View source for Washington–Baltimore combined statistical area

{{Infobox settlement
| name                   = Washington–Baltimore<br>combined statistical area
| official_name          = Washington–Baltimore–Arlington,<br>DC–VA–MD–WV–PA Combined Statistical Area
| settlement_type        = [[Combined Statistical Area]]
| image_skyline          = {{Multiple image
|perrow= 1/1/1
| caption_align          = center
| total_width            = 310
|border=infobox
| image1= National mall facing east.jpg
| caption1= [[National Mall]] in [[Washington, D.C.]]
| image2= Baltimore Harbor from rest.jpg
| caption2= [[Inner Harbor]] in [[Baltimore]]
| image3= Rosslyn_aerial_view,_September_2018.JPG
| caption3= Skyline of [[Rosslyn, Virginia|Rosslyn]] in [[Arlington County, Virginia|Arlington County]]
}}
| image_map          = {{maplink|frame=yes|plain=yes|frame-align=center|frame-width=290|frame-height=240|zoom=7|frame-coord={{coord|38.9000|-77.0000}}
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| type2=shape|id2=Q107126|title2=Arlington County, VA|stroke-color2=#720000|stroke-width2=0.5|fill2=#720000|fill-opacity2=0.4
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| type13=shape|id13=Q88|title13=City of Alexandria, VA|stroke-color13=#720000|stroke-width13=0.5|fill13=#720000|fill-opacity13=0.4
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| type20=shape|id20=Q501319|title20=Charles County, MD|stroke-color20=#720000|stroke-width20=0.5|fill20=#720000|fill-opacity20=0.4
| type21=shape|id21=Q501345|title21=Frederick County, MD|stroke-color21=#720000|stroke-width21=0.5|fill21=#720000|fill-opacity21=0.4
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| type28=shape|id28=Q398939|title28=Howard County, MD|stroke-color28=#0003FF|stroke-width28=0.5|fill28=#0003FF|fill-opacity28=0.4
| type29=shape|id29=Q511150|title29=Queen Anne's County, MD|stroke-color29=#0003FF|stroke-width29=0.5|fill29=#0003FF|fill-opacity29=0.4
| type30=shape|id30=Q5092|title30=City of Baltimore, MD|stroke-color30=#FF0000|stroke-width30=0.5|fill30=#FF0000|fill-opacity30=0.4
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| type37=shape|id37=Q502021|title37=Frederick County, VA|stroke-color37=#FF007F|stroke-width37=0.5|fill37=#FF007F|fill-opacity37=0.4
| type38=shape|id38=Q493610|title38=Hampshire County, WV, VA|stroke-color38=#FF007F|stroke-width38=0.5|fill38=#FF007F|fill-opacity38=0.4
| type39=shape|id39=Q492355|title39=City of Winchester, VA|stroke-color39=#FF007F|stroke-width39=0.5|fill39=#FF007F|fill-opacity39=0.4
| type40=shape|id40=Q511084|title40=Talbot County, MD|stroke-color40=#00BCE4|stroke-width40=0.5|fill40=#00BCE4|fill-opacity40=0.4
| type41=shape|id41=Q506225|title41=Orange County, VA|stroke-color41=#FF9200|stroke-width41=0.5|fill41=#FF9200|fill-opacity41=0.4
| type42=shape|id42=Q501263|title42=Dorchester County, MD|stroke-color42=#00FF40|stroke-width42=0.5|fill42=#00FF40|fill-opacity42=0.4
}}
| map_alt                 = Map of Washington–Baltimore Area
| map_caption             = Interactive Map of Washington–Baltimore–Arlington,<br>DC–VA–MD–WV–PA [[Combined Statistical Area|CSA]]
{{Col-begin}}
{{Col-break}}
{{leftlegend|#156000|[[Washington, DC]]}}
{{leftlegend|#FF0000|[[Baltimore, Maryland|Baltimore, MD]]}}
{{leftlegend|#C39290|Washington–Arlington–Alexandria [[Metropolitan Statistical Area|MSA]]}}
{{leftlegend|#0003FF|Baltimore–Columbia–Towson, MD MSA}}
{{leftlegend|#CC7910|Hagerstown–Martinsburg, MD–WV MSA}}
{{leftlegend|#BD00C8|Lexington Park, MD MSA}}
{{leftlegend|#059142|Chambersburg, PA MSA}}
{{leftlegend|#FF007F|Winchester, VA–WV MSA}}
{{leftlegend|#00BCE4|Easton, MD [[μSA]]}}
{{leftlegend|#FF9200|Lake of the Woods, VA μSA}}
{{leftlegend|#00FF40|Cambridge, MD μSA}}
{{Col-end}}
| coordinates        = {{coord|38.97|-77.32|type:city_region:US|display=title,inline}}
| subdivision_type        = [[List of sovereign states|Country]]
| subdivision_name        = [[United States]]
| subdivision_type1       = State or area
| subdivision_name1       = *[[Washington, D.C.]]
*[[Maryland]]
*[[Virginia]]
*[[West Virginia]]
*[[Pennsylvania]]
| subdivision_type2       = Constituent metropolitan & micropolitan areas
| subdivision_name2       = Core areas:
*[[Washington Metropolitan Area]]
*[[Baltimore Metropolitan Area]]
----
Outlying areas:
*[[Hagerstown metropolitan area|Hagerstown–Martinsburg Metropolitan Area]]
*[[St. Mary's County, Maryland|California–Lexington Park, Maryland Metropolitan Area]]
*[[Franklin County, Pennsylvania|Chambersburg–Waynesboro, PA Metropolitan Area]]
*[[Winchester, VA–WV MSA|Winchester, Virginia–West Virginia Metropolitan Area]]
*[[Talbot County, Maryland|Easton, Maryland Micropolitan Area]]
*[[Orange County, Virginia|Lake of the Woods, Virginia Micropolitan Area]]
*[[Dorchester County, Maryland|Cambridge, Maryland Micropolitan Area]]
| subdivision_type3      = Principal cities
| subdivision_name3      = {{ubl|[[Washington, D.C.]]
|In Maryland: {{ubl|[[Baltimore]]|[[Annapolis, Maryland|Annapolis]]|[[Bethesda, Maryland|Bethesda]]|[[Bowie, Maryland|Bowie]]|[[Columbia, Maryland|Columbia]]|[[Easton, Maryland|Easton]]|[[Frederick, Maryland|Frederick]]|[[Gaithersburg, Maryland|Gaithersburg]]|[[Hagerstown, Maryland|Hagerstown]]|[[Lexington Park, Maryland|Lexington Park]]|[[Rockville, Maryland|Rockville]]|[[Silver Spring, Maryland|Silver Spring]]|[[Towson, Maryland|Towson]]}}
|In Pennsylvania: {{ubl|[[Chambersburg, Pennsylvania|Chambersburg]]|[[Waynesboro, Pennsylvania|Waynesboro]]}}
|In Virginia: {{ubl|[[Arlington, Virginia|Arlington]]|[[Alexandria, Virginia|Alexandria]] |[[Fairfax, Virginia|Fairfax]]|[[Falls Church, Virginia|Falls Church]]|[[Fredericksburg, Virginia|Fredericksburg]]|[[Manassas, Virginia|Manassas]]|[[Manassas Park, Virginia|Manassas Park]]|[[Reston, Virginia|Reston]]|[[Tysons, Virginia|Tysons]]|[[Winchester, Virginia|Winchester]]}}
|In West Virginia: {{ubl|[[Martinsburg, West Virginia|Martinsburg]]}}
}}
| unit_pref               = 
| area_footnotes          = 
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| area_total_sq_mi        = 
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| area_land_sq_mi         = 
| area_water_km2          = 
| area_water_sq_mi        = 
| area_water_percent      = 
| area_urban_km2          = 
| area_urban_sq_mi        = 
| area_metro_km2          = 
| area_metro_sq_mi        = 
| area_blank1_title       = 
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| elevation_footnotes     = 
| elevation_m             = 
| elevation_ft            = 
| population_total        = 
| population_as_of        = 2023
| population_footnotes    = 
| population_density_km2  = 
| population_density_sq_mi = 
| population_urban        = 
| population_density_urban_km2 = 
| population_density_urban_sq_mi = 
| population_metro        = 
| population_density_metro_km2 = 
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| population_blank1_title = 
| population_blank1       = 
| population_density_blank1_km2 = 
| population_density_blank1_sq_mi = 
| population_blank2_title = [[Combined statistical area|CSA]]
| population_blank2       = 10069592 ([[Table of United States Combined Statistical Areas|3rd]])
| population_note         = 
| area_blank1_mi2         = 
| demographics_type2       = GDP
| demographics2_footnotes  = <ref>{{Cite web|title=Gross Domestic Product by County and Metropolitan Area|url=https://fred.stlouisfed.org/release?rid=397|work=[[Federal Reserve Economic Data]] |publisher=[[Federal Reserve Bank of St. Louis]]}}</ref>
|demographics2_title1     = CSA
|demographics2_info1      = $941.502 billion (2022){{failed verification|date=September 2024}}
| timezone                = [[Eastern Time Zone|EST]]
| utc_offset              = -5
| timezone_DST            = [[Eastern Daylight Time|EDT]]
| utc_offset_DST          = -4
| area_code               = [[Area codes 202 and 771|202/771]], [[Area codes 301, 240, and 227|301/240/227]], [[Area codes 304 and 681|304/681]], [[Area codes 410, 443, and 667|410/443/667]], [[Area codes 540 and 826|540/826]], [[Area codes 703 and 571|703/571]], [[Area codes 717 and 223|717/223]]
| area_code_type     = [[North American Numbering Plan|Area codes]]
| website                 =
| footnotes               =
}}

[[File:Map of Washington-Baltimore-Arlington CSA, 2012.jpg|right|upright=1.6|thumb|Map of the 2012 [[Office of Management and Budget|OMB]]-designated Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area.]]{{Redirect2|Baltimore-Washington|Baltwash|the highway linking the two cities|Baltimore–Washington Parkway|the airport|Baltimore/Washington International Airport}}
The '''Washington–Baltimore combined metropolitan statistical area''' is a [[combined statistical area|statistical area]], including the overlapping metropolitan areas of [[Washington metropolitan area|Washington, D.C.]] and [[Baltimore metropolitan area|Baltimore]]. The region includes Central [[Maryland]], [[Northern Virginia]], three counties in the [[Eastern Panhandle of West Virginia]], and [[Franklin County, Pennsylvania|one county]] in south-central [[Pennsylvania]]. It is the most educated, highest-income, and [[Table of United States Combined Statistical Areas|third-most populous combined statistical area]] in the United States behind [[New York metropolitan area|New York City–Newark, NJ]] and [[Greater Los Angeles|Los Angeles–Long Beach]].<ref>{{cite web|url=http://www.greaterbaltimore.org/tabid/534/Default.aspx|title=CSA Median household income|website=Greaterbaltimore.org|access-date=16 November 2017|archive-url=https://web.archive.org/web/20121207060434/http://www.greaterbaltimore.org/tabid/534/Default.aspx|archive-date=7 December 2012|url-status=dead|df=dmy-all}}</ref><ref>{{cite web|url=http://triangle.bizjournals.com/triangle/stories/2009/09/21/daily23.html?ana=tt3245|title=Raleigh-Durham area ranks third in U.S. for college degrees|website=Triangle.bizjournals.com|access-date=16 November 2017}}</ref>

The area is designated by the [[Office of Management and Budget]] (OMB) as the '''Washington–Baltimore–Arlington, DC–MD–VA–WV–PA Combined Statistical Area'''. It is composed primarily of two major [[metropolitan statistical area]]s (MSAs), the [[Washington metropolitan area|Washington–Arlington–Alexandria, DC–VA–MD–WV]] MSA and the [[Baltimore metropolitan area|Baltimore–Columbia–Towson, Maryland]] Metropolitan Statistical Area. Five smaller urban areas not contiguous to the main urban area but having strong commuting ties with the main area are included in the metropolitan area:<ref name="OMB_20180914">[https://bidenwhitehouse.archives.gov/wp-content/uploads/2018/09/Bulletin-18-04.pdf "OMB BULLETIN NO. 18-04: Revised Delineations of Metropolitan Statistical Areas, Micropolitan Statistical Areas, and Combined Statistical Areas, and Guidance on Uses of the Delineations of These Areas"]. Office of Management and Budget. September 14, 2018.</ref>[[Hagerstown metropolitan area|Hagerstown–Martinsburg, Maryland–West Virginia]] MSA, the [[Franklin County, Pennsylvania|Chambersburg–Waynesboro, Pennsylvania]] MSA, the [[Winchester, VA–WV MSA]], the [[St. Mary's County, Maryland|California–Lexington Park, Maryland]] MSA, and the [[Talbot County, Maryland|Easton, Maryland]] [[micropolitan statistical area]] (μSA).

Some counties, such as [[Caroline County, Virginia|Caroline]] and [[King George County, Virginia]], are not officially designated by OMB as members of this metropolitan area but still consider themselves members anyway.<ref>{{cite web|url=http://www.visitcaroline.com/economic.html|title=Caroline County Economic Development|access-date=2015-07-21|url-status=dead|archive-url=https://web.archive.org/web/20150711100558/http://www.visitcaroline.com/economic.html|archive-date=2015-07-11}}</ref><ref>{{cite web|url=http://washingtondcsouth.com/|title=Washington DC South|website=washingtondcsouth.com|access-date=16 November 2017}}</ref><ref>{{cite web|url=http://www.yeskinggeorge.com/|title=King George County Department of Economic Development|website=King George County Department of Economic Development|access-date=16 November 2017}}</ref><ref>{{cite web|url=https://www.washingtonpost.com/wp-dyn/content/article/2006/03/15/AR2006031502563.html|title=3 Virginia Exurbs Near Top of U.S. in Growth|first=D'Vera Cohn and Amy|last=Gardner|date=16 March 2006|access-date=16 November 2017|website=Washingtonpost.com}}</ref><ref>{{cite web|url=http://www.fampo.gwregion.org/about/fampo/|title=FAMPO Technical Committee – FAMPO|website=Fampo.gwregion.org|access-date=16 November 2017}}</ref> This is mostly due to their proximity to the area, the size of their commuter population, and by the influence of local broadcasting stations. The population of the entire Washington–Baltimore Combined Statistical Area as of the [[2020 United States census|2020 census]] was 9,973,383. The area's most-populous city is Washington, D.C. with a population of 689,545, and the area's most populous county is [[Fairfax County, Virginia]], with a population of 1,150,309.<ref name="census2020csa">{{cite web|publisher=[[U.S. Census Bureau]]|date=August 12, 2021|url=https://www.census.gov/library/visualizations/interactive/2020-population-and-housing-state-data.html|title=2020 Population and Housing State Data|access-date=September 5, 2021}}</ref>

== Components of the combined statistical area ==
The counties and independent cities and their groupings that comprise the area are listed below with their 2012 population estimates. Central counties/cities (designated as such by OMB) for each MSA are shown in italics.
* '''Washington–Arlington–Alexandria, DC–VA–MD–WV Metropolitan Area (5,860,342)'''<br />{{Main|Washington metropolitan area}}
** Arlington–Alexandria–Reston, VA–WV Metropolitan Division
*** ''[[Arlington County, Virginia]]''
*** [[Clarke County, Virginia]]
*** [[Culpeper County, Virginia]]
*** ''[[Fairfax County, Virginia]]''
*** [[Fauquier County, Virginia]]
*** ''[[Loudoun County, Virginia]]''
*** ''[[Prince William County, Virginia]]''
*** [[Rappahannock County, Virginia]]
*** [[Spotsylvania County, Virginia]]
*** ''[[Stafford County, Virginia]]''
*** [[Warren County, Virginia]]
*** ''[[Alexandria, Virginia]]''
*** ''[[Fairfax, Virginia]]''
*** ''[[Falls Church, Virginia]]''
*** [[Fredericksburg, Virginia]]
*** ''[[Manassas, Virginia]]''
*** ''[[Manassas Park, Virginia]]''
*** [[Jefferson County, West Virginia]]
** Frederick–Gaithersburg–Bethesda, MD Metropolitan Division (1,244,291)
*** [[Frederick County, Maryland]]
*** ''[[Montgomery County, Maryland]]''
** Washington, DC–MD Metropolitan Division (4,616,051)
*** ''[[Washington, District of Columbia]]''
*** [[Charles County, Maryland]]
*** ''[[Prince George's County, Maryland]]''
* '''Baltimore–Columbia–Towson, MD Metropolitan Area (2,753,149)'''<br />{{Main|Baltimore metropolitan area}}
** ''[[Baltimore, Maryland|Baltimore City]]''
** ''[[Anne Arundel County, Maryland|Anne Arundel County]]''
** ''[[Baltimore County, Maryland|Baltimore County]]''
** [[Carroll County, Maryland|Carroll County]]
** [[Harford County, Maryland|Harford County]]
** ''[[Howard County, Maryland|Howard County]]''
** ''[[Queen Anne's County, Maryland|Queen Anne's County]]''
* '''Hagerstown–Martinsburg, MD–WV Metropolitan Area (256,278)'''<br />{{main|Hagerstown metropolitan area}}
** ''[[Washington County, Maryland]]''
** ''[[Berkeley County, West Virginia]]''
** [[Morgan County, West Virginia]]
* '''Chambersburg, PA Metropolitan Area (151,275)'''
** ''[[Franklin County, Pennsylvania]]''
* '''Winchester, VA–WV Metropolitan Area (130,907)'''<br />{{main|Winchester, VA–WV MSA}}
** ''[[Frederick County, Virginia]]''
** ''[[Winchester, Virginia|Winchester city, Virginia]]''
** [[Hampshire County, West Virginia]]
* '''California–Lexington Park, MD Metropolitan Area (108,987)'''
** ''[[Calvert County, Maryland|Calvert County]]''
** ''[[St. Mary's County, Maryland|St. Mary's County]]''
* '''Easton, MD Micropolitan Area (38,098)'''
** ''[[Talbot County, Maryland]]''
* '''Lake of the Woods, VA Micropolitan Area'''
** ''[[Orange County, Virginia]]''
* '''Cambridge, MD Micropolitan Area'''
** ''[[Dorchester County, Maryland]]''

== Regional organizations ==

===Metropolitan Washington Council of Governments===
{{Main|Metropolitan Washington Council of Governments}}
Founded in 1957, the [[Metropolitan Washington Council of Governments]] (MWCOG) is a regional organization of 23 Washington-area local governments, members of the [[Maryland General Assembly|Maryland]] and [[Virginia General Assembly|Virginia]] state legislatures, the [[United States Senate|U.S. Senate]], and the [[United States House of Representatives|U.S. House of Representatives]]. MWCOG provides a forum for discussion and the development of regional responses to issues regarding the environment, transportation, public safety, homeland security, affordable housing, community planning, and economic development.<ref>{{cite web|url=http://www.mwcog.org/about/|title=COG & Our Region - Metropolitan Washington Council of Governments|website=Mwcog.org|access-date=16 November 2017}}</ref>

The National Capital Region Transportation Planning Board, a component of MWCOG, is the federally designated [[Metropolitan Planning Organization]] for the metropolitan Washington area.<ref>{{cite web|url=http://www.mwcog.org/transportation/tpb/|title=Transportation Planning Board - Transportation - Metropolitan Washington Council of Governments|website=Mwcog.org|access-date=16 November 2017}}</ref>

=== Baltimore Metropolitan Council ===
The Baltimore Metropolitan Council is the equivalent organization for the Baltimore portion of the combined Baltimore–Washington metropolitan area.<ref>{{cite web|url=http://www.baltometro.org/|title=Home - Baltimore Metropolitan Council|first=__Sara Ann|last=O'Leary|website=Baltometro.org|access-date=16 November 2017}}</ref> The BMC, which was created in 1992 as the successor to the Regional Planning Council and Baltimore Regional Council of Governments, consists of the Baltimore region's elected executives, representing Baltimore City and Anne Arundel, Baltimore, Carroll, Harford and Howard counties.<ref name="baltometro.org">[http://www.baltometro.org/content/view/6/65/ About BMC – Baltimore Metropolitan Council] {{webarchive|url=https://web.archive.org/web/20070501095325/http://www.baltometro.org/content/view/6/65/ |date=2007-05-01 }}</ref>

The Baltimore Regional Transportation Board is the federally recognized Metropolitan Planning Organization for transportation planning in the [[Baltimore]] region.<ref name="baltometro.org" />

==Principal cities==
{{original research|section|date=July 2023}}
{{hatnote|For a full list, see [[List of cities in the Baltimore–Washington metropolitan area]].<ref>{{cite web|url=https://www.census.gov/population/www/metroareas/lists/2007/List2.txt|title=U.S. Census Bureau – Principal cities of metropolitan and micropolitan statistical areas|website=Census.gov|access-date=16 November 2017}}</ref>}}

===Major cities===
*[[Baltimore]], Maryland
*[[Washington, D.C.]]

===Baltimore area===
* '''[[Baltimore]]'''
* [[Aberdeen, Maryland]]
* [[Annapolis, Maryland]]
* [[Arbutus, Maryland]]
* [[Bel Air, Maryland]]
* [[Brooklyn, Baltimore|Brooklyn, Maryland]]
* [[Brooklyn Park, Maryland]]
* [[Catonsville, Maryland]]
* [[Cockeysville, Maryland]]
* [[Columbia, Maryland]]
* [[Curtis Bay, Baltimore|Curtis Bay, Maryland]]
* [[Dundalk, Maryland]]
* [[Eldersburg, Maryland]]
* [[Elkridge, Maryland]]
* [[Ellicott City, Maryland]]
* [[Essex, Maryland]]
* [[Fullerton, Maryland]]
* [[Glen Burnie, Maryland]]
* [[Halethorpe, Maryland]]
* [[Linthicum, Maryland]]
* [[Lutherville-Timonium, Maryland]]
* [[Middle River, Maryland]]
*[[North Laurel, Maryland]]
* [[Owings Mills, Maryland]]
* [[Overlea, Maryland]]
* [[Parkville, Maryland]]
* [[Pasadena, Maryland]]
* [[Perry Hall, Maryland]]
* [[Pikesville, Maryland]]
* [[Randallstown, Maryland]]
* [[Reisterstown, Maryland]]
*[[Savage, Maryland]]
* [[Severna Park, Maryland]]
* [[Towson, Maryland]]
* [[Westminster, Maryland]]
* [[Woodlawn, Baltimore County, Maryland|Woodlawn, Maryland]]

===Washington, D.C. area===
* '''[[Washington, D.C.]]'''
* [[Bethesda, Maryland]]
* [[Bowie, Maryland]]
* [[Chevy Chase, Maryland]]
* [[College Park, Maryland]]
* [[Frederick, Maryland]]
* [[Gaithersburg, Maryland]]
* [[Germantown, Maryland]]
* [[Greenbelt, Maryland]]
* [[Laurel, Maryland]]
* [[Potomac, Maryland]]
* [[Rockville, Maryland]]
* [[Silver Spring, Maryland]]
* [[Upper Marlboro, Maryland]]
* [[Alexandria, Virginia]]
* [[Annandale, Virginia]]
* [[Arlington, Virginia]]
* [[Ashburn, Virginia]]
* [[Chantilly, Virginia]]
* [[Fairfax, Virginia]]
* [[Falls Church, Virginia]]
* [[Fredericksburg, Virginia]]
* [[Great Falls, Virginia]]
* [[Herndon, Virginia]]
* [[Langley, Virginia]]
* [[Leesburg, Virginia]]
* [[Manassas, Virginia]]
* [[Manassas Park, Virginia]]
* [[Massaponax, Virginia]]
* [[McLean, Virginia]]
* [[Mt. Vernon, Virginia]]
* [[Reston, Virginia]]
* [[Springfield, Virginia]]
* [[Tysons, Virginia]]
* [[Vienna, Virginia]]

===Outlying areas===
* [[California, Maryland]]
* [[Cambridge, Maryland]]
* [[Centreville, Maryland]]
* [[Easton, Maryland]] 
* [[Hagerstown, Maryland]]
* [[Hancock, Maryland]]
* [[Lexington Park, Maryland]]
* [[Thurmont, Maryland]]
* [[Chambersburg, Pennsylvania]]
* [[McConnellsburg, Pennsylvania]]
* [[Waynesboro, Pennsylvania]]
* [[Culpeper, Virginia]]
* [[Warrenton, Virginia]]
* [[Winchester, Virginia]]
* [[Charles Town, West Virginia]]
* [[Martinsburg, West Virginia]]<ref>{{cite web|url=https://www.census.gov/population/www/metroareas/lists/2007/List2.txt|title=Metropolitan And Micropolitan Statistical Areas And Principal Cities, November 2007, with codes|website=Census.gov|access-date=16 November 2017}}</ref>

== Economy ==
{{further information|Economy of the Washington metropolitan area}}
=== Primary industries ===

====Biotechnology====
Maryland's Washington suburbs are a major center for [[biotechnology]]. Prominent local biotechnology companies include [[MedImmune]], [[United Therapeutics]], [[The Institute for Genomic Research]], [[Human Genome Sciences]], and the [[Howard Hughes Medical Institute]].

==== Defense contracting ====
Many defense contractors are based in Northern Virginia and Montgomery County, Maryland to be close to [[the Pentagon]] in Arlington. Local defense contractors include [[Lockheed Martin]], the largest, as well as [[Northrop Grumman]], [[General Dynamics]], [[BAE Systems Inc.]], [[Computer Sciences Corporation]] (CSC), [[Booz Allen Hamilton]], [[Leidos]], [[Science Applications International Corporation]] (SAIC), [[Orbital Sciences Corporation]], and [[AAI Corporation]].

=== Notable company headquarters in the region ===
''Numbers denote [[Fortune 500]] ranking.''

==== Maryland ====
Baltimore area:
* [[AAI Corporation]] ([[Hunt Valley, Maryland|Hunt Valley]])
* [[Advertising.com]] ([[Baltimore]])
* [[Allegis Group]] ([[Hanover, Maryland|Hanover]])
* [[Black & Decker]] ([[Towson, Maryland|Towson]])
* [[Ciena]] Corporation ([[Hanover, Maryland|Hanover]])
* [[Colfax Corporation]] ([[Annapolis Junction, Maryland|Annapolis Junction]])
* [[Constellation Energy]] ([[Baltimore]]) 
* [[Corporate Office Properties Trust]] ([[Columbia, Maryland|Columbia]])
* [[The Cordish Companies]] ([[Baltimore]])
* [[CoverGirl]] ([[Hunt Valley, Maryland|Hunt Valley]])
* [[Fila (company)|Fila]] USA ([[Sparks, Maryland|Sparks]])
* [[Firaxis Games]] ([[Sparks, Maryland|Sparks]])
* [[First Friday's Group]] (Baltimore)
* [[Legg Mason]] ([[Baltimore]])
* [[McCormick & Company]] ([[Hunt Valley, Maryland|Hunt Valley]]) ''482''
* [[MICROS Systems]] ([[Columbia, Maryland|Columbia]])
* [[Millennial Media]] ([[Baltimore]])
* [[Nielsen Audio]] ([[Columbia, Maryland|Columbia]])
* [[Pandora Jewelry]] USA ([[Baltimore]])
* [[T. Rowe Price]] ([[Baltimore]]) ''447''
* [[Transamerica Corporation]] ([[Baltimore]])
* [[Sinclair Broadcast Group]] ([[Hunt Valley, Maryland|Hunt Valley]]) ''465''
* [[Sourcefire]] ([[Columbia, Maryland|Columbia]])
* [[Sylvan Learning]] ([[Baltimore]])
* [[Under Armour]] ([[Baltimore]])
* [[W.R. Grace & Co.]] ([[Columbia, Maryland|Columbia]])
* [[The Whiting-Turner Contracting Company]] ([[Towson, Maryland|Towson]])<ref>{{cite web|url=https://www.forbes.com/companies/whiting-turner-contracting/|title=Whiting-Turner Contracting on the Forbes America's Largest Private Companies List|website=Forbes.com|access-date=16 November 2017}}</ref>

Washington area:
* [[2U (company)]] ([[Lanham, Maryland]])
* [[ASRC Aerospace Corporation]] ([[Greenbelt, Maryland]])
* [[Bethesda Softworks]] ([[Rockville, Maryland|Rockville]])
* [[Clark Construction]] ([[Bethesda, Maryland|Bethesda]])
* [[Choice Hotels]] ([[Rockville, Maryland|Rockville]])
* [[Coventry Health Care]] ([[Bethesda, Maryland|Bethesda]])
* [[EagleBank]] ([[Bethesda, Maryland|Bethesda]])
* [[Enviva]] ([[Bethesda, Maryland|Bethesda]])
* [[Federal Realty Investment Trust]] ([[Rockville, Maryland|Rockville]])
* [[GEICO]] ([[Chevy Chase, Maryland|Chevy Chase]])
* [[Host Hotels & Resorts]] ([[Bethesda, Maryland|Bethesda]]) ''472''
* [[Hughes Network Systems]] ([[Germantown, Maryland|Germantown]])
* [[Inovalon]] ([[Bowie, Maryland]])
* [[JBG Smith]] ([[Chevy Chase, Maryland|Chevy Chase]])
* [[Lockheed Martin]] ([[Bethesda, Maryland|Bethesda]]) ''49''
* [[Marriott International]] ([[Bethesda, Maryland|Bethesda]]) ''293''
* [[MedImmune]] ([[Gaithersburg, Maryland|Gaithersburg]])
* [[New Enterprise Associates]] ([[Chevy Chase, Maryland|Chevy Chase]])
* [[Novavax]] ([[Gaithersburg, Maryland|Gaithersburg]])
* [[Radio One (company)|Radio One]] ([[Lanham, Maryland|Lanham]])
* [[Ritz-Carlton]] ([[Chevy Chase, Maryland|Chevy Chase]])
* [[Travel Channel]] ([[Chevy Chase, Maryland|Chevy Chase]])
* [[TV One (US TV network)|TV One]] ([[Silver Spring, Maryland|Silver Spring]])
* [[United Therapeutics]] ([[Silver Spring, Maryland|Silver Spring]])

==== Northern Virginia ====
{{Main|List of companies headquartered in Northern Virginia}}
* [[AES Corporation]] ([[Arlington County, Virginia|Arlington]]) ''194''
* [[Amazon HQ2| Amazon]] ([[Crystal City, Virginia|Crystal City]])
* [[Appian Corporation]] ([[Tysons Corner, Virginia|Tysons Corner]])
* [[AvalonBay Communities]] ([[Arlington County, Virginia|Arlington]])
* [[Airbus Group, Inc.|Airbus North America]] ([[Herndon, Virginia|Herndon]])
* [[BAE Systems Inc.]] ([[Arlington, Virginia|Arlington]])
* [[Bechtel]] ([[Reston, Virginia|Reston]])
* [[Bloomberg Industry Group]] ([[Arlington, Virginia|Arlington]])
* [[Boeing]] ([[Arlington County, Virginia|Arlington]]) ''58''<ref>{{Cite web |title=The Boeing Company: General Information |url=https://www.boeing.com/company/general-info/index.page#/overview |access-date=2023-07-31 |website=www.boeing.com}}</ref>
* [[Booz Allen Hamilton]] ([[McLean, Virginia|McLean]]) ''481''
* [[CACI]] ([[Arlington County, Virginia|Arlington]])
* [[Capital One]] ([[McLean, Virginia|McLean]]) ''100''
* [[Carfax (company)|Carfax]] ([[Centreville, Virginia]])
* [[Computer Sciences Corporation]] ([[Falls Church, Virginia|Falls Church]]) ''379''
* [[Communications Satellite Corporation]] ([[Herndon, Virginia|Herndon]])
* [[Comscore]] ([[Reston, Virginia|Reston]])
* [[Cvent]] ([[Tysons Corner, Virginia|Tysons Corner]]) 
* [[DynCorp International]] ([[Falls Church, Virginia|Falls Church]])
* [[Freddie Mac]] ([[McLean, Virginia|McLean]]) ''39''
* [[Fabrique Nationale de Herstal|FNH]] USA ([[Fredericksburg, Virginia|Fredericksburg]])
* [[FLIR Systems|FLIR Systems Government and Defense]] ([[Arlington County, Virginia|Arlington]]) 
* [[Graham Holdings]] ([[Arlington County, Virginia|Arlington]])
* [[Gannett Company]] ([[McLean, Virginia|McLean]])
* [[General Dynamics]] ([[Falls Church, Virginia|Falls Church]]) ''90''
* [[GTT Communications]] ([[Tysons Corner, Virginia|Tysons Corner]])
* [[Hilton Hotels Corporation]] ([[McLean, Virginia|McLean]]) ''241''
* [[ICF International]] ([[Fairfax, Virginia|Fairfax]])
* [[Iridium Communications]] ([[McLean, Virginia|McLean]])
* [[Stride, Inc.]] ([[Herndon, Virginia|Herndon]])
* [[KBR (company)|Kellogg Brown and Root Services]] ([[Arlington County, Virginia|Arlington]])
* [[Leidos]] ([[Reston, Virginia|Reston]]) ''381''
* [[Ligado Networks]] ([[Reston, Virginia|Reston]])
* [[Mars, Incorporated]] ([[McLean, Virginia|McLean]])
* [[M.C. Dean, Inc.]] ([[Dulles, Virginia|Dulles]])
* [[MicroStrategy]] ([[Tysons Corner, Virginia|Tysons Corner]])
* [[Naviance]] ([[Arlington County, Virginia|Arlington]])
* [[Navy Federal Credit Union]] ([[Vienna, Virginia|Vienna]])
* [[NII Holdings]] ([[Reston, Virginia|Reston]])
* [[Northrop Grumman]] ([[Falls Church, Virginia|Falls Church]]) ''114''
* [[NVR (homebuilding company)|NVR Incorporated]] ([[Reston, Virginia|Reston]]) ''446''
* [[Orbital Sciences Corporation|Orbital Sciences]] ([[Dulles, Virginia|Dulles]])
* [[Park Hotels & Resorts]] ([[Tysons Corner, Virginia|Tysons Corner]])
* [[Parsons Corporation]] ([[Centreville, Virginia|Centreville]])
* [[Rolls-Royce North America]] ([[Reston, Virginia|Reston]])
* [[Rosetta Stone (company)|Rosetta Stone]] ([[Arlington County, Virginia|Arlington]])
* [[Science Applications International Corporation]] ([[McLean, Virginia|McLean]])
* [[SLM Corporation]] ([[Reston, Virginia|Reston]]) "Sallie Mae" 
* [[Strategic Education, Inc.]] ([[Herndon, Virginia|Herndon]])
* [[Space Adventures]] ([[Vienna, Virginia|Vienna]])
* [[Tegna Inc.]] ([[Tysons Corner, Virginia|Tysons Corner]])
* [[The Motley Fool]] ([[Alexandria, Virginia]])
* [[The Teaching Company]] ([[Chantilly, Virginia|Chantilly]]) 
* [[Verisign]] ([[Reston, Virginia|Reston]])
* [[Verizon Business]] ([[Ashburn, Virginia|Ashburn]])
* [[Volkswagen Group of America]] ([[Herndon, Virginia|Herndon]])
* [[VSE Corporation]] ([[Alexandria, Virginia]])
* [[XO Communications]] ([[Herndon, Virginia|Herndon]])

==== Washington, D.C. ====
* [[&pizza]]
* [[APCO Worldwide]]
* [[Atlantic Media]]
* [[Black Entertainment Television]]
* [[Blackboard Inc.]]
* [[Bluemercury]]
* [[Carlyle Group]]
* [[Chemonics]]
* [[Cogent Communications]]
* [[CoStar Group]]
* [[Danaher Corporation]] ''239''
* [[Fannie Mae]] ''53''
* [[FiscalNote]]
* [[Framebridge]]
* [[Gallup (company)|Gallup]]
* [[Mapbox]]
* [[Morning Consult]]
* [[National Geographic Society]]
* [[NGP VAN]]
* [[Pepco Holdings]] ''279''
* [[Social Tables]]
* [[The Washington Post|The Washington Post Company]]
* [[Vox Media]]
* [[XM Satellite Radio]]

== Sports ==
[[File:M&T Bank Stadium Aerial 2022.jpg|thumb|[[M&T Bank Stadium]] in [[Baltimore]], home field of the [[Baltimore Ravens]] of the [[National Football League]]]]
===Table of professional teams and venues===
{| class="wikitable sortable"
|-
! Club !! Sport !! League !! Founded !! Venue
|-

| [[Washington Capitals]] || [[Ice hockey|Hockey]] || align=center|[[National Hockey League|NHL]] || 1974 || [[Capital One Arena]]<br>
|-
| [[Washington Nationals]] || [[Baseball]] || align=center|[[Major League Baseball|MLB]] || 2005{{efn|group=o|name=moved|Year team moved to current location}} || [[Nationals Park]]<br>
|-
| [[Baltimore Orioles]] || [[Baseball]] || align=center|[[Major League Baseball|MLB]] || 1954{{efn|group=o|name=moved}} || [[Oriole Park at Camden Yards]]<br>
|-
| [[Washington Wizards]] || [[Basketball]] || align=center|[[National Basketball Association|NBA]] || 1973{{efn|group=o|name=moved}} || [[Capital One Arena]]<br>
|-
| [[Baltimore Ravens]] || [[American football|Football]] || align=center|[[National Football League|NFL]] || 1996 || [[M&T Bank Stadium]]<br>
|-
| [[Washington Commanders]] || [[American football|Football]] || align=center|[[National Football League|NFL]] || 1937{{efn|group=o|name=moved}} || [[Northwest Field]]<br>
|-
| [[D.C. United]] || [[Association football|Soccer]] || align=center | [[Major League Soccer|MLS]] || 1996 || [[Audi Field]]<br>
|-
| [[Washington Mystics]] || [[Basketball]]|| align="center" |[[WNBA]] || 1998 || [[CareFirst Arena]]<br>
|-
| [[Washington Spirit]] || [[Association football|Soccer]]|| align="center" | [[National Women's Soccer League|NWSL]] || 2011{{efn|group=o|Founded as [[D.C. United Women]]; rebranded as Washington Spirit in 2012 and started NWSL play in 2013.}}  || [[Maryland SoccerPlex]] (primary)<br>[[Audi Field]] (secondary)<br>[[Segra Field]] (secondary)<br>
|-
| [[Maryland Whipsnakes]] || [[Lacrosse]]|| align="center" |[[Premier Lacrosse League|PLL]] || 2019 || [[Homewood Field]]<br>
|}

{{Notelist}}

== Transportation ==
{{Location map many|Maryland
|relief = 2
|caption = Location of commercial airports in the Washington-Baltimore combined statistical area
|label = IAD
|label_width = 9
|lat = 38.9515
|long = -77.4569
|position = left
|label2 = DCA
|label_width2 = 9
|lat2 = 38.8512
|long2 = -77.0402
|position2 = right
|label3 = BWI
|label_width3 = 9
|lat3 = 39.1794
|long3 = -76.6686
|position3 = right
|label4 = HGR
|label_width4 = 9
|lat4 = 39.7067
|long4 = -77.7302
|position4 = top
}}
[[File:Reagan Terminal B-C.JPG|thumb|[[Ronald Reagan Washington National Airport]] in [[Crystal City, Virginia]], the nation's 23rd-busiest airport and busiest airport in the Washington-Baltimore area]]
[[File:BWIA-BTerminal.JPG|thumb|[[Baltimore/Washington International Airport]] (BWI), the nation's 25th-busiest airport and second-busiest airport in the Washington-Baltimore area]]
[[File:Washington Dulles International Airport at Dusk.jpg|thumb|[[Dulles International Airport]], the nation's 28th-busiest airport and third-busiest airport in the Washington-Baltimore area]]
[[File:Metro Center upper level.jpg|thumb|[[Washington Metro]]]]
[[File:2019-06-28 11 46 49 View north along Interstate 495 (Capital Beltway) from the overpass for Virginia State Route 796 (Oak Street) on the edge of Idylwood and Dunn Loring in Fairfax County, Virginia.jpg|thumb|The [[Capital Beltway]] (I-495) in [[Northern Virginia]]]]
[[File:MTAMaryland178.jpg|thumb|[[Baltimore Metro SubwayLink]]]]
=== Commercial airports ===
{| class="wikitable"
|-
! valign=bottom | Airport
! valign=bottom | [[IATA airport code|IATA code]]
! valign=bottom | [[ICAO airport code|ICAO code]]
! valign=bottom | [[County (United States)|County]]
! valign=bottom | State
! valign=bottom | Note
|-
|[[Baltimore/Washington International Airport]]
|BWI
|KBWI
|[[Anne Arundel County]]
|[[Maryland]]
|The closest airport to [[Baltimore]] and region's busiest<ref name=":0">{{Cite web |date=2 October 2024 |title=Final CY23 Enplanements at All Commercial Service Airports |url=https://www.faa.gov/sites/faa.gov/files/2024-10/cy23-commercial-service-enplanements.pdf}}</ref> airport
|-
|[[Dulles International Airport]]
|IAD
|KIAD
|[[Loudoun County, Virginia|Loudoun County]]
|Virginia
|Most international traffic in region
|-
|[[Hagerstown Regional Airport]] 
|HGR 
|KHGR
|[[Washington County, Maryland|Washington County]]
| Maryland
| Serves [[Western Maryland]], the Eastern Panhandle of [[West Virginia]], and portions of south-central [[Pennsylvania]] and northwestern [[Virginia]] along the [[Interstate 81]] corridor
|-
|[[Ronald Reagan Washington National Airport]] 
|DCA 
|KDCA
|[[Arlington County, Virginia|Arlington County]]
| [[Virginia]]
| Region's second-busiest<ref name=":0" /> airport and its closest airport to [[Washington, D.C.]]
|-
|}

=== Rail transit systems ===

==== Intercity Rail ====
* [[Amtrak]]

==== Commuter/Regional Rail ====

* [[MARC Train]]
* [[Virginia Railway Express]]

==== Heavy Rail Subway ====

* [[Washington Metro]]
* [[Baltimore Metro SubwayLink|Baltimore Metro]] [[Baltimore Metro SubwayLink|SubwayLink]]

==== Light Rail ====
* [[Baltimore Light RailLink]]
* [[DC Streetcar]] (until 2026)<ref>{{Cite news |last=Weiner |first=Rachel |date=9 Oct 2025 |title=Budget cut means D.C. Streetcar will shut down in March |url=https://www.washingtonpost.com/dc-md-va/2025/10/09/streetcar-dc-shutdown-march/ |url-status=live |archive-url=https://archive.today/20251009150327/https://www.washingtonpost.com/dc-md-va/2025/10/09/streetcar-dc-shutdown-march/ |archive-date=9 Oct 2025 |access-date=20 Oct 2025 |work=The Washington Post}}</ref>
* ''[[Purple Line (Maryland)|Purple Line]]'' (under construction; projected opening 2027)

=== Major highways ===
'''Interstates'''
* [[File:I-66.svg|20px]] [[Interstate 66]]
* [[File:I-70.svg|20px]] [[Interstate 70]]
* [[File:I-81.svg|20px]] [[Interstate 81]]
* [[File:I-83.svg|20px]] [[Interstate 83]]
* [[File:I-95.svg|20px]] [[Interstate 95]]
* [[File:I-97.svg|20px]] [[Interstate 97]]
* [[File:I-195.svg|25px]] [[Interstate 195 (Maryland)|Interstate 195]]
* [[File:I-270.svg|25px]] [[Interstate 270 (Maryland)|Interstate 270]]
* [[File:I-295.svg|25px]] [[Interstate 295 (District of Columbia)|Interstate 295]]
* [[File:I-370.svg|25px]] [[Interstate 370]]
* [[File:I-395.svg|25px]] [[Interstate 395 (District of Columbia-Virginia)]]
* [[File:I-395.svg|25px]] [[Interstate 395 (Maryland)]]
* [[File:I-495.svg|25px]] [[Interstate 495 (Capital Beltway)|Interstate 495]] (Capital Beltway)
* [[File:I-595.svg|25px]] [[Interstate 595 (Maryland)|Interstate 595 (Unsigned)]]
* [[File:I-695.svg|25px]] [[Interstate 695 (District of Columbia)]]
* [[File:I-695.svg|25px]] [[Interstate 695 (Maryland)|Interstate 695]] (Baltimore Beltway)
* [[File:I-795.svg|25px]] [[Interstate 795 (Maryland)|Interstate 795]]
* [[File:I-895.svg|25px]] [[Interstate 895 (Maryland)|Interstate 895]]

'''U.S. Routes'''
* [[File:US 1.svg|20px]] [[U.S. Route 1]]
* [[File:US 11.svg|20px]] [[U.S. Route 11]]
* [[File:US 15.svg|20px]] [[U.S. Route 15]]
* [[File:US 29.svg|20px]] [[U.S. Route 29]]
* [[File:US 40.svg|20px]] [[U.S. Route 40]]
* [[File:US 50.svg|20px]] [[U.S. Route 50]]
* [[File:US 301.svg|25px]] [[U.S. Route 301]]
* [[File:US 340.svg|25px]] [[U.S. Route 340]]

'''State Routes'''
* [[File:DC-295.svg|frameless|25x25px]] [[District of Columbia Route 295]]{{Efn|Signed as a DC state route following the MD-295 interchange in Tuxedo.|group=note}} (Anacostia Freeway)
* [[File:MD Route 2.svg|20px]] [[Maryland Route 2]]
* [[File:MD Route 4.svg|20px]] [[Maryland Route 4]]
* [[File:MD Route 5.svg|20px]] [[Maryland Route 5]]
* [[File:MD Route 26.svg|20px]] [[Maryland Route 26]]
* [[File:MD Route 32.svg|20px]] [[Maryland Route 32]]
*[[File:MD Route 97.svg|20x20px]] [[Maryland Route 97]]
* [[File:MD Route 100.svg|25px]] [[Maryland Route 100]]
* [[File:MD Route 200.svg|25px]] [[Maryland Route 200]] (Intercounty Connector)
* [[File:MD Route 410.svg|frameless|25x25px]] [[Maryland Route 410]] (East-West Highway)
* [[File:MD Route 295.svg|25px]] [[Baltimore–Washington Parkway]]{{Efn|295 is maintained by the National Park Service south of MD-175, by the Baltimore Dept. of Transportation in city limits, and by the Maryland State Highway Department all other sections.|group=note}} (Maryland Route 295)
* [[File:MD Route 355.svg|25px]] [[Maryland Route 355]]
* [[File:Virginia 3.svg|20px]] [[Virginia State Route 3]]
* [[File:Virginia 7.svg|20px]] [[Virginia State Route 7]]
* [[File:Virginia 9.svg|20px]] [[Virginia State Route 9]]
* [[File:Virginia 28.svg|20px]] [[Virginia State Route 28]]
* [[File:Virginia 267.svg|25px]] [[Virginia State Route 267]]
* [[File:Virginia 286.svg|25px]] [[Virginia State Route 286]] (Fairfax County Parkway)
* [[File:Virginia 289.svg|25px]] [[Virginia State Route 289]] (Franconia–Springfield Parkway)
* [[File:WV-9.svg|20px]] [[West Virginia Route 9]]

==See also==
{{Portal|Baltimore|United States}}
* [[Beltway Series]]
* [[List of parks in the Baltimore–Washington metropolitan area]]
* [[National Capital Region (United States)|National Capital Region]]
* [[United States metropolitan area]]

== Notes ==
{{NoteFoot}}

==References==
{{Reflist}}

{{BaltimoreMetroArea}}
{{DCMetroArea}}
{{Northeast Megalopolis}}
{{District of Columbia}}
{{Maryland}}
{{Virginia}}
{{West Virginia}}
{{Pennsylvania}}

{{DEFAULTSORT:Baltimore-Washington metropolitan area}}
[[Category:Baltimore–Washington metropolitan area| ]]
[[Category:Baltimore metropolitan area]]
[[Category:Washington metropolitan area]]
[[Category:Geography of Baltimore]]
[[Category:Geography of Washington, D.C.]]
[[Category:Northern Virginia]]
[[Category:Regions of Maryland]]
[[Category:Regions of Virginia]]
[[Category:Regions of Pennsylvania]]
[[Category:Regions of West Virginia]]
[[Category:Northeast megalopolis]]