird]]''' (Republican) 65.1%
* {{Party stripe|Democratic Party (US)}}[[Norman Myhra]] (Democratic) 34.9%
}}

|-
! {{Ushr|Wisconsin|8|X}}
| [[John W. Byrnes]]
| {{Party shading/Republican}} | Republican
| [[1944 United States House of Representatives elections in Wisconsin|1944]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[John W. Byrnes]]''' (Republican) 61.3%
* {{Party stripe|Democratic Party (US)}}Marvin S. Kagen (Democratic) 38.7%
}}

|-
! {{Ushr|Wisconsin|9|X}}
| [[Glenn Robert Davis]]
| {{Party shading/Republican}} | Republican
| [[1947 Wisconsin's 2nd congressional district special election|1947 {{Small|(special)}}]]<br/>1956 {{Small|(retired)}}<br/>[[1964 United States House of Representatives elections in Wisconsin|1964]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Glenn Robert Davis]]''' (Republican) 64.1%
* {{Party stripe|Democratic Party (US)}}James P. Buckley (Democratic) 35.9%
}}

|-
! {{Ushr|Wisconsin|10|X}}
| [[Alvin O'Konski]]
| {{Party shading/Republican}} | Republican
| [[1942 United States House of Representatives elections in Wisconsin|1942]]
| Incumbent re-elected.
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[Alvin O'Konski]]''' (Republican) 66.5%
* {{Party stripe|Democratic Party (US)}}[[Carl Lauri]] (Democratic) 33.5%
}}

|}

== Wyoming ==
<!--{{Main|1966 United States House of Representatives election in Wyoming}}-->
{{See also|List of United States representatives from Wyoming}}

{{USCongressElectionTableHead}}

|-
! {{Ushr|Wyoming|AL|X}}
| [[Teno Roncalio]]
| {{Party shading/Democratic}} | Democratic
| [[1964 United States House of Representatives election in Wyoming|1964]]
| {{Party shading/Republican}} | Incumbent retired to [[1966 United States Senate election in Wyoming|run for U.S. Senator]].<br/>'''Republican gain.'''
| nowrap | {{Plainlist|
* {{Party stripe|Republican Party (US)}}{{Aye}} '''[[William Henry Harrison III]]''' (Republican) 52.7%
* {{Party stripe|Democratic Party (US)}}Al Christian (Democratic) 47.3%
}}

|}

==See also==
* [[1966 United States elections]]
** [[1966 United States gubernatorial elections]]
** [[1966 United States Senate elections]]
* [[89th United States Congress]]
* [[90th United States Congress]]

==References==
{{Reflist}}

==Works cited==
* {{cite book|last1=Abramson |first1=Paul |last2=Aldrich |first2=John |last3=Rohde |first3=David |title=Change and Continuity in the 1992 Elections |publisher=[[CQ Press]] |date=1995 |isbn=0871878399}}

==Further reading==
* {{Party stripe|22nd ed., 1967 Party (US)}}"1966 Elections–A Major Republican Comeback." in ''CQ Almanac 1966'' (22nd ed., 1967) pp 1387–88. [http://library.cqpress.com/cqalmanac/cqal66-1299950 online]
* {{Cite journal |last1=Anderson |first1=Totton J. |last2=Lee |first2=Eugene C. |date=1967 |title=The 1966 Election in California |journal=The Western Political Quarterly |volume=20 |issue=2 |pages=535–554 |doi=10.2307/446081 |issn=0043-4078|jstor=446081 }}, plus articles on the other western states in the same issue
* {{Cite book | publisher=Congressional Quarterly | title= 1946 Congressional elections| year=1998}}
* {{Cite journal | last=Erikson | first=Robert J. | title=Malapportionment, Gerrymandering, and Party Fortunes in Congressional Elections | journal=American Political Science Review | volume=66 | year=1972 | issue=12–38| pages=1234–1245 | doi=10.2307/1957176 | jstor=1957176 | s2cid=145806972 }}, Focus on 1966
* {{Cite journal | last=Hathorn | first=Billy | title=The Frustration of Opportunity: Georgia Republicans and the Election of 1966 | journal=[[Atlanta History: A Journal of Georgia and the South]] | year=1987–1988 | volume=31 | issue=4 | pages=37–52}}
* {{Party stripe|2019 Party (US)}}McLay, Mark. "A High-Wire Crusade: Republicans and the War on Poverty, 1966." ''Journal of Policy History'' 31.3 (2019): 382–405.
* {{Cite journal |last1=Sullivan |first1=John L. |last2=O'Connor |first2=Robert E. |date=1972 |title=Electoral Choice and Popular Control of Public Policy: The Case of the 1966 House Elections |journal=The American Political Science Review |volume=66 |issue=4 |pages=1256–1268 |doi=10.2307/1957178 |issn=0003-0554|jstor=1957178 |s2cid=147328869 }}
{{1966 United States elections}}
{{United States House of Representatives elections}}
{{Gerald Ford}}
{{George H. W. Bush}}

[[Category:1966 United States House of Representatives elections| ]]
[[Category:Presidency of Lyndon B. Johnson]]
[[Category:George H. W. Bush]]
[[Category:Gerald Ford]]
[[Category:John Conyers]]
[[Category:John Dingell]]
[[Category:United States in the Vietnam War]]
[[Category:Jamie Whitten]]