View source for Arlington County, Virginia

{{short description|County in Virginia, United States}}
{{redirect|Arlington, Virginia|the community in Northampton County|Arlington, Northampton County, Virginia}}
{{redirect2|Alexandria County|Alexandria County, Virginia|the city|Alexandria, Virginia}}
{{Use American English|date=June 2025}}
{{Use mdy dates|date=July 2024}}
{{Infobox U.S. county
| county               = Arlington County
| type                 = [[County (United States)|County]] and [[census-designated place]]
| official_name        = 
| state                = Virginia
| ex image             = {{multiple image
| total_width   = 300
| border        = infobox
| perrow        = 1/2/2/1
| caption_align = center
| image1        = Rosslyn Skyline from Theodore Roosevelt Bridge.png
| alt1          = Rosslyn
| caption1      = [[Rosslyn, Virginia|Rosslyn]]
| image2        = Arlington House.jpg
| alt2          = Arlington National Cemetery
| caption2      = [[Arlington National Cemetery]]
| image3        = Honorary Marine Daran Wankum, third from left, salutes during a wreath laying ceremony at the Marine Corps War Memorial in Arlington, Va, June 13, 2013 130613-M-KS211-013.jpg
| alt3          = Marine Corps War Memorial
| caption3      = [[Marine Corps War Memorial]]
| image4        = The Pentagon January 2008.jpg
| alt4          = The Pentagon
| caption4      = [[The Pentagon]]
| image5        = Members of the Marine Corps Executive Forum (MCEF) visit the U.S. Air Force Memorial in Arlington, Va, during a tour of the National Capital Region, July 8, 2011 110708-M-KS211-027.jpg
| alt5          = Air Force Memorial
| caption5      = [[United States Air Force Memorial|Air Force Memorial]]
| image6        = Ballston6365-091819.jpg
| alt6          = Ballston
| caption6      = [[Ballston, Virginia|Ballston]]
}}
| ex image size        = 300px
| ex image cap         = 
| flag                 = Flag of Arlington County, Virginia.svg
| flag size            = 
| flag border          = 
| flag wl              = 
| seal                 = 
| seal size            = 
| seal wl              = 
| logo                 = Logo of Arlington County, Virginia.png
| logo size            = 
| nickname             = 
| motto                = 
| coordinates          = {{coord|38.880278|-77.108333|type:city_region:|display=inline,title}}
| founded date         = February 27
| founded year         = 1801
| named for            = [[Arlington House, The Robert E. Lee Memorial|Arlington House]]
| seat wl              = Court House
| city type            = 
| largest city wl      = 
| other_cities         = 
| leader_title         = 
| leader_name          = 
| area_footnotes       = <ref name = "Arl Fast Facts">{{cite web |title=Arlington Fast Facts |url=https://www.arlingtonva.us/Government/Projects/Data-Research/Fast-Facts |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=31 July 2025}}</ref>
| area_total_sq_mi     = 26
| area_land_sq_mi      = 25.8
| area_water_sq_mi     = 0.2
| area percentage      = 0.7
| population_total     = 238,643 {{gain}}
| population_as_of     = 2020
| population_footnotes = <ref>{{cite web|url=https://www.census.gov/library/visualizations/interactive/2020-population-and-housing-state-data.html|title=2020 Population and Housing State Data|publisher=United States Census Bureau|access-date=August 14, 2021}}</ref>
| population_est       = 243,760 {{gain}}
| pop_est_as_of        = 2025
| pop_est_footnotes    = <ref name = "Arl Fast Facts"/>
| population_density_sq_mi = 9,375
| demonym              = 
| time zone            = Eastern
| tz note              = 
| ZIP codes            = 20001, 20301, 22201, 22202, 22203, 22204, 22205, 22206, 22207, 22209, 22211, 22213 <ref>{{cite web |title=Arlington County, Virginia: ZIP Code Boundaries |url=https://arlgis.arlingtonva.us/web_files/Maps/Standard_Maps/Zip_Codes.pdf |website=arlgis.arlingtonva.us |publisher=County of Arlington, Virginia |access-date=3 August 2025}}</ref>
| area codes           = 703, 571
| district             = 8th
| web                  = www.arlingtonva.us
| footnotes            = 
}}
'''Arlington County''', or simply '''Arlington''', is a [[County (United States)|county]] in the [[U.S. state]] of [[Virginia]]. The county, which is located in the [[Washington metropolitan area]] and the broader [[Northern Virginia]] region, is positioned directly across from [[Washington, D.C.]], the national capital, on the southwestern bank of the [[Potomac River]]. The smallest self-governing county in the United States by area, Arlington County has both suburban and urbanized districts. Its urbanized districts are located in proximity to several [[Washington Metro]] stations and lines. Its seat of government is located in the [[Court House, Virginia|Court House]] neighborhood, which hosts many of its administrative offices and county courthouse.

Originally part of the [[Nacotchtank]] tribe's territory prior to the establishment of the [[Colony of Virginia]] in 1606, English colonists began settling in Arlington by the 1670s; the area was eventually designated as part of [[Fairfax County, Virginia|Fairfax County]] in 1742. The colonial-era economy was mostly based in [[tobacco]] agriculture operated with [[Slavery in the colonial history of the United States|enslaved labor]] and [[Indentured servitude in British America|indentured servants]] on large [[Plantation complexes in the Southern United States|plantations]]. Following the end of the [[American Revolutionary War|Revolutionary War]], Arlington's [[Planter class|planters]] and [[yeoman]] farmers transitioned to other crops. Virginia ceded present-day Arlington to help form the District of Columbia, and from 1801 the area was known as '''Alexandria County'''; it was eventually retroceded back to Virginia in 1847 as a result of pressure from [[Alexandria, Virginia|Alexandria]], which was the county's primary commercial center.

During the [[American Civil War|Civil War]], Arlington formed part of the [[Union army|Union's]] [[Civil War Defenses of Washington|defenses of Washington]], which devastated its landscape and economy. Virginia's [[Reconstruction era]] [[Constitution of Virginia#1870|Constitution of 1870]], in addition to administratively separating Arlington from Alexandria, empowered its black community to participate in local and state elections, which changed the political dynamics of the county until local conservative [[Southern Democrats]] succeeded in reestablishing [[white supremacy]] by the 1880s. This facilitated the institution of [[Jim Crow laws]] and [[Racial segregation in the United States|racial segregation]] in Arlington by the early 20th century. Developers and local politicians further ingrained these practices in Arlington as it experienced a boom in suburbanization with its expanding interurban [[Tram|trolley]] network starting in the 1880s and a continued influx of federal employees into the 1950s. Despite opposition from Virginia's [[massive resistance]] campaign and other groups, Arlington became the first county in Virginia to [[Desegregation in the United States|desegregate]] its schools in 1959, and its businesses in 1960 after a [[Cherrydale sit-ins|series of sit-in protests]].

Arlington's modern economic development has been greatly influenced by its Metrorail lines, which through deliberate planning starting in the 1960s have become the center of its urban corridors. Many [[Federal government of the United States|federal government]] agencies and complexes, including the [[The Pentagon|Pentagon]], which houses the headquarters of the [[United States Department of Defense]], are based in Arlington. Government contractors that serve these organizations and others in the Washington metropolitan area, such as [[Boeing]] and [[RTX Corporation]], are also located in the county. While the public sector is a primary driver of Arlington's economy, tech firms with private sector operations, including Amazon, have established regional headquarters or offices in Arlington's business districts over the past several decades. Institutions of higher education with main or satellite campuses in the county include [[George Mason University]], [[Marymount University]], the [[University of Virginia]], and [[Virginia Tech]]. Arlington is also known as the location of [[Arlington National Cemetery]], a [[War grave|military cemetery]] established in 1864 where more than 400,000 members of the U.S. Armed Forces are buried. Sites at the cemetery such as the Tomb of the Unknown Soldier attract thousands of visitors annually. Other prominent military memorials located in Arlington include the [[Marine Corps War Memorial]] and [[United States Air Force Memorial|Air Force Memorial]].

==History==
===Native American settlement===
{{Further|Native American tribes in Virginia}}
Arlington County was inhabited by prehistoric Native American cultures from the arrival of the [[Paleo-Indians]] 10,000 years before European colonization.<ref>{{harvnb|Rose Jr.|1976|p=9}}</ref> Archeological evidence, including pottery fragments, tools, and arrowheads, suggests sporadic habitation during the [[Archaic period (North America)|Archaic Period]], with more permanent communities during the [[Formative stage]] and [[Woodland period|Early Woodland]] period.<ref>{{harvnb|Rose Jr.|1976|pp=11-13}}</ref> Some objects unearthed during archeological digs have been found to be from as far as southern [[Ontario]], indicating the existence of a trade route that ran through the area.<ref>{{harvnb|Rose Jr.|1976|p=13}}</ref>

[[File:John Smith Arlington Map.jpg|thumb|alt=Detail from John Smith's 1624 map of the Chesapeake region that features the present-day Arlington County area, which is oriented toward the west. The Nameroughquena settlement is positioned near the center along the Potomac River|Detail from John Smith's 1624 map of the [[Chesapeake Bay|Chesapeake]] region that features the present-day Arlington County area, which is oriented toward the west. The Nameroughquena settlement is positioned near the center along the Potomac River]]

When [[John Smith (explorer)|John Smith]] made contact in 1608, Arlington was populated by the [[Nacotchtank]], an [[Eastern Algonquian]]-speaking people that were likely part of the [[Tsenacommacah|Powhatan Confederacy]].<ref name = "Rose Jr. pp. 13-15">{{harvnb|Rose Jr.|1976|pp=13-15}}</ref> He identified a village named Nameroughquena near the present-day [[14th Street bridges]].<ref name = "Rose Jr. pp. 13-15"/> The Nacotchtank farmed, hunted, and fished along the nearby Anacostia River, where they had more villages.<ref>{{harvnb|Williams|2001|p=411}}</ref> 

Later in the 17th century, the Nacotchtank became involved in the regional [[North American fur trade|beaver trade]] instigated by [[Henry Fleete]], which while enabling the Nacotchtank to build wealth, undermined traditional social structures and ultimately weakened them.<ref>{{harvnb|Williams|2001|p=412}}</ref> Further pressures, including population loss due to the [[Native American disease and epidemics|spread of infectious diseases from Europeans]], warfare with encroaching British colonizers, and conflict with Native American tribes in northern regions forced the Nacotchtank to abandon their homeland.<ref>{{cite journal |last1=Feest |first1=Christian |title=Seventeenth Century Virginia Algonquian Population Estimates |journal=Quarterly Bulletin, Archeological Society of Virginia |date=1973 |volume=28 |issue=2 |page=74 |url=https://www.researchgate.net/profile/Christian-Feest/publication/263851645_Seventeenth_Century_Virginia_Algonquian_Population_Estimates/links/02e7e53c1b1ea73bbc000000/Seventeenth-Century-Virginia-Algonquian-Population-Estimates.pdf |access-date=4 June 2025}}</ref><ref name = "Rose Jr. pp. 13-15"/> By 1679, they had fully left the area and were absorbed into the [[Piscataway people|Piscataway]].<ref name = "Rose Jr. pp. 13-15"/>

===Colonial era===
{{Further|Colony of Virginia}}
[[File:Ball-Sellers house 18th century section.jpg|thumb|alt=Original mid-18th century section of the Ball-Sellers House built by John Ball as a log cabin. It is the oldest building in Arlington County|The original mid-18th century section of [[Ball–Sellers House]], built by John Ball as a log cabin, is the oldest building in Arlington County, and currently operates as a [[Historic house museum|house museum]].]]

Colonists began migrating from [[Jamestown, Virginia|Jamestown]] and towards the Potomac River between 1646 and 1676, during which land [[speculation]] in the region increased substantially.<ref name = "Rose Jr. p. 21">{{harvnb|Rose Jr.|1976|p=21}}</ref> Early grants were issued in the mid-17th century by the Governor on behalf of the [[The Crown|Crown]] to prominent figures of Virginia society; many never inhabited their landholdings during this period.<ref name = "Rose Jr. p. 21"/><ref>{{harvnb|Rose Jr.|1976|pp=22-23}}</ref> The first "seated" grant in the area was the Howson Patent, which John Alexander purchased from Captain Robert Howson on November 13, 1669, and populated with tenants by 1677.<ref>{{harvnb|Rose Jr.|1976|pp=24-25}}</ref> With the establishment of the [[Northern Neck Proprietary]] after the [[Stuart Restoration|restoration]] of [[Charles II of England|Charles II]] in 1660, future land grants in the region were made by inheritors of Northern Neck, namely the [[Lord Fairfax of Cameron|Lords Fairfax]].<ref>{{harvnb|Rose Jr.|1976|p=25}}</ref>

After colonists depopulated the area in the aftermath of [[Bacon's Rebellion]] in 1676, migration to Northern Neck began to grow by the end of the 17th century. The increase in population justified the formation of [[Prince William County, Virginia|Prince William County]] from parts of [[Stafford County, Virginia|Stafford County]] in 1730, and in 1742 [[Fairfax County, Virginia|Fairfax County]], of which present-day Arlington County was part.<ref>{{harvnb|Rose Jr.|1976|p=28}}</ref> Early settlement patterns were defined by large [[Plantation complexes in the Southern United States|plantations]] along waterways, where [[Planter class|planters]] built [[wharf|wharfs]] that provided access to colonial trade networks.<ref>{{harvnb|Rose Jr.|1976|p=29}}</ref> This included [[Abingdon (plantation)|Abingdon Plantation]], which was established by John Alexander's grandson Gerard by 1746 and was the Arlington area's first mansion house.<ref>{{cite journal |last1=Dodge |first1=George |title=The Abingdon of Alexander Hunter Et. Al |journal=Arlington Historical Magazine |date=October 1999 |volume=11 |issue=3 |page=43 |url=https://arlhist.org/wp-content/uploads/2019/02/1999-5-Abingdon.pdf |access-date=12 July 2025}}</ref><ref name = "Kaplan et al p. 47">{{harvnb|Kaplan|Good|Kerr|2025|p=47}}</ref> [[Log cabin#United States and Canada|Log cabins]], such as the [[Ball–Sellers House|home]] built by John Ball in the mid-18th century, were common among Arlington's [[yeoman]] farming community.<ref>{{harvnb|Rose Jr.|1976|p=33}}</ref> 

[[Indentured servitude in British America|Indentured servants]] and [[Slavery in the colonial history of the United States|enslaved labor]] worked the land, the latter of which are first documented being in the Arlington area in 1693 and were owned by the wealthiest planters, such as the [[Mason family|Masons]] and [[Washington family|Washingtons]].<ref>{{harvnb|Kaplan|Good|Kerr|2025|p=46}}</ref><ref>{{harvnb|Rose Jr.|1976|p=35}}</ref> [[Tobacco]] was the dominant crop grown in Arlington until local soil was exhausted by the late 18th century, motivating tobacco planters to move further inland; remaining farmers turned to growing alternatives such as corn.<ref name = "Kaplan et al p. 47"/><ref>{{harvnb|Rose Jr.|1976|pp=41-42}}</ref> Colonists also built [[gristmills]] along Arlington's creeks and engaged in [[fishing]] along the Potomac.<ref>{{harvnb|Rose Jr.|1976|pp=43-44}}</ref> Rudimentary roads, some of which were first established by Native Americans, and ferries along the Potomac connected residents and plantations with emerging towns such as [[Alexandria, Virginia|Alexandria]] and [[Georgetown (Washington, D.C.)|Georgetown]].<ref>{{harvnb|Rose Jr.|1976|p=46}}</ref> The former served as the region's primary shipping and commercial district.<ref>{{harvnb|Rose Jr.|1976|p=46}}</ref>

===Revolutionary war and formation of federal district===
The [[Stamp Act 1765|Stamp Act]] and [[Townshend Acts]] passed by the [[Parliament of Great Britain]] in the 1760s motivated planters and farmers in [[Fairfax County, Virginia|Fairfax County]], including [[George Mason]], [[George Washington]], and members of the Ball family to sign agreements not to import or purchase British goods in protest.<ref name = "Rose Jr. p. 50">{{harvnb|Rose Jr.|1976|p=50}}</ref> Mason later authored the [[Fairfax Resolves]] in 1774 in opposition to the policies, which were adopted by him and other landowners.<ref name = "Rose Jr. p. 50"/> 

Following the [[Virginia Conventions#First through fourth Revolutionary conventions|Richmond Convention]] in 1776, Fairfax County established a [[Committee of safety (American Revolution)|Committee of Safety]] that collected taxes for the war effort and enforced bans on trade with Britain.<ref>{{harvnb|Rose Jr.|1976|pp=52-53}}</ref> Local Fairfax militia formed before the war were dissolved after the Richmond Convention ordered for the organization of a regular state force in July 1775.<ref>{{harvnb|Rose Jr.|1976|p=55}}</ref> Men were recruited from Fairfax County and joined the Virginia state regiment that were incorporated into the [[Continental Army]] by 1776.<ref>{{harvnb|Rose Jr.|1976|p=56}}</ref> While the area did not see significant action during the war, Alexandria was the home port for part of the [[Virginia State Navy#American Revolutionary War|Virginia State Navy]]; some ships operated as [[privateer]]s.<ref>{{harvnb|Rose Jr.|1976|pp=57-58}}</ref> Part of [[Jean-Baptiste Donatien de Vimeur, comte de Rochambeau|Rochambeau]]'s [[Expédition Particulière|forces]] likely camped near [[Theodore Roosevelt Island]] on their way to [[Siege of Yorktown|Yorktown]] in 1781.<ref>{{harvnb|Rose Jr.|1976|pp=59-60}}</ref>

[[File:Map of the District of Columbia, 1835.jpg|thumb|An 1835 map of the [[Washington, D.C.|District of Columbia]]]]
After American independence from the [[British Empire]] was achieved following the [[Treaty of Paris (1783)|Treaty of Paris]] and the [[Constitution of the United States|Constitution]] was instituted in 1789, the federal government set about establishing the United States' seat of government, which Article 1, Section 8 enabled through the power to acquire an area of no more than ten square miles for the nation's capital.<ref name = "Rose Jr. p. 63">{{harvnb|Rose Jr.|1976|p=63}}</ref> The [[Residence Act]] passed by Congress on July 17, 1790, which decreed that the federal district be located on the Potomac River between the "mouths of the Eastern Branch and the [[Conococheague Creek|Conogochegue]]", settled the rivalry between states on claiming the location of the capital city.<ref name = "Rose Jr. p. 63"/> President George Washington commissioned a survey to define its borders, which reached down to [[Hunting Creek]] and were consequently beyond the Residence Act's limits; this required an amendment that was passed on March 3, 1791.<ref name = "Rose Jr. p. 63"/> 

[[File:DC SW9 Milestone 2017b.jpg|thumb|alt=The [[Benjamin Banneker: SW-9 Intermediate Boundary Stone]], located at the border of Arlington and Falls Church, was one of many stones placed as a part of the in 1791 survey|The [[Benjamin Banneker: SW-9 Intermediate Boundary Stone]], located at the border of Arlington County and [[Falls Church, Virginia|Falls Church]], one of many stones placed as a part of the 1791 survey]]

In 1789, Virginia had offered to cede ten square miles or less and provide funding for the construction of public buildings. Congress accepted this as a part of the federal district, but specified that no public buildings would be erected in the Virginia section of the capital.<ref name = "Rose Jr. p. 63"/> Boundary stones were placed at one miles intervals along the borders of the district starting on April 15, 1791.<ref name = "Rose Jr. p. 63"/> The federal government and Congress moved to the new city of Washington within the District of Columbia in 1800; the Virginia section, which included Alexandria, became known as Alexandria County through the [[District of Columbia Organic Act of 1801]].<ref>{{harvnb|Rose Jr.|1976|p=64}}</ref>

===Antebellum period===
[[File:View of the City of Washington from the Virginia Shore, by William MacLeod.jpg|thumb|left|alt=William MacLeod, ''View of the City of Washington from the Virginia Shore'' (1856), [[Art in the White House|White House Collection]]. MacLeod's scene depicts the rural state of 19th century Alexandria County in the foreground|William MacLeod, ''View of the City of Washington from the Virginia Shore'' (1856), [[Art in the White House|White House Collection]]. MacLeod's scene depicts the rural state of 19th century Alexandria County in the foreground]]

In the early 19th century, the land outside of Alexandria, termed the "country part" of Alexandria County and representative of present-day Arlington, remained rural and dominated by several large plantations and smaller farms. Migration from northern states, including [[New York (state)|New York]] and [[Pennsylvania]], brought investment and improved farming methods.<ref>{{harvnb|Rose Jr.|1976|pp=91-92}}</ref> Small communities established along the intersections of Alexandria County's growing road network, including [[Ballston, Virginia|Ball's Crossroads]], became gathering places for local residents.<ref>{{cite journal |last1=Smith |first1=Percy C. |title=Ball's Cross Roads |journal=Arlington Historical Magazine |date=October 1960 |volume=1 |issue=4 |page=54 |url=https://arlhist.org/wp-content/uploads/2020/04/1960-8-Balls.pdf |access-date=14 July 2025}}</ref> The county's [[Free Negro|free black]] population, which consistent of 235 individuals outside of Alexandria in 1840, lived throughout the area in small clusters and among white neighbors.<ref>{{harvnb|Bestebreurtje|2024|p=15}}</ref> While agriculture, particularly of corn and [[grain]], was the county's main economic output in the first half of the 19th century, some residents worked in various trades and factories in Alexandria.<ref>{{harvnb|Rose Jr.|1976|pp=86-87}}</ref> Other non-farming occupations included fishing and brickmaking.<ref>{{harvnb|Rose Jr.|1976|pp=87-88}}</ref>

[[File:NPG-S NPG 2010 22Custis-000002.jpg|upright=0.75|thumb|alt=1856 portrait of George Washington Parke Custis|An 1856 portrait of [[George Washington Parke Custis]]]]

[[Slavery in the United States|Enslaved]] [[African Americans]] consisted of around 26% of the population in 1810, working on properties such as [[George Washington Parke Custis]]'s [[Arlington House, The Robert E. Lee Memorial|Arlington Plantation]], which Custis established with his inheritance from [[John Parke Custis]], step-son of George Washington, in 1802; this included 18,000 acres of land across Virginia and 200 slaves, 63 of which worked on building and maintaining the plantation.<ref>{{harvnb|Rose Jr.|1976|p=67}}</ref><ref>{{harvnb|Liebertz|2016|p=2}}</ref> The prominent African American [[Syphax family]], whose [[matriarch]] [[Maria Carter Syphax]] was an illegitimate daughter of Custis and enslaved maid [[Arianna Carter]], originated as enslaved servants on the Arlington estate; Custis later [[Manumission|manumitted]] Maria and her children in 1845 and granted them 17 acres of land.<ref>{{cite web |title=The Syphax Family |url=https://www.nps.gov/arho/learn/historyculture/syphax.htm |website=nps.gov |publisher=National Park Service |access-date=15 July 2025}}</ref><ref>{{cite web |title=George Washington Parke Custis |url=https://www.mountvernon.org/library/digitalhistory/digital-encyclopedia/article/george-washington-parke-custis#4 |website=mountvernon.org |publisher=The George Washington Presidential Library at Mount Vernon |access-date=15 July 2025}}</ref> Custis was the largest slave owner in the area until his death in 1857.<ref name = "Kaplan et al p. 47"/>

The population share of the enslaved dropped to around 20% by 1840 as a consequence of the continued movement away from labor-intensive tobacco farming and the slave trade with [[Deep South|Deep Southern]] states and territories.<ref name = "Kaplan et al p. 47"/> Alexandria became a national center of this trade, with firms like [[Franklin and Armfield Office|Franklin & Armfield]] pioneering in the [[Human trafficking|trafficking]] of enslaved people from around the [[Chesapeake Bay|Chesapeake]] region to [[New Orleans]] and the [[Natchez slave market|Forks in the Road]] [[Slave markets and slave jails in the United States|slave market]] in [[Natchez, Mississippi|Natchez]], where they were sold to the Deep South's growing [[cotton]] plantations.<ref>{{harvnb|Skolnik|2021|p=20}}</ref>

[[File:Potomac Chain Bridge drawing Kollner 1839.jpg|thumb|alt=An 1839 illustration of the Chain Bridge, looking towards the Virginia side|An 1839 illustration of the Chain Bridge, looking towards the Virginia side]]

Major infrastructure, including the [[Chain Bridge (Potomac River)|Chain Bridge]], [[Long Bridge (Potomac River)|Long Bridge]], and [[Aqueduct Bridge (Potomac River)|Aqueduct Bridge]], was built in the first half of the 19th century to better connect the District of Columbia with the surrounding region.<ref>{{harvnb|Rose Jr.|1976|pp=73-74}}</ref> [[Toll road]]s were established between Alexandria, Georgetown, [[Leesburg, Virginia|Leesburg]], and other major settlements to facilitate the improvement and maintenance of thoroughfares, some of which also funded bridge construction.<ref>{{harvnb|Rose Jr.|1976|pp=74-75}}</ref> The [[Alexandria Canal (Virginia)|Alexandria Canal]], which via the 1843 Aqueduct Bridge connected Alexandria to the [[Chesapeake and Ohio Canal]] in Georgetown, was opened in 1846.<ref name = "Rose Jr. p. 79">{{harvnb|Rose Jr.|1976|p=79}}</ref> Alexandria County's first [[Rail transport|railway]], the Alexandria and Harper's Ferry Railroad, was chartered in 1847; it later became part of the [[Washington and Old Dominion Railroad]].<ref>{{harvnb|Rose Jr.|1976|p=77}}</ref> Infrastructure expansion drove the Jackson City speculative development, which was established in 1835 by a group of investors from New York at the foot of Long Bridge. Their vision of Jackson City as a rival port to Georgetown and Alexandria was never realized, as the settlement failed to receive a charter from Congress owing to opposition from residents Georgetown and Washington.<ref>{{harvnb|Rose Jr.|1976|p=92-93}}</ref>

====Retrocession====
{{main|District of Columbia retrocession}}
[[File:Map of Alexandria Canal 1838.jpg|thumb|alt=1838 map of the Alexandria Canal. Alexandria County's public debts from this and other projects amounted to nearly $2 million.<ref>{{harvnb|Richards|2004|p=61}}</ref>|An 1838 map of [[Alexandria Canal (Virginia)|Alexandria Canal]], which, along with other projects, propelled Alexandria County's public debt to nearly $2 million.<ref>{{harvnb|Richards|2004|p=61}}</ref>]]
The reintegration of Alexandria County into Virginia had been raised intermittently since the formation of the District, particularly by townspeople in Alexandria.<ref name = "Rose Jr. p. 79"/> Congressional debate of the issue began with discussion of the 1801 Organic Act and its implications, focusing on the lack of political rights afforded to District residents,<ref>{{harvnb|Richards|2004|p=57}}</ref> who were not permitted to vote or have representation in Congress.<ref>{{harvnb|Clark|2022|p=31}}</ref> Economic concerns relating to insufficient federal investment in infrastructure like the Alexandria Canal, which left Alexandria heavily indebted, motivated merchants and leaders in Alexandria to consider retrocession by the 1830s.<ref>{{harvnb|Richards|2004|p=61}}</ref> The argument went that rejoining Virginia would bring financial relief to the municipal budget, greater support for economic development, restored political rights, and free Alexandria County from "antiquated" statutes Congress had inherited from older colonial laws and not updated.<ref>{{harvnb|Richards|2004|pp=61-62}}</ref>

Congress's failure to recharter banks in the District further frustrated Alexandria's business community,<ref>{{harvnb|Richards|2004|p=66}}</ref> and in 1840 the Common Council of Alexandria convened a county-wide referendum on retrocession, with a majority voting in favor.<ref name = "Richards p. 67">{{harvnb|Richards|2004|p=67}}</ref> After several years of lobbying by a committee of Alexandrians, the Virginia General Assembly introduced state legislation in July 1846 to accept Alexandria County back into Virginia territory if Congress agreed.<ref name = "Richards p. 67"/> Congress passed the Retrocession Act later that month that authorized the return of Alexandria County to Virginia pending another county referendum.<ref name = "Richards p. 71">{{harvnb|Richards|2004|p=71}}</ref>

{{Quote box
 |bgcolor=#F3F0FD
 |quote  = "The act of retrocession is an act in clear and obvious hostility to the spirit and provisions of the constitution of the United States, and beyond the possibility of honest doubt, null and void; That therefore we respectfully invoke the senate and house of assembly to disregard and give no countenance or head to any so-called commissioners or representative pretending or purporting to speak for and in behalf of the citizens of the county of Alexandria, and more especially of the citizens of the country part of the same."
 |author = Committee of Nine
 |source = Memorial to Governor of Virginia. December 2, 1846 <ref name = "Richards p. 72"/>
 |width  = 35%
 |align  = right
}}

The referendum, held on September 1 and 2, passed with overwhelming support from Alexandrians, but was rejected by residents in the broader county;<ref name = "Richards p. 71"/> many in Alexandria County questioned the constitutionality of retrocession and felt marginalized by a movement that was primarily driven by Alexandria's business interests.<ref>{{harvnb|Richards|2004|pp=72-73}}</ref> George Washington Parke Custis, who had originally opposed retrocession due to concerns about the county's finances, changed sides after the Virginia General Assembly agreed to take on the debt incurred by the Alexandria Canal construction.<ref name = "Richards p. 71"/><ref name = "Richards p. 72">{{harvnb|Richards|2004|p=72}}</ref> Alexandria County was officially returned to Virginia on March 13, 1847, after the Virginia General Assembly passed the state's retrocession bill.<ref>{{harvnb|Richards|2004|p=73}}</ref>

Beyond the freeholding whites in Alexandria County who were able to participate in the referendum, Alexandria County's free black community was also opposed to retrocession, as they anticipated the [[Pro-slavery ideology in the United States|pro-slavery]] Virginia government would encroach upon their rights and institutions. This fear was realized soon after retrocession, when Virginia closed most of Alexandria County's black schools and imposed [[Black Codes (United States)#Before the Civil War|Black Codes]] upon all free African Americans.<ref>{{harvnb|Richards|2004|p=72}}</ref><ref>{{harvnb|Bestebreurtje|2024|p=18}}</ref>

[[File:Franklin and Armfield slave prison Alexandria Virginia 1836.png|thumb|left|alt=Franklin & Armfield's Alexandria office and slave prison in 1836|[[Franklin and Armfield Office|Franklin & Armfield]]'s Alexandria office and slave prison in 1836]]

While not mentioned prominently in contemporary debates about retrocession, modern historians and other figures have since argued that the future of slavery in Alexandria and Virginia more broadly was a significant factor.<ref>{{harvnb|Clark|2022|pp=39-40}}</ref> Growing [[Abolitionism in the United States|domestic]] and international [[Abolitionism|abolitionist]] sentiments stoked fears in Alexandria that slavery would eventually be abolished in the District of Columbia and by extension threaten the town's lucrative slave trade.<ref>{{harvnb|Clark|2022|p=38}}</ref> This ultimately came to pass as a part of the [[Compromise of 1850]], which banned Washington's slave trade.<ref>{{harvnb|Richards|2004|p=74}}</ref> 

In 1907, Alexandria County attorney [[Crandal Mackey]] wrote that, given Alexandria County's existence as a destination for runaway enslaved people, Alexandrians thought they would be better served by the enforcement of slaveowners' property rights that would be guaranteed by Virginia's pro-slavery government.<ref name = "Clark p. 39">{{harvnb|Clark|2022|p=39}}</ref> Retrocession also enabled the pro-slavery faction of the Virginia General Assembly to add two safe seats, strengthening their position against non-slave owning, abolitionist-leaning constituencies in Western Virginia.<ref name = "Richards p. 71"/><ref name = "Clark p. 39"/>

===Civil War===
{{Further|Virginia in the American Civil War}}

The "country part" of Alexandria County leaned strongly [[Southern Unionist|Unionist]], as indicated by the results of the May 23, 1861 vote held on the ratification of Virginia's [[Ordinance of Secession]]; despite reports of [[Electoral fraud#Intimidation|voter intimidation]] from secessionists, two-thirds voted against the Ordinance.<ref>{{harvnb|Rose Jr.|1976|pp=97-98}}</ref> This was in part a result of the migration from northern states into Arlington County during the first half of the 19th century, some of whom were sympathetic to abolitionism and the [[Republican Party (United States)|Republican Party]].<ref>{{harvnb|Rose Jr.|1976|p=94}}</ref> Regardless, Virginia voted overwhelmingly in favor of secession and joined the [[Confederate States of America|Confederacy]].<ref>{{harvnb|Rose Jr.|1976|p=98}}</ref> [[Robert E. Lee]], a colonel in the U.S. Army, son-in-law of George Washington Parke Custis, and owner of Arlington Plantation following Custis's death, left for Richmond with his family on April 22, 1861, to accept command of Virginia's army.<ref>{{harvnb|Rose Jr.|1976|p=99}}</ref>

====Union occupation====
[[File:Fort Richardson 32726v.jpg|thumb|alt=1861 image of [[1st Connecticut Heavy Artillery Regiment|1st Connecticut Heavy Artillery]] at [[Fort Richardson (Arlington, Virginia)|Fort Richardson]]|The [[1st Connecticut Heavy Artillery Regiment|1st Connecticut Heavy Artillery]] at [[Fort Richardson (Arlington, Virginia)|Fort Richardson]] in 1861, during the [[American Civil War]]]]
The proximity of Alexandria County to Washington, as well as the direct lines of sight it offered to important landmarks, necessitated the construction of defenses to protect the capital.<ref name = "Rose Jr. 1960 p. 14>{{harvnb|Rose Jr.|1960|p=14}}</ref> After engaging in brief reconnaissance activities, the [[Union army]] moved three units into Alexandria County on the night of May 23, 1861, with commanding officer General [[Joseph K. Mansfield]] establishing a regional headquarters at Arlington Plantation.<ref name = "Rose Jr. 1960 p. 14/> Work began immediately on a series of fortifications that eventually became the [[Arlington Line]] of the [[Civil War Defenses of Washington]]. These included forts and rifle trenches along Arlington Heights, thoroughfare intersections, and bridgeheads.<ref name = "Rose Jr. 1960 p. 14/><ref>{{harvnb|Rose Jr.|1960|pp=15-17}}</ref> The Confederate victory at the [[First Battle of Bull Run|Battle of Bull Run]] in July 1861 increased the urgency of completing Washington's defenses,<ref>{{harvnb|Rose Jr.|1960|p=15}}</ref> which were mostly finished by the end of that year.<ref>{{harvnb|Rose Jr.|1960|p=18}}</ref> The Union army also built roads, including [[Military Road (Arlington, Virginia)|Military Road]], to enable improved communications and transport along the defensive line.<ref name = "Rose Jr. p. 104">{{harvnb|Rose Jr.|1976|p=104}}</ref> Construction of forts and improvements continued up to 1863.<ref name = "Rose Jr. p. 104"/>

[[File:Arlington, Virginia (vicinity). Gen. Samuel P. Heintzelman and staff at Arlington house. (Mathew B. Brady, the photographer is shown in a top hat) LOC cwpb.01482.jpg|thumb|alt=General [[Samuel P. Heintzelman]] and staff at Arlington House (1861), [[Mathew Brady]]|General [[Samuel P. Heintzelman]] and his staff at Arlington House in 1861, during the Civil War, photographed by [[Mathew Brady]]]]

The Union occupation significantly altered the landscape of Alexandria County. Defensive works required the logging of forests and trenches that cut through farmland.<ref name = "Rose Jr. p. 105">{{harvnb|Rose Jr.|1976|p=105}}</ref> Union troops repurposed private homes and public buildings as hospitals and other facilities.<ref>{{harvnb|Rose Jr.|1976|pp=105-106}}</ref> Many properties were left decimated following troop encampments and the razing of structures for timber and other resources.<ref name = "Ward">{{cite journal |last1=Ward |first1=Ruth |title=Life in Alexandria County During the Civil War |journal=Arlington Historical Magazine |date=October 1984 |volume=7 |issue=4 |pages=3-4 |url=https://arlhist.org/wp-content/uploads/2020/02/1984-2-Life.pdf |access-date=16 July 2025}}</ref> Confederate sympathizers, many of whom were local officials, left after the arrival of Union soldiers, which created gaps in governance; General [[William Reading Montgomery]] addressed this by creating a military court that tried military and civilian cases, which was eventually closed after local criticism.<ref>{{harvnb|Rose Jr.|1976|pp=106-107}}</ref>

====Military engagements====
[[File:Confederate Works on Munson's Hill.jpg|thumb|alt=Confederate position on Munson's Hill from [[Bailey's Crossroads, Virginia|Bailey's Crossroads]], September 1861|A [[Confederate States Army]] position on Munson's Hill from [[Bailey's Crossroads, Virginia|Bailey's Crossroads]] in September 1861]]
Throughout the war, Alexandria County only saw minor skirmishes between Union and Confederate forces. Confederate parties began engaging in guerrilla tactics against Union outposts in early June 1861,<ref>{{cite journal |last1=Price |first1=William H. |title=Civil War Military Operations in Northern Virginia in May-June 1861 |journal=Arlington Historical Magazine |date=October 1961 |volume=2 |issue=1 |pages=44-45 |url=https://arlhist.org/wp-content/uploads/2016/02/1961-4-Civil.pdf |access-date=16 July 2025}}</ref> including a minor clash at Arlington Mill on June 2.<ref>{{cite web |title=Skirmish at Arlington Mill |url=https://arlhist.org/skirmish-at-arlington-mill/ |website=arlhist.org |publisher=Arlington Historical Society |access-date=16 July 2025}}</ref> The most significant battle took place in August 1861 at Ball's Crossroads, when Confederates stationed at [[Munson's Hill]] in Fairfax County penetrated the Union line as far as [[High View Park|Hall's Hill]], which they shelled before being driven back by Union cavalry.<ref>{{harvnb|Rose Jr.|1976|p=108}}</ref><ref>{{cite news |last1=Miles |first1=Vernon |title=Civil War Camp to Mark Anniversary of Skirmish Near Ballston Tomorrow |url=https://www.arlnow.com/2019/08/23/civil-war-camp-to-mark-anniversary-of-skirmish-near-ballston-tomorrow/ |access-date=16 July 2025 |work=ArlNow |date=August 23, 2019}}</ref> Union forces also operated the [[Union Army Balloon Corps|Balloon Corps]] in Alexandria County until 1863 to perform [[aerial reconnaissance]] on nearby Confederate encampments and activities.<ref>{{cite journal |last1=Robinson |first1=June |title=The United States Balloon Corps in Action in Northern Virginia During the Civil War |journal=Arlington Historical Magazine |date=October 1986 |volume=8 |issue=2 |page=15 |url=https://arlhist.org/wp-content/uploads/2020/02/1986-2-Balloon.pdf |access-date=16 July 2025}}</ref>

====Arlington Cemetery and Freedman's Village====
[[File:Marked graves in a section of Arlington National Cemetery referred to as the "Field of the Dead".jpg|thumb|left|alt=Gravestones in Arlington National Cemetery, c. 1865|Gravestones at [[Arlington National Cemetery]], {{Circa|1865}}]]
Congress's June 1862 enactment of an assessment of taxes owed by Southern property owners, and subsequent enforcement of tax collection, resulted in the Lee family owing $92.07 on Arlington plantation.<ref name = "Rose Jr. p. 109">{{harvnb|Rose Jr.|1976|p=109}}</ref> [[Mary Anna Custis Lee]] sent a relative to pay this, which was rejected given her absence.<ref name = "Rose Jr. p. 109"/> The federal government then seized Arlington estate and purchased it at a public auction held on January 11, 1864, on orders from President [[Abraham Lincoln]].<ref>{{harvnb|Hanna|2001|p=81}}</ref> Following this purchase, the [[Quartermaster General of the United States Army|Quartermaster General's Office]], in search of a burial site for the many Union casualties at the [[Battle of the Wilderness]], selected Arlington in May 1864 for its scenic beauty and association with Robert E. Lee.<ref>{{harvnb|Hanna|2001|pp=84-85}}</ref> The [[William Henry Christman|first military burial]] took place on Mary 13, 1864, around one month before the cemetery was officially established.<ref>{{harvnb|Hanna|2001|p=86}}</ref>

[[File:Freedman's Village, Arlington, Va. 34829v.jpg|thumb|alt=Photograph of children reading books at Freedman's Village, ca. 1864-1865|Children reading books at Freedman's Village, {{Circa|1864-1865}}]]

The rise in [[Contraband (American Civil War)|contraband]] migrants from the South into Washington, and the overcrowded camps that accommodate them, motivated the [[Department of Washington]] to establish the [[Freedman's Village]] settlement for emancipated enslaved people on the grounds of Arlington.<ref>{{harvnb|Bestebreurtje|2024|p=18}}</ref><ref name = "Bestebreurtje p. 19">{{harvnb|Bestebreurtje|2024|p=19}}</ref> Founded on December 4, 1863, Freedman's Village, unlike other contraband camps, was envisioned as a model community for African Americans transitioning out of enslavement.<ref name = "Bestebreurtje p. 19"/> The Village provided its inhabitants with instruction in trades, housekeeping, and general education; many were employed by the Union Army and paid a regular wage.<ref>{{harvnb|Bestebreurtje|2024|p=21}}</ref> [[United States Secretary of State|Secretary of State]] [[William H. Seward]] often toured prominent visitors around Freedman's Village to demonstrate the Villagers' progress.<ref>{{harvnb|Schildt|1995|p=10}}</ref> Many organizations, including churches and fraternities, were founded by Villagers during this period that became the social foundation of Arlington's black community.<ref>{{harvnb|Bestebreurtje|2024|pp=14-15}}</ref>

===Reconstruction through 1900===
Years of occupation by Union troops left Alexandria County's economy in poor condition after the war; thousands of acres of farms and woodland had been destroyed.<ref>{{harvnb|Rose Jr.|1976|pp=119-120}}</ref> Local landowners who applied for compensation through the [[Southern Claims Commission]] generally received much less than they requested.<ref name = "Ward"/> Some financially ruined residents sold off parcels of land at low rates to formerly enslaved people migrating into Alexandria County from rural Virginia and Maryland, eventually creating black enclaves like Hall's Hill.<ref>{{harvnb|Bestebreurtje|2024|pp=27-29}}</ref>

[[File:1878 Alexandria County Virginia.jpg|thumb|alt=1878 map of Alexandria County illustrating its three districts and separation from Alexandria|An 1878 map of Alexandria County illustrating its three districts and separation from Alexandria]]

Changes in municipal governance in Virginia's [[Constitution of Virginia#1870|1870 Constitution]] required that all counties be divided into three or more districts, excluding any cities with a population greater than 5,000. This administratively separated Alexandria from the rest of the county and divided Alexandria County into the Arlington, Jefferson, and Washington Districts, with each having its own elected offices, public schools, and other facilities.<ref>{{harvnb|Rose Jr.|1976|p=125-126}}</ref><ref>{{harvnb|Rose Jr.|1976|p=132-133}}</ref> The [[Reconstruction Amendments]] passed along with the 1870 Constitution enabled Alexandria County's eligible black voters to participate in district and county-level elections, resulting in local black politicians, such as [[John B. Syphax]], rising to elected office.<ref name = "Bestebreurtje p. 35">{{harvnb|Bestebreurtje|2024|p=35}}</ref> This was especially the case in the Jefferson District, which contained Freedman's Village and became a center of black political power in the county.<ref name = "Bestebreurtje p. 35"/>

[[File:John B. Syphax.png|upright=0.75|thumb|alt=An undated photo of John B. Syphax, a leader in Alexandria County's black community who served in several elected offices, including the [[Virginia House of Delegates]] from 1874 to 1875|An undated photo of John B. Syphax, a leader in Alexandria County's black community who served in several elected offices, including the [[Virginia House of Delegates]] from 1874 to 1875]]

While this constituency was initially associated with the [[Republican Party (United States)|Republican Party]], the rise of Virginia's [[Conservative Party (Virginia, 1867)|Conservative Party]], which opposed black suffrage and other Reconstruction-era reforms,<ref>{{harvnb|Rose Jr.|1976|p=117}}</ref> eventually led to the Republicans abandoning their commitments to racial equality.<ref name = "Bestebreurtje p. 66">{{harvnb|Bestebreurtje|2024|p=66}}</ref> Dissatisfied black voters, as well as white working class communities associated with the [[labor movement]], flocked to the [[Readjuster Party]], a newly established [[Progressivism in the United States|progressive]] [[Populism in the United States|populist]] party that opposed Virginia's old planter establishment and controlled the General Assembly by 1879.<ref name = "Bestebreurtje p. 66"/><ref>{{harvnb|Rose Jr.|1976|p=131}}</ref>

White conservatives that wanted to reinstate their [[White supremacy|political and social dominance]] challenged the ascendency of Alexandria County's black community by the 1880s. Through an orchestrated [[smear campaign]] in the local press, they contributed to the closure of Freedman's Village in 1887, which had by that point lost the support of the federal government.<ref name = "Bestebreurtje p. 36">{{harvnb|Bestebreurtje|2024|p=36}}</ref><ref>{{harvnb|Bestebreurtje|2024|p=38}}</ref> White conservatives also prevented elected black officials from taking office either through claims about "inexperience" or identifying failed payments of election dues.<ref name = "Bestebreurtje p. 36"/> This occurred during a broader political shift in Virginia towards [[Southern Democrats]], who successfully undermined the Readjuster Party's interracial coalition with a [[reactionary]], racist platform by 1885.<ref>{{harvnb|Bestebreurtje|2024|p=67}}</ref>

Starting in the 1880s, local railroad companies began constructing an [[Northern Virginia trolleys#Fairfax and Arlington lines|interurban trolley system]] in Alexandria County that eventually provided commuter services to Washington by 1907.<ref name = "Bestebreurtje pp. 55-56">{{harvnb|Bestebreurtje|2024|pp=55-56}}</ref> This facilitated the establishment of suburban subdivisions, such as [[Clarendon, Virginia|Clarendon]], along the trolley lines by 1900.<ref name = "Bestebreurtje pp. 55-56"/> Population growth, as well as the inconvenience of running the county's affairs from the old courthouse in Alexandria, drove the General Assembly to enact legislation that enabled residents to vote if the courthouse should be relocated.<ref name="Rose pp. 32-33">{{cite journal |last1=Rose |first1=Jeanne |title=A History of the Arlington County Courthouse |journal=Arlington Historical Magazine |date=October 1979 |volume=6 |issue=3 |pages=32-33 |url=https://arlhist.org/wp-content/uploads/2017/02/1979-6-History.pdf |access-date=18 July 2025}}</ref> After a majority voted in favor of the motion, the county's new courthouse was completed on the old site of [[Fort Woodbury]] in 1898.<ref name="Rose pp. 32-33"/>

===20th century suburbanization and Jim Crow segregation===
[[File:Clarendon area, Arlington, Va., ca. 1921-1924.tif|thumb|alt=Aerial view of Clarendon ca. 1921–1924. The convergence of two trolley lines is visible near the center of the image|An aerial view of [[Clarendon, Virginia|Clarendon]], {{Circa|1921–1924}}, including the convergence of two trolley lines near the center of the image]]
In the first several decades of the 20th century, Alexandria County, officially renamed to Arlington County after the Arlington estate in 1920,<ref>{{cite web |title=History of Arlington |url=https://www.arlingtonva.us/Government/Topics/Arlington-Welcome-Kit/History-of-Arlington |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=18 July 2025}}</ref> rapidly developed into a commuter suburb of Washington. The ten-year period between 1900 and 1910 saw the creation of 70 new communities and subdivisions.<ref>{{harvnb|Bestebreurtje|2024|p=73}}</ref> Community organizations were established in these neighborhoods to advocate for their residents.<ref>{{harvnb|Rose Jr.|1976|pp=168-169}}</ref> During this period, the City of Alexandria succeeded in annexing significant portions of Arlington's southern area in 1915 and 1929; further annexations were prevented by the General Assembly in 1930.<ref>{{harvnb|Rose Jr.|1976|pp=170-172}}</ref>

[[File:Frank Lyon (1930).jpg|upright=0.75|thumb|alt=1930 portrait of [[Frank Lyon]]|An 1930 portrait of [[Frank Lyon]], who developed several suburbs in northern Arlington, including the eponymous neighborhoods of [[Lyon Village, Virginia|Lyon Village]] and [[Lyon Park Historic District|Lyon Park]]]]
Developers and political figures such as [[Frank Lyon]] and Crandal Mackey, who were members of the [[Progressive Era#South|Southern Progressive]] movement, advocated for county-wide infrastructure improvements and the removal of "areas of vice" to facilitate continued suburbanization.<ref name = "Bestebreurtje p. 67">{{harvnb|Bestebreurtje|2024|p=67}}</ref> This included [[Rosslyn, Virginia|Rosslyn]], an interracial neighborhood which had developed a series of gambling halls and saloons beginning in the 1870s.<ref name = "Bestebreurtje pp. 70-73">{{harvnb|Bestebreurtje|2024|pp=70-73}}</ref> Lyon and Mackey established the Good Citizen's League in the 1890s, which consisted of Arlington's wealthiest and most influential residents, to push for these changes.<ref name = "Bestebreurtje p. 67"/>
Consistent with other Southern Progressives during the [[Jim Crow laws|Jim Crow era]], the Good Citizen's League sought to modernize Arlington while maintaining its racial hierarchy through [[Racial segregation in the United States|segregation]] and other means.<ref name = "Bestebreurtje p. 67"/> League members conducted violent "clean up" raids, most infamously in Rosslyn in 1904,<ref name = "Bestebreurtje pp. 70-73"/> participated in the [[Virginia Constitutional Convention of 1901–02]] that [[Disfranchisement after the Reconstruction era|disenfranchised black voters]] through [[Poll taxes in the United States|poll taxes]],<ref>{{harvnb|Bestebreurtje|2024|p=70}}</ref> and developed white suburban subdivisions via [[Covenant (law)#Exclusionary covenants|racially restrictive housing covenants]].<ref>{{harvnb|Bestebreurtje|2024|p=79}}</ref> By 1930, these figures also succeeded in changing Arlington's system of government, where the districts established in 1870 were abolished and replaced with a county board of five [[at-large]] members that appointed a county manager as chief executive. As intended, this diluted the voting power of Arlington's black population and enabled further institution of racial segregation.<ref>{{harvnb|Bestebreurtje|2024|pp=107-108}}</ref>

While there were no [[Lynching in the United States|lynchings]] in Arlington like elsewhere in the South during the [[Post-Reconstruction American race relations|nadir in American race relations]], there were recorded instances of racial violence by whites against Arlington's black residents, particularly on its segregated trolley lines. One notable example took place in 1908, when two black passengers traveling to Falls Church, Sandy James and Lee Gaskins, were severely beaten and thrown from a trolley car by a crowd of white people; a mob of 300 white people then gathered in Ballston to search for them on account of an unsubstantiated rumor that James and Gaskins had attempted to derail the trolley. Gaskins was found and sentenced to 10 years in prison despite flimsy evidence, and James was never seen again; Arlington Sheriff Howard Fields later boasted that he had hit James in the head 25 times with a [[Baton (law_enforcement)#Blackjacks and saps|blackjack]].<ref>{{harvnb|Bestebreurtje|2024|p=109}}</ref> Arlington also had an active [[Ku Klux Klan|Ku Klux Klan (KKK)]] presence during this period, who would participate in community parades and stage cross burnings near black neighborhoods.<ref>{{harvnb|Bestebreurtje|2024|p=110}}</ref>

[[File:Ku Klux Klan Virginia 1922 Parade.jpg|thumb|alt=KKK members in a funeral parade in Arlington, 1922|[[Ku Klux Klan|KKK]] members in a funeral parade in Arlington in 1922]]
The 1896 ''[[Plessy v. Ferguson]]'' [[Supreme Court of the United States|U.S. Supreme Court]] decision that legalized "[[separate but equal]]" racial segregation enabled the [[Virginia General Assembly|Virginia Assembly]] to pass zoning ordinances in 1912 that created "segregation districts" throughout the state, which were adopted in Arlington.<ref name = "Bestebreurtje pp. 95-96">{{harvnb|Bestebreurtje|2024|pp=95–96}}</ref> While these were eventually struck down by the 1917 ''[[Buchanan v. Warley]]'' decision, county planners and developers restricted the growth of black neighborhoods in other ways, including through Arlington's 1930 zoning ordinance that prevented further construction of more affordable [[Multifamily residential|multifamily housing]] in black communities.<ref>{{harvnb|Bestebreurtje|2024|pp=99–100}}</ref> The effect of these policies was the stagnation of Arlington's black population, which declined from 38% of Arlington's population in 1900 to around 12% by 1930.<ref>{{harvnb|Bestebreurtje|2024|p=84}}</ref> Blacks were forced to concentrate in a few overcrowded enclaves as the county's white population increased rapidly with the growth of whites-only suburban subdivisions. These subdivisions gradually encroached upon black neighborhoods, and by 1950 only three black communities remained in the county; 11 had existed in 1900.<ref>{{harvnb|Bestebreurtje|2024|p=142}}</ref>

===New Deal through Civil Rights===
Beginning in the [[New Deal]] era, Arlington County experienced an inflow of federal workers.<ref>{{harvnb|Rose Jr.|1976|pp=198}}</ref> While the [[Great Depression]] stalled residential development, incoming government employees instigated further growth and the population doubled between 1930 and 1940.<ref>{{harvnb|Rose Jr.|1976|p=180}}</ref><ref>{{harvnb|Rose Jr.|1976|p=198}}</ref> [[Public housing]] projects such as [[Colonial Village (Arlington, Virginia)|Colonial Village]] backed by the [[Federal Housing Administration]] were built across Arlington to help house its expanding population; consistent with Arlington's Jim Crow policies, these communities were closed off to Arlington's black residents and other minority groups.<ref>{{harvnb|Bestebreurtje|2024|pp=127-129}}</ref> New Deal programs, such as the [[Public Works Administration]], also supported the continued improvement of Arlington's infrastructure, including the completion of an overhauled sewer system in 1937 and renovations to local public schools.<ref>{{harvnb|Rose Jr.|1976|pp=180-181}}</ref><ref>{{harvnb|Rose Jr.|1976|p=185}}</ref> Rising car ownership caused the closure of Arlington's trolley lines during the 1930s; these were replaced with a public bus system.<ref>{{harvnb|Rose Jr.|1976|pp=193}}</ref> [[Ronald Reagan Washington National Airport|Washington National Airport]], later renamed after President [[Ronald Reagan]] in 1998, opened in 1941 on land formerly occupied by the Abingdon Plantation.<ref>{{harvnb|Rose Jr.|1976|pp=192-193}}</ref>

Arlington's population increase fundamentally altered its politics. Its traditional Southern Democratic political establishment, which favored racial segregation and consisted of Southerners in the mold of Mackey and Lyon, was gradually replaced with more [[Modern liberalism in the United States|liberal]], [[New Deal coalition|New Deal Democrats]] and white [[Political moderate|moderates]].<ref>{{harvnb|Bestebreurtje|2024|pp=148–149}}</ref> These figures fought for greater investment in public education and infrastructure in Arlington, often against opposition in [[Richmond, Virginia|Richmond]], where the Democratic Party's socially and [[Fiscal conservatism|fiscally conservative]] [[Byrd Machine]] had dominated the General Assembly since the early 20th century.<ref>{{harvnb|Bestebreurtje|2024|pp=148-152}}</ref> These developments coincided with a rising civil rights movement in Arlington, reflected in the establishment of its [[NAACP]] branch in 1940 and Green Valley resident [[Women's poll tax repeal movement#Cases brought by women|Jessie Butler's legal challenge]] to Virginia's poll tax in 1949.<ref>{{harvnb|Bestebreurtje|2024|p=156}}</ref>

[[File:Pentagon construction.jpg|thumb|alt=1942 image of the Pentagon under construction|A 1942 image of [[the Pentagon]] during its construction]]
The entry of the U.S. into [[World War II]] drove expansion in government that had a significant impact on Arlington County. Massive facilities such as the [[The Pentagon|Pentagon]] and [[Navy Annex]] were built to support military operations.<ref>{{harvnb|Perry|2017|p=10}}</ref> These, along with infrastructure like the [[Henry G. Shirley Memorial Highway|Shiley Memorial Highway]], required the demolition of Queen City and East Arlington, two historic black communities that had been established shortly after the closure of Freedman's Village.<ref>{{harvnb|Perry|2017|pp=10-12}}</ref><ref>{{harvnb|Perry|2017|p=7}}</ref> The federal government at first housed displaced residents in several trailer camps after an intervention by First Lady [[Eleanor Roosevelt]];<ref>{{harvnb|Perry|2017|pp=12–14}}</ref> poor living conditions resulted in both being closed by 1949.<ref>{{harvnb|Liebertz|2016|p=53}}</ref> Roosevelt further pressured the [[United States Housing Authority|Federal Public Housing Authority]] in 1944 to provide more housing to Arlington's African American community, resulting in the construction of a 44-unit public housing project in [[Arlington View, Arlington, Virginia|Johnson's Hill]] for black residents that year; many leaving the trailer camps moved into this property.<ref name = "Liebertz p. 54">{{harvnb|Liebertz|2016|p=54}}</ref> By comparison, white residents had access to thousands of public housing units during this period, and none were housed in trailer camps.<ref name = "Liebertz p. 54"/>

[[File:Detail of Arlington Trailer Camp.png|thumb|alt=Arlington Trailer Camp in April 1942|Arlington Trailer Camp in April 1942]]

Arlington's NAACP and other civil rights organizations continued fighting the county's prevailing racial segregation through a series of legal challenges, particularly after the 1954 ''[[Brown v. Board of Education]]'' U.S. Supreme Court ruling that struck down "separate but equal" segregation under ''Plessy v. Ferguson''. Reactionary political forces and organizations, including Virginia's [[massive resistance]] program against racial integration in schooling led by former governor and Senator [[Harry F. Byrd]] and local Arlington hate groups such as [[George Lincoln Rockwell|George Lincoln Rockwell's]] [[American Nazi Party]] and the KKK, rose in opposition to this civil rights activism and Arlington's increasing liberalism.<ref>{{harvnb|Bestebreurtje|2024|pp=162–164}}</ref>

A 1956 lawsuit by NAACP and three residents from Hall's Hill against Arlington's segregation in schooling initiated an extended legal fight that lasted until February 2, 1959, when [[Stratford Junior High School]] in [[Cherrydale, Virginia|Cherrydale]] was racially integrated with the admission of four black students.<ref>{{harvnb|Bestebreurtje|2024|pp=165–168}}</ref> The integration, while tense, occurred with relative peace and was dubbed "the day nothing happened" in the local press.<ref>{{harvnb|Bestebreurtje|2024|p=168}}</ref> In 1960, the [[Cherrydale sit-ins]] organized by the [[Nonviolent Action Group]] at [[Howard University]] resulted in the [[Desegregation in the United States|desegregation]] of Arlington businesses,<ref>{{cite journal |last1=Embree |first1=Gregory J. |title=The Cherrydale Drug Fair Sit-In, 9–10 June 1960: An Arlington Neighborhood’s Brush with History |journal=The Virginia Magazine of History and Biography |date=2022 |volume=130 |issue=2 |page=143 |url=https://www.jstor.org/stable/48664262 |access-date=18 July 2025}}</ref> and with the passing of the [[Civil Rights Act of 1968]], ''[[de jure]]'' racial housing discrimination in Arlington was officially outlawed.<ref>{{harvnb|Bestebreurtje|2024|p=184}}</ref>

===Arrival of Metro===
{{Further|Washington Metro}}
Arlington County experienced decelerated population growth starting in 1960 as a result of continued migration of residents out to newer suburbs in [[Fairfax County, Virginia|Fairfax]] and [[Montgomery County, Maryland|Montgomery]] countits; between 1970 and 1980, Arlington lost 21,865 residents.<ref name = "Craft">{{cite news |last1=Craft |first1=Kevin |title=When the Metro Came to Town |url=https://www.arlingtonmagazine.com/when-metro-came-to-town/ |access-date=18 July 2025 |work=Arlington Magazine |date=October 28, 2013}}</ref> Factors involved in this population shift included new transportation infrastructure that made commuting from more distant communities possible, and [[white flight]] following the [[racial integration]] of Arlington's school system.<ref name = "Bestebreurtje p. 186">{{harvnb|Bestebreurtje|2024|p=186}}</ref> This change caused its commercial districts, which were also facing competitive pressure from suburban [[Shopping mall|malls]], to enter a period of decline.<ref>{{harvnb|Deines|1995|p=58}}</ref>

To revitalize these struggling neighborhoods, the Arlington County government sought to leverage the planned [[Washington Metro]] system, which was originally meant to follow the future [[Interstate 66]] [[Controlled-access highway|freeway]].<ref name = "Craft"/> Government planners were otherwise intending to use the provisions under the [[Federal-Aid Highway Act of 1956|1956 Federal-Aid Highway Act]] to build a freeway network in Arlington to address growing issues with traffic, which while potentially enabling easier commutes into Washington from outer suburbs, presented concerns about destructive highway construction to Arlington's residents.<ref name = "Craft"/> The County Board also desired to diversify Arlington's economy away from the federal government by attracting more commercial activity.<ref name = "Deines p. 61>{{harvnb|Deines|1995|p=61}}</ref> This was reflected in the transformation of Rosslyn, where 19 skyscrapers were completed by 1967.<ref name = "Deines p. 61/>

[[File:Rosslyn 1964.png|thumb|alt=Skyline of Rosslyn in 1964 from Georgetown|The skyline of [[Rosslyn, Virginia|Rosslyn]] from [[Georgetown (Washington, D.C.)|Georgetown]] in 1964]]
After extended negotiations, the County Board convinced the [[Washington Metropolitan Area Transit Authority]] to run the [[Orange Line (Washington Metro)|Orange Line]] between Rosslyn and Ballston. Residents in this area pushed back based on anticipate high-rise development surrounding the Metro stations.<ref name = "Craft"/> This drove the County Board to adopt its "Bull's Eye" planning model, where higher density development would be concentrated within a walkable distance from the planned Metro stations while maintaining pre-existing [[single-family zoning]] beyond a half-mile radius.<ref name = "Craft"/> Both the Orange and [[Blue Line (Washington Metro)|Blue]] Lines were operational by 1979.<ref name = "Craft"/>

[[File:Arlington - Rosslyn from Key Bridge (1970).jpg|thumb|alt=Skyline of Rosslyn in 1970, illustrating increasing densification|The Rosslyn skyline in 1970, illustrating increasing densification]]

As a consequence of reduced rents caused by Orange Line construction, Clarendon became a [[Vietnamese people|Vietnamese]] enclave as refugees migrated to Arlington from [[Southeast Asia]] in the aftermath of the [[Vietnam War]].<ref>{{harvnb|O'Connell|2016|p=10}}</ref> Known by names like [[Little Saigon, Arlington, Virginia|"Little Saigon"]], Clarendon was one of the largest Southeast Asian commercial centers on the [[East Coast of the United States|East Coast]] into the 1980s.<ref>{{cite news |last1=Boodman |first1=Sarah |title=Refugees Crowd Arlington's 'Mekong Delta' |url=https://www.washingtonpost.com/archive/politics/1979/09/23/refugees-crowd-arlingtons-mekong-delta/cc887b09-6374-4e1b-afd7-72e7b703722f/ |access-date=7 May 2025 |work=The Washington Post |date=September 23, 1979}}"</ref><ref>{{harvnb|O'Connell|2016|pp=12-14}}</ref> Increased rents and redevelopment following the opening of the Metro in 1979 eventually [[Community displacement|displaced]] almost all of Clarendon's Vietnamese businesses by the 1990s;<ref>{{harvnb|O'Connell|2016|pp=20-21}}</ref> many moved to the [[Eden Center]] in [[Falls Church, Virginia|Falls Church]], which has succeeded Little Saigon as a Vietnamese community hub.<ref>{{harvnb|O'Connell|2016|p=22}}</ref>

The opening of the Metro stimulated another period of rapid growth. As planned, the corridor between Rosslyn and Ballston experienced revitalization driven by [[Mixed-use development|mixed-used]], [[Transit-oriented development|transit-oriented]] development.<ref name = "Craft"/> Other areas near Blue line stations, such as [[Pentagon City]], also became urbanized with numerous office complexes and retail centers like the [[Fashion Centre at Pentagon City|Pentagon City Mall]] that opened in 1989.<ref name = "Craft"/> As a result, Arlington increasingly transitioned away from being solely a commuter suburb of Washington and towards becoming an [[edge city]] with business and commercial districts.<ref>{{harvnb|Bestebreurtje|2024|pp=187-188}}</ref>

===2000 through present===
[[File:9-11 Pentagon Exterior 09.jpg|thumb|Smoke rising from [[the Pentagon]] following the [[September 11 attacks]]]]
On September 11, 2001, [[The Pentagon]] was targeted as a part of the [[September 11 attacks]], when [[American Airlines Flight 77]] was hijacked and crashed into the building by five [[Al-Qaeda]] [[Islamic terrorism|terrorists]]. The attack killed all 64 passengers and 125 people in the Pentagon, and is memorialized by the [[Pentagon Memorial|National 9/11 Pentagon Memorial]] located on the grounds of the complex.<ref>{{cite web |title=The National 9/11 Pentagon Memorial |url=https://www.defense.gov/Multimedia/Experience/Pentagon-Memorial/ |website=defense.gov |publisher=U.S. Department of Defense |access-date=4 August 2025}}</ref>

In recent years, Arlington's highly educated workforce, proximity to Washington, and financial incentives offered by the government have encouraged [[multinational corporations]], including [[Amazon (company)|Amazon]] and [[Boeing]], to establish [[corporate headquarters]] in Arlington's business districts.<ref>{{cite news |last1=Schulte |first1=Katherine |title=Virginia is for HQs |url=https://virginiabusiness.com/virginia-is-for-hqs/ |access-date=20 July 2025 |work=Virginia Business |date=October 31, 2024}}</ref> New residents, including immigrants of [[Asian American|Asian]] and [[Hispanic and Latino Americans|Hispanic]] background, that have arrived since the passing of the [[Immigration and Nationality Act of 1965|1965 Immigration Act]] have substantially increased Arlington's racial and ethnic diversity, altering the county's historical white-black demographic profile.<ref name = "Bestebreurtje p. 186"/> Some communities, such as Arlington's historically [[African-American neighborhood|black neighborhoods]], have experienced [[gentrification]] into the 21st century, driving rising costs of living.<ref>{{harvnb|Bestebreurtje|2024|pp=191-194}}</ref>

In 2020, Arlington County pursued a [[Missing middle housing|missing middle]] housing study to evaluate solutions to ongoing issues with county's inadequate housing supply, lack of housing options, and increasing housing costs.<ref>{{cite web |title=Missing Middle Housing Study: Process, Scope, & Timeline |url=https://www.arlingtonva.us/Government/Programs/Housing/Housing-Arlington/Tools/Missing-Middle/Scope |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=20 July 2025}}</ref> Following the completion of this study and community engagement, the County Board officially adopted the Expanded Housing Options (EHO) zoning ordinance on March 22, 2023 to allow construction of up to 6 units on lots zoned for single-family housing, with the goal of increasing Arlington's housing supply and relieving upward pressure on the cost of housing.<ref>{{cite web |title=County Board Adopts Expanded Housing Options |url=https://www.arlingtonva.us/About-Arlington/Newsroom/Articles/2023/County-Board-Adopts-Expanded-Housing-Options |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=20 July 2025}}</ref> As of 2025, a successful lawsuit filed by neighborhood organizations opposed to the EHO policy has blocked the measure, which is currently moving through [[appeal]].<ref>{{cite news |last1=Egitto |first1=Dan |title=Appeals court flip-flops on Missing Middle, striking down ordinance once again |url=https://www.arlnow.com/2025/07/10/appeals-court-flip-flops-on-missing-middle-striking-down-ordinance-once-again/ |access-date=20 July 2025 |work=ArlNow |date=July 10, 2025}}</ref>

==Geography==
Arlington County, which is located in the [[Washington metropolitan area]] and the [[Northern Virginia]] region, is surrounded by Fairfax County and Falls Church to the west, the city of Alexandria to the southeast, and [[Washington, D.C.]] to the northeast across the [[Potomac River]]. It occupies 26 square miles and is the smallest self-governing county in the United States.<ref name = "Arl Fast Facts"/> Arlington is mostly within boundaries that were defined when it was made part of the District of Columbia in 1791; Arlington's irregular southeast border with Alexandria developed after several annexations by Alexandria that took place in the first half of the 20th century and was finalized in 1966.<ref>{{cite book |last1=Va. County Manager Arlington Co. |title=A History of the Boundaries of Arlington County, Virginia |date=1967 |publisher=Office of the County Manager |location=Arlington, Virginia |url=https://www.gutenberg.org/cache/epub/36902/pg36902-images.html |access-date=31 July 2025}}</ref><ref>{{cite web |title=Alexandria's Changing Borders |url=https://www.alexandriava.gov/historic-alexandria/alexandrias-changing-borders |website=alexandriava.gov |publisher=City of Alexandria |access-date=1 August 2025}}</ref>

===Geology and terrain===
Arlington County exists on a [[fall line]] between the Appalachian [[Piedmont (United States)|Piedmont]] and the [[Atlantic Plain|Atlantic Coastal Plain]].<ref name = "Geological Map">{{harvnb|Frost|Ernest|1999}}</ref> The fall line between these [[geologic provinces]] follows Interstate 66 between Rosslyn and Four Mile Run, and cuts south to the county border around U.S. Route 50.<ref name = "Geological Map"/> Arlington's Piedmont [[terrain]] is characterized by highly [[Erosion|eroded]] rolling [[Hill|hills]]; the county's highest prominence, Minor's Hill, is in this area and rises 451 [[Foot (unit)|feet]] above [[sea level]].<ref name = "Geological Map"/> The Coastal Plain is generally flat. Arlington is drained by [[Four Mile Run]], [[Pimmit Run]], and other small [[Stream|streams]] that all flow into the Potomac River.<ref name = "Geological Map"/> Some of these waterways have deep [[Valley|valleys]] that have been cut by erosion.<ref name = "Geological Map"/>

===Climate===
[[File:Glencarlyn Park Footbridge ruins 2019a.jpg|thumb|The footbridge over [[Four Mile Run]], destroyed by July 2019 flooding in [[Glencarlyn, Virginia|Glencarlyn]]]]
Arlington County has a [[humid subtropical climate]] that is characterized by hot, humid summers and mild to moderately cold winters. Based on climate data captured at the National Weather Service's Reagan National Airport station, regional seasonal extremes vary from average lows of {{convert|14.3|°F|°C|0}} in January to average highs of {{convert|98.1|°F|°C|0}} in July. Annual precipitation averages  41.82 inches, with an average low of 2.86 inches in January and average high of 4.33 inches in July. The average annual snowfall is 13.7 inches, with most of this falling in February. 

[[File:DCA Blizzard 02 2010 9127.JPG|thumb|Cars covered by snow near the end of the 2010 blizzard in [[Pentagon City]]]]

Arlington can experience [[extreme weather]] events, such as [[Atlantic hurricane|hurricanes]] and [[Blizzard|blizzards]]. These have included [[Hurricane Agnes|Agnes]] in 1972, [[Hurricane Isabel|Isabel]] in 2003, and the 2010 [[February 5–6, 2010 North American blizzard|"Snowmaggedon"]] snowstorm; both hurricanes caused severe [[Flood|flooding]] and property damage,<ref>{{cite book |last1=Bailey |first1=J. F. |last2=Patterson |first2=J. L. |last3=Paulhus |first3=J. L. H. |title=Hurricane Agnes Rainfall and Floods, June-July 1972 |date=1975 |publisher=U.S. Geological Survey and National Oceanic and Atmospheric Administration |location=Washington, D.C. |page=85 |url=https://pubs.usgs.gov/pp/0924/report.pdf |access-date=22 July 2025}}</ref><ref>{{cite book |last1=Barksdale |first1=Benjamin |title=Arlington County Fire Department: Developing a Damage Assessment Operating Procedure |date=September 2007 |publisher=National Fire Academy |pages=6-7 |url=https://apps.usfa.fema.gov/pdf/efop/efo41154.pdf |access-date=22 July 2025}}</ref> and the 2010 blizzard brought over 13 inches of snowfall in some areas.<ref>{{cite web |title=NWS Sterling Events Archive - Snowfall Totals ending February 10, 2010 |url=https://www.weather.gov/lwx/events_20100210 |website=weather.gov |publisher=National Weather Service |access-date=22 July 2025}}</ref> Extreme flooding of waterways such as Four Mile Run has in the past caused extensive damage to residential neighborhoods, particularly in the 1960s and 1970s before parts of the stream were [[River engineering#Channelization|channelized]] by the [[U.S. Army Corps of Engineers]] in 1980s; this was a result of the county's rapid 20th century development, much of which occurred before the introduction of modern stormwater management regulations.<ref name = "Flood resistant Arlington">{{cite web |title=A Flood Resistant Arlington, Story Map: Challenges and Paths Forward |url=https://storymaps.arcgis.com/stories/d0bb906589d144e5939281b60160b583 |website=storymaps.arcgis.com |publisher=County of Arlington, Virginia |access-date=22 July 2025}}</ref> Growth in Arlington's [[Impervious surface|impervious surfaces]], the majority of which has been driven by redevelopment of single family homes, has continued to present challenges to the county's stormwater management.<ref name = "Flood resistant Arlington"/> Localized flooding events after intense rainfall, particularly during the summer months, have occasionally been destructive to residential neighborhoods and infrastructure. For example, a July 2019 weather event later categorized as an 150-year storm resulted in hourly rainfall rates of 7 to 9 inches, which caused Four Mile Run to rise 11 feet within an hour.<ref>{{harvnb|Goodall|Elias|Andrews|Chope|Cosgrove|El Koubi|Irish|Lawrence|Lazaro|Leighty|Luckenbach|Miller-Hooks|Phillips|Pollard|Steinhilber|Feigenoff|Sayegh|2021|p=4}}</ref> This has required the periodic [[dredging]] of Four Mile Run to ensure it can accommodate for 100-year storms.<ref>{{cite web |title=Four Mile Run Channel Maintenance and Dredging Project |url=https://www.arlingtonva.us/Government/Projects/Project-Types/Environment-Projects/Four-Mile-Run-Channel-Maintenance-and-Dredging-Project |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=24 July 2025}}</ref> Due to global [[climate change]], the frequency and extremity of these occurrences has increased in recent years; this trajectory is expected to continue as the broader climate warms.<ref>{{harvnb|Goodall|Elias|Andrews|Chope|Cosgrove|El Koubi|Irish|Lawrence|Lazaro|Leighty|Luckenbach|Miller-Hooks|Phillips|Pollard|Steinhilber|Feigenoff|Sayegh|2021|pp=vii-viii}}</ref><ref>{{cite web |title=Community Climate Outlook: Arlington County, VA |url=https://www.marisa.psu.edu/misc/outlooks/2022-01-11/VA/Arlington_County_VA.pdf |website=marisa.psu.edu |publisher=Mid-Atlantic Regional Integrated Sciences and Assessments |access-date=22 July 2025}}</ref>

{{Washington, D.C. weatherbox}}

===Urban landscape===
{{see also|List of neighborhoods in Arlington County, Virginia}}
[[File:ArlingtonTODimage3.jpg|thumb|Aerial view of the growth pattern in Arlington County. High density, [[mixed-use development]] is concentrated within 1/4 to 1/2 mile from the county's [[Orange Line (Washington Metro)|Metrorail]] stations, such as in [[Rosslyn, Virginia|Rosslyn]], [[Court House, Arlington, Virginia|Courthouse]], and [[Clarendon, Virginia|Clarendon]] (shown in red from upper left to lower right).]]

Since the opening of Metro service in the 1970s, Arlington County has become heavily urbanized; the local government has actively encouraged this via its [[smart growth]], "Bull's Eye" urban planning model, where high density, mixed-use development is promoted within walking distance of Metro stations.<ref name = "Smart Growth>{{cite web |title=Smart Growth |url=https://www.arlingtonva.us/Government/Projects/Planning/Smart-Growth |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=22 July 2025}}</ref> Adopted in the county's General Land Use Plan (GLUP) since 1975, the impact of this policy is evident in the Rosslyn-Ballston corridor along the Orange and Silver lines and in the Richmond Highway Metro corridor along the Blue and Yellow Lines.<ref name = "Smart Growth/><ref name = "Rosslyn-Ballston Corridor">{{cite web |title=Rosslyn-Ballston Corridor |url=https://www.arlingtonva.us/Government/Projects/Planning/Smart-Growth/Rosslyn-Ballston-Corridor |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=22 July 2025}}</ref> County planners have termed neighborhoods within the corridors as "urban villages", where each is intended to have unique amenities and characteristics.<ref name = "Rosslyn-Ballston Corridor"/> These areas are rated highly for their walkability, access to public transit, and environmental sustainability, which align with design principles formulated by the [[United States Environmental Protection Agency|U.S. Environmental Protection Agency (EPA)]] in 1996.<ref name = "Smart Growth/> Arlington's approach to urban planning has been recognized by several organizations, including the EPA, which awarded Arlington with its National Award for Smart Growth Achievement for Overall Excellence in Smart Growth in 2002,<ref>{{cite web |title=National Award for Smart Growth Achievement 2002 |url=https://www.epa.gov/sites/default/files/2014-04/documents/2002_sg_awards.pdf |website=epa.gov |publisher=U.S. Environmental Protection Agency |access-date=22 July 2025}}</ref> and the [[American Planning Association]], which awarded Arlington's GLUP with its National Planning Achievement Gold Award for Implementation in 2017.<ref>{{cite web |title=National Planning Achievement Awards 2017 |url=https://www.planning.org/awards/2017/achievement/ |website=planning.org |publisher=American Planning Association |access-date=22 July 2025}}</ref>

Outside of its urban districts, Arlington is mostly residential and suburban in character; single-family homes consisted of around 75% of its total land area in 2023.<ref>{{cite news |last1=Barthel |first1=Margaret |title=After Bruising Debate, Arlington Passes ‘Missing Middle’ Zoning Change |url=http://dcist.com/story/23/03/23/arlington-ends-single-family-residential-zoning/ |access-date=23 July 2025 |work=dcist - WAMU |date=March 23, 2023}}</ref> Garden apartment complexes, which were built most prolifically between the New Deal era and the post-war period, exist throughout the county.<ref>{{cite web |title=Garden Apartments, Apartment Houses, and Apartment Complexes in Arlington County |url=https://www.dhr.virginia.gov/historic-registers/000-8825/ |website=dhr.virginia.gov |publisher=Virginia Department of Historic Resources |access-date=23 July 2025}}</ref> Several major [[Arterial road|arterial roads]] and [[Highway|highways]], including Interstate 395, Interstate 66, U.S. Route 50, and U.S. Route 1 run through Arlington and connect it with the broader Washington metropolitan area.<ref>{{cite web |title=Arlington County Street Map, 2nd Edition |url=https://arlgis.arlingtonva.us/web_files/Maps/Standard_Maps/StreetMap_2ndEd.pdf |website=arlgis.arlingtonva.us |publisher=County of Arlington, Virginia |access-date=22 July 2025}}</ref>

===Ecology===
Arlington's urbanization during the 20th century greatly impacted its local ecosystem, with many of its natural stream, wetland, and forest environments being buried, reclaimed, or removed to facilitate development; a 2011 study found that only around 738 acres of land, or 4.4% of the total land area in the county, qualified as "historical natural areas".<ref>{{harvnb|Zell|2011|pp=8-9}}</ref> Animals that have adapted well to these conditions, including [[Raccoon|raccoons]] and [[Red fox|red foxes]], are abundant.<ref>{{harvnb|Zell|2011|pp=27, 29-30}}</ref> [[White-tailed deer]], which were mostly eradicated from Virginia by 1900, have rebounded significantly in Arlington since [[Species reintroduction|reintroduction]] and [[Wildlife conservation|conservation]] programs were instituted statewide beginning in the 1940s;<ref>{{cite web |title=Deer in Arlington |url=https://www.arlingtonva.us/Government/Departments/Parks-Recreation/Parks-Recreation-News/Deer-in-Arlington |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=23 July 2025}}</ref> the county is working to develop a plan to actively manage deer to address concerns about overpopulation.<ref>{{cite web |title=Deer Management Program |url=https://www.arlingtonva.us/Government/Projects/Project-Types/Parks-Projects/Deer-Management-Program |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=23 July 2025}}</ref> Around half of plants found in the county are non-native; [[Invasive species in the United States|invasive species]], including numerous varieties of vine such as [[Hedera helix|English Ivy]] and [[Kudzu]], have been documented in Arlington.<ref>{{cite web |title=Nonnative and Invasive Plants of Arlington County, Virginia |url=https://www.arlingtonva.us/files/sharedassets/public/v/3/environment/documents/nonnative-invasive-species-arlington.pdf |website=arlingtonva.us |publisher=Arlington County Department of Parks and Recreation |access-date=23 July 2025}}</ref>

[[File:Four Mile Run wetland.jpg|thumb|alt=Restored wetlands and living shoreline along lower Four Mile Run in 2025|The wetlands and shoreline along lower [[Four Mile Run]] in 2025]]
Arlington has attempted to address its [[environmental degradation]], particularly in its watershed,<ref>{{cite web |title=Watershed Retrofit Study |url=https://www.arlingtonva.us/Government/Projects/Plans-Studies/Environment/Watershed-Retrofit-Study |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=23 July 2025}}</ref> which has been partially [[Ecological restoration|restored]] over the past several decades to improve local [[water quality]] and provide habitat for local wildlife.<ref>{{cite web |title=Sustainability and Environment |url=https://www.arlingtonva.us/Government/Programs/Sustainability |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=23 July 2025}}</ref> Past projects have included the installation of [[Living shoreline|living shorelines]] populated with native plants, removal of invasive vegetation along the lower Four Mile Run, and the conversion of [[Detention basin|stormwater catchment ponds]] into wetland habitats.<ref>{{cite web |title=Four Mile Run Stream Restoration |url=https://www.arlingtonva.us/Government/Projects/Project-Types/Environment-Projects/Four-Mile-Run-Stream-Restoration |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=23 July 2025}}</ref><ref>{{cite web |title=Ballston Wetland Park |url=https://www.arlingtonva.us/Government/Projects/Project-Types/Environment-Projects/Ballston-Wetland-Park-Project |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=23 July 2025}}</ref> One 2011 restoration initiative revived a globally rare [[Magnolia bog]] ecosystem that was discovered in Barcroft Park.<ref>{{cite web |title=Arlington’s Magnolia Bog |url=https://www.arlingtonva.us/Government/Programs/Sustainability/Ecology/Habitat-Restoration/Arlingtons-Magnolia-Bog |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=1 August 2025}}</ref> The efforts enhanced habitats for Arlington's many native mammals, birds, reptiles, amphibians, and insects.<ref>{{cite web |title=Sparrow Pond Restoration |url=https://www.arlingtonva.us/Government/Projects/Project-Types/Environment-Projects/Sparrow-Pond-Restoration |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=23 July 2025}}</ref> Native fish that inhabit Arlington's waterways include [[American eel]], [[Eastern blacknose dace]], and [[White sucker]]; invasive species like [[Northern snakehead|snakehead]] and [[Common carp|carp]] are also present.<ref>{{cite web |title=Fishes of Arlington |url=https://www.arlingtonva.us/files/sharedassets/public/v/1/environment/documents/fishes-of-arlington.pdf |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=23 July 2025}}</ref> The county government actively monitors the water quality and ecosystem of its watershed via a series of stream monitoring stations.<ref>{{cite web |title=Stream Monitoring |url=https://www.arlingtonva.us/Government/Programs/Sustainability/Streams/Stream-Monitoring |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=23 July 2025}}</ref>

==Demographics==
{{US Census population
|1800= 5949
|1810= 8552
|1820= 9703
|1830= 9573
|1840= 9967
|1850= 10008
|1860= 12652
|1870= 16755
|1880= 17546
|1890= 18597
|1900= 6430
|1910= 10231
|1920= 16040
|1930= 26615
|1940= 57040
|1950= 135449
|1960= 163401
|1970= 174284
|1980= 152599
|1990= 170936
|2000= 189453
|2010= 207627
|2020= 238643
|align-fn=center
|footnote=U.S. Decennial Census<ref name="DecennialCensus">{{cite web|url=https://www.census.gov/prod/www/decennial.html|title=Census of Population and Housing from 1790-2000|publisher=[[US Census Bureau]]|access-date=January 24, 2022}}</ref><br />1790-1960<ref>{{cite web|url=http://mapserver.lib.virginia.edu|title=Historical Census Browser|publisher=University of Virginia Library|access-date=January 2, 2014}}</ref> 1900-1990<ref>{{cite web|url=https://www.census.gov/population/cencounts/va190090.txt|title=Population of Counties by Decennial Census: 1900 to 1990|publisher=United States Census Bureau|access-date=January 2, 2014}}</ref><br />1990-2000<ref>{{cite web|url=https://www.census.gov/population/www/cen2000/briefs/phc-t4/tables/tab02.pdf |archive-url=https://ghostarchive.org/archive/20221009/https://www.census.gov/population/www/cen2000/briefs/phc-t4/tables/tab02.pdf |archive-date=October 9, 2022 |url-status=live|title=Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000|publisher=United States Census Bureau|access-date=January 2, 2014}}</ref><br />2010-2020<ref>{{cite web|url=https://www.census.gov/library/visualizations/interactive/2020-population-and-housing-state-data.html|title=2020 Population and Housing State Data|publisher=United States Census Bureau|access-date=August 14, 2021}}</ref> 2010<ref name=2010CensusP2/> 2020<ref name=2020CensusP2/>
}}

{| class="wikitable" style="text-align:center;"
|+'''Arlington County, Virginia – Racial and ethnic composition'''<br /><small>{{nobold|''Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.''}}</small>
!Race / Ethnicity <small>(''NH = Non-Hispanic'')</small>
!Pop 2010<ref name=2010CensusP2>{{Cite web|title=P2 Hispanic or Latino, and Not Hispanic or Latino by Race – 2010: DEC Redistricting Data (PL 94-171) - Arlington County, Virginia|url=https://data.census.gov/cedsci/table?q=p2&g=0500000US51013&tid=DECENNIALPL2010.P2|website=[[United States Census Bureau]]}}</ref>
!Pop 2020<ref name=2020CensusP2>{{Cite web|title=P2 Hispanic or Latino, and Not Hispanic or Latino by Race – 2020: DEC Redistricting Data (PL 94-171) - Arlington County, Virginia|url=https://data.census.gov/cedsci/table?q=p2&g=0500000US51013&tid=DECENNIALPL2020.P2|website=[[United States Census Bureau]]}}</ref>
!% 2010
!% 2020
|-
|[[Non-Hispanic or Latino whites|White]] alone (NH)
|132,961
|139,653
|64.04%
|58.52%
|-
|[[Non-Hispanic or Latino African Americans|Black or African American]] alone (NH)
|17,088
|20,330
|8.23%
|8.52%
|-
|[[Native Americans in the United States|Native American]] or [[Alaska Native]] alone (NH)
|394
|258
|0.19%
|0.11%
|-
|[[Asian Americans|Asian]] alone (NH)
|19,762
|27,235
|9.52%
|11.41%
|-
|[[Pacific Islander Americans|Pacific Islander]] alone (NH)
|133
|118
|0.06%
|0.05%
|-
|[[Race and ethnicity in the United States census|Some Other Race]] alone (NH)
|611
|1,491
|0.29%
|0.62%
|-
|[[Multiracial Americans|Mixed Race or Multi-Racial]] (NH)
|5,296
|12,196
|2.55%
|5.11%
|-
|[[Hispanic and Latino Americans|Hispanic or Latino]] (any race)
|31,382
|37,362
|15.11%
|15.66%
|-
|'''Total'''
|'''207,627'''
|'''238,643'''
|'''100.00%'''
|'''100.00%'''
|}

The 2020 Census found that Arlington County's total population had reached 238,643, which represents growth of 14.9% since the 2010 Census. Arlington's population increase was 9.7% of growth experienced throughout the Northern Virginia region, and 4.9% of Virginia overall.<ref>{{cite book |title=2020 Census Redistricting Data |date=September 2021 |publisher=Arlington County Department of Community Planning, Housing and Development |location=Arlington, Virginia |page=2 |url=https://www.arlingtonva.us/files/sharedassets/public/v/1/topics/documents/2020-census-arlington-county-va-summary-september-2021-_final.pdf |access-date=24 July 2025}}</ref> Arlington continued to become more racially and ethnically diverse, with Arlington's Non-Hispanic White population growing 5%, but falling to 58.52% of the total population from 64.04% in 2010. Arlington's Asian population grew by 37.8% – the most of any single-racial group – during this period,<ref name = "Census report p. 4">{{cite book |title=2020 Census Redistricting Data |date=September 2021 |publisher=Arlington County Department of Community Planning, Housing and Development |location=Arlington, Virginia |page=4 |url=https://www.arlingtonva.us/files/sharedassets/public/v/1/topics/documents/2020-census-arlington-county-va-summary-september-2021-_final.pdf |access-date=24 July 2025}}</ref> and reached a population share of 11.41%. Those that identified as multi-racial or another race not listed in the census had the highest growth rates among all groups.<ref name = "Census report p. 4"/> Arlington had a total of 119,085 housing units, representing an increase of 13,681 units from 2010.<ref>{{cite book |title=2020 Census Redistricting Data |date=September 2021 |publisher=Arlington County Department of Community Planning, Housing and Development |location=Arlington, Virginia |page=7 |url=https://www.arlingtonva.us/files/sharedassets/public/v/1/topics/documents/2020-census-arlington-county-va-summary-september-2021-_final.pdf |access-date=24 July 2025}}</ref>

According to [[American Community Survey|American Community Survey's]] 2023 estimates, Arlington's median age was 35.7,<ref name = "Age and sex">{{cite web |title=Age and Sex, American Community Survey, ACS 1-Year Estimates Subject Tables |url=https://data.census.gov/table/ACSST1Y2023.S0101?g=050XX00US51013 |website=US Census Bureau |access-date=25 July 2025}}</ref> with 12.4% of individuals being above 65.<ref>{{cite web |title=ACS Demographic and Housing Estimates. |url=https://data.census.gov/table/ACSDP5Y2023.DP05?g=060XX00US5101390072 |website=US Census Bureau |access-date=25 July 2025}}</ref> Adults aged between 25 and 29 are the largest age bracket and make up 12.8% of the total population.<ref name = "Age and sex"/> 77.7% of the population has attained a bachelor's degree or higher; 42% of residents have a Master's or professional degree.<ref>{{cite web |title=Educational Attainment. |url=https://data.census.gov/table/ACSST5Y2023.S1501?g=060XX00US5101390072 |website=US Census Bureau |access-date=25 July 2025}}</ref> 21.7% of Arlington's population is foreign-born; 48.4% of this segment are non-U.S. citizens.<ref>{{cite web |title=Selected Social Characteristics in the United States. |url=https://data.census.gov/table/ACSDP5Y2023.DP02?g=060XX00US5101390072 |website=US Census Bureau |access-date=25 July 2025}}</ref> Married couple family households make up 36.7% of households; 44% of residents have never married.<ref>{{cite web |title=Marital Status. |url=https://data.census.gov/table/ACSST5Y2023.S1201?g=060XX00US5101390072 |website=US Census Bureau |access-date=25 July 2025}}</ref>

==Economy==
In 2023, Arlington County's GDP totaled $47.3 billion.<ref>{{cite web |title=Gross Domestic Product: All Industries in Arlington County, VA |url=https://fred.stlouisfed.org/series/GDPALL51013 |website=fred.stlouisfed.org |publisher=U.S. Bureau of Economic Analysis |access-date=29 July 2025}}</ref> Given its proximity to Washington, Arlington's economy is especially focused on the federal government, with many of its corporations providing consulting, engineering, or technology services to defense and civilian agencies.<ref>{{cite book |title=Economic Development Strategic Plan |date=May 2024 |publisher=Arlington Economic Development |location=Arlington, Virginia |page=7 |url=https://www.arlingtoneconomicdevelopment.com/files/sharedassets/aed/v/2/all-pdfs/arlington-economic-development-strategic-plan_web_final.pdf |access-date=29 July 2025}}</ref> As the location of the Pentagon, the [[Joint Base Myer–Henderson Hall]] military installation, and other federal institutions, the federal government itself is also a significant contributor to the county's economic activity. Firms with business outside of the federal sector have also set up operations and headquarters in Arlington over the past several decades; the county government has actively pursued this, particularly in the technology space, through tax incentives and other measures.<ref>{{cite web |last1=Touhill |first1=Ryan |title=From the Director: New Strategic Investments in Economic Development |url=https://www.arlingtoneconomicdevelopment.com/News-Resources/Blog/From-the-Director-New-Strategic-Investments-in-Economic-Development#:~:text=The%20AIF%20is%20a%20logical,allow%20for%20newer%20technology%20ventures. |website=arlingtoneconomicdevelopment.com |publisher=Arlington Economic Development |access-date=29 July 2025}}</ref> 

===Employers and workforce===
{{see also|List of federal agencies in Northern Virginia|List of companies headquartered in Northern Virginia}}
{| class="wikitable" style="float:right; margin:10px"
|-
! #
! Top Employers, FY 2024<ref>{{cite book |last1=Arlington Department of Management and Finance |title=Annual Comprehensive Financial Report: Fiscal Year Ended June 30, 2024 |date=2024 |publisher=County of Arlington, Virginia |location=Arlington |page=285 |url=https://www.arlingtonva.us/files/sharedassets/public/v/2/budget/documents/accounting-reporting-and-control/final-acfr-fy2024_12-13-2024-online.pdf}}</ref>
|-
|1
|[[Federal government of the United States|Federal government]]
|-
|2
|Local government & schools
|-
|3
|[[Amazon (company)|Amazon]]
|-
|4
|[[Deloitte]]
|-
|5
|[[Accenture]]
|-
|6
|Virginia Hospital Center
|-
|7
|[[Booz Allen Hamilton]]
|-
|8
|[[Gartner]]
|-
|9
|[[Lidl]]
|-
|10
|[[Bloomberg BNA]]
|-
|11
|[[Nestlé]]
|-
|12
|[[Guidehouse]]
|-
|13
|[[Marymount University]]
|-
|14
|[[Politico]]
|-
|15
|[[PBS]]
|-
|16
|[[Boeing]]
|-
|17
|[[RAND Corporation]]
|-
|18
|[[CNA (nonprofit)|CNA]]
|-
|19
|Oracle Corporation
|-
|20
|[[Science Applications International Corporation|SAIC]]
|}
Arlington County's economy is primarily [[Service economy|service-based]], with a majority of its estimated 221,200 workers employed in professional services, technology companies, and federal, state, and municipal government in 2025; public employees made up around 20% of the workforce.<ref name = "Profile 2025 p. 11">{{harvnb|Arlington County Department of Community Planning, Housing, and Development|2025|p=11}}</ref> Many private companies with a presence in Arlington serve various government agencies in Washington as [[Government contractor|contractors]], including [[Deloitte]], [[Booz Allen Hamilton]], and [[Accenture]]. Large [[Arms industry|defense]] and [[Aerospace manufacturer|aerospace]] corporations such as [[Boeing]], [[RTX Corporation]], and [[Lockheed Martin]] are either headquartered or have offices in Arlington. Corporations either unaffiliated with or that have operations outside of the public sector, like Amazon, [[CoStar Group|Costar]], and [[Nestlé]], have also established themselves in Arlington.<ref>{{cite web |title=Major Companies |url=https://www.arlingtoneconomicdevelopment.com/Locate-in-Arlington/Major-Companies |website=arlingtoneconomicdevelopment.com |publisher=Arlington Economic Development |access-date=29 July 2025}}</ref> Outside of companies and government entities, Arlington also hosts a number of non-profit organizations and advocacy groups.<ref>{{cite web |title=Community Organizations |url=https://www.arlingtonva.us/Government/Topics/Community/Organizations |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=29 July 2025}}</ref>

[[File:Rosslyn Skyline from Theodore Roosevelt Bridge.png|thumb|alt=Rosslyn skyline in 2020. Rosslyn is one of Arlington's main business districts|The skyline of Rosslyn, a main business district in Arlington County, in 2020]]

70% of all jobs in Arlington are in the county's "planning corridors", which include Rosslyn-Ballston, Richmond Highway, Columbia Pike, and Langston Boulevard; most of Arlington's jobs are located in the Rosslyn-Ballston area.<ref name = "Profile 2025 p. 12">{{harvnb|Arlington County Department of Community Planning, Housing, and Development|2025|p=12}}</ref> These districts are also home to Arlington's largest retail facilities, such as the Fashion Center at Pentagon City and Ballston Quarter.<ref name = "Profile 2025 p. 13">{{harvnb|Arlington County Department of Community Planning, Housing, and Development|2025|p=13}}</ref> Work from home arrangements, which spiked during the COVID-19 pandemic, continue to persist in the post-pandemic era, with 31.5% of workers working full time from their place of residence in 2023.<ref>{{cite web |title=Commuting Characteristics by Sex. |url=https://data.census.gov/table/ACSST5Y2023.S0801?g=060XX00US5101390072 |website=US Census Bureau |access-date=25 July 2025}}</ref> This has contributed to Arlington's office vacancy rate, which rose to 24.2% in the fourth quarter of 2024 from 14.6% in 2020.<ref name = "Profile 2025 p. 13"/>

Arlington's unemployment rate, which rose to 4.3% during the height of the COVID-19 pandemic in 2020, has been consistently under the average for the Washington metropolitan area since at least 2015.<ref name = "Profile 2025 p. 11"/> High levels of employment in the public sector has made Arlington vulnerable to cuts in federal government spending;<ref>{{cite news |last1=Partridge |first1=Helen |title=Arlington Officials Offer Sobering Economic Outlook Amid Federal Cuts |url=https://www.arlingtonmagazine.com/arlington-va-economy-federal-cuts/ |access-date=28 July 2025 |work=Arlington Magazine |date=May 20, 2025}}</ref> this has been particularly acute in the [[Second presidency of Donald Trump|second Trump Administration]], during which Arlington's unemployment rate rose to 3.3% in May 2025 as a result of broad spending cuts, [[2025 United States federal mass layoffs|layoffs]], and contract cancellations across numerous government agencies.<ref>{{cite news |last1=McCaffrey |first1=Scott |title=Arlington unemployment rate reaches highest point since the pandemic |url=https://www.arlnow.com/2025/07/14/arlington-unemployment-rate-reaches-highest-point-since-the-pandemic/ |access-date=28 July 2025 |work=ArlNow |date=July 14, 2025}}</ref>

===Income and housing===
With a mean annual income estimated at $114,097,<ref>{{cite web |title=Mean Income in the Past 12 Months (in 2023 Inflation-Adjusted Dollars) |url=https://data.census.gov/table/ACSST1Y2023.S1902?t=Income+and+Poverty&g=050XX00US51013 |website=US Census Bureau |access-date=25 July 2025}}</ref> Arlington is one of the wealthiest municipalities in the United States; 31.3% of households had an annual income of $200,000 or more.<ref name = "Profile 2025 p. 9">{{harvnb|Arlington County Department of Community Planning, Housing, and Development|2025|p=9}}</ref> Arlington's wealth is not equally distributed geographically or by racial background and tends to be concentrated in its wealthier northern neighborhoods that have a higher share of white households. Arlington's southern areas, which have greater racial and ethnic diversity and a higher population of immigrant families, have lower incomes and higher levels of poverty.<ref>{{cite news |last1=Koma |first1=Alex |title=New Research Reveals Opportunity Gap Between North and South Arlington Neighborhoods |url=https://www.arlnow.com/2018/10/08/new-research-reveals-opportunity-gap-between-north-and-south-arlington-neighborhoods/ |access-date=28 July 2025 |work=ArlNow |date=October 8, 2018}}</ref> This has been attributed to the county's historical underinvestment in the infrastructure and economy of southern Arlington, which is the location of several of Arlington's formerly segregated, historically black neighborhoods.<ref>{{cite news |last1=Thurston |first1=Stephen G. |title=Are There Two Arlingtons? |url=https://www.arlingtonmagazine.com/are-there-two-arlingtons/ |access-date=29 July 2025 |work=Arlington Magazine |date=April 27, 2015}}</ref> Overall, 7.3% of Arlington residents were below the national poverty level in 2023.<ref name = "Profile 2025 p. 9"/>

Arlington had an estimated total of 126,540 housing units in 2025, representing 6.3% growth since 2020. 73% of its housing supply consists of multifamily apartments or condos.<ref name = "Profile 2025 p. 7>{{harvnb|Arlington County Department of Community Planning, Housing, and Development|2025|p=7}}</ref> More than 38% of homes in Arlington are valued at $1 million or more, and the home ownership rate stands at 41.1%.<ref name = "Selected housing characteristics">{{cite web |title=Selected Housing Characteristics. |url=https://data.census.gov/table/ACSDP5Y2023.DP04?g=060XX00US5101390072 |website=US Census Bureau |access-date=25 July 2025}}</ref> The average rent in 2024 was $2,549;<ref name = "Profile 2025 p. 7/> Arlington was identified as one of the most expensive rental markets in the United States outside of California by several real estate firms in 2025.<ref>{{cite news |last1=McCaffrey |first1=Scott |title=Rent still rising in Arlington, new data shows |url=https://www.arlnow.com/2025/04/30/rent-prices-are-still-rising-in-arlington-new-data-shows/ |access-date=28 July 2025 |work=ArlNow |date=April 30, 2025}}</ref> About 8.9% of Arlington's total housing supply consisted of affordable housing units in 2025.<ref name = "Profile 2025 p. 7/> [[Homelessness]] in Arlington has been trending upwards since 2021; as of 2025, there were 271 homeless individuals, which represented a 12% increase from 2024.<ref>{{cite web |title=Arlington County, VA Continuum of Care, 2025 Point-in-Time Count |url=https://www.arlingtonva.us/files/sharedassets/public/v/1/public-assistance/documents/2025-coc-pit-2-pager-final.pdf |website=arlingtonva.us |publisher=Arlington County Department of Human Services |access-date=29 July 2025}}</ref>

===Tourism===
According to a 2024 report by the county government, Arlington County attracted 7.1 million visitors in 2023, who generated $6.5 billion in economic activity from a total of $4.5 billion in spending.<ref name = "Tourism econ p. 4">{{harvnb|Tourism Economics|2024|p=4}}</ref> This activity, which is inclusive of spending at the county's travel centers like Ronald Reagan National Airport, supported 27,567 jobs and is representative of a broader recovery since the COVID-19 pandemic.<ref name = "Tourism econ p. 4"/><ref>{{harvnb|Tourism Economics|2024|p=5}}</ref> Employment in tourism and hospitality also increased during this period, but has yet to reach parity with pre-pandemic levels.<ref>{{harvnb|Tourism Economics|2024|p=8}}</ref>

==Culture==
Arlington County is within the Northern Virginia region, which has been described as being greatly influenced by its proximity to Washington and its employment opportunities in the federal government; this has attracted highly educated, affluent migrants from other states and countries, ultimately rendering the culture more international and [[Northern United States|northern]] in character relative to Virginia's southern regions.<ref>{{cite web |last1=Juday |first1=Lucas |title=10 ways to map Northern Virginia |url=https://www.coopercenter.org/research/10-ways-map-northern-virginia |website=coopercenter.org |publisher=University of Virginia Weldon Cooper Center for Public Service |access-date=31 July 2025}}</ref><ref>{{cite news |last1=Lindsay |first1=Drew |title=Will Northern Virginia Become the 51st State? |url=https://www.washingtonian.com/2008/11/01/will-northern-virginia-become-the-51st-state/ |access-date=31 July 2025 |work=Washingtonian Magazine |date=November 1, 2008}}</ref> Consequently, Arlington has communities and enclaves of various ethnic and cultural backgrounds. The Columbia Pike corridor, which has been a destination for immigrants since Southeast Asians began arriving after the [[Fall of Saigon]] in the 1970s,<ref>{{cite web |last1=Ruble |first1=Blair A. |title=Living Diversity: Documenting Arlington, Virginia Inclusive, Safe, Resilient, and Sustainable Communities |url=https://www.wilsoncenter.org/article/living-diversity-documenting-arlington-virginia-inclusive-safe-resilient-and-sustainable#:~:text=The%20area%20began%20to%20change,immigrants%20to%20the%20United%20States. |website=wilsoncenter.org |publisher=Woodrow Wilson International Center for Scholars |access-date=31 July 2025}}</ref> exemplifies this, and is today home to residents from over 150 different nationalities; it has become particularly known for its wide variety of international food options and venues.<ref>{{cite web |title=Columbia Pike |url=https://www.stayarlington.com/neighborhoods/columbia-pike/ |website=stayarlington.com |publisher=Arlington Convention and Visitor Services |access-date=31 July 2025}}</ref>

===Landmarks and attractions===
[[File:Tomb of the Unknown Soldier Centennial Commemoration Flower Ceremony - Day One at Arlington National Cemetery, Arlington, Virginia, November 9, 2021 - 2.jpg|thumb|alt=Centennial Commemoration Flower Ceremony at the Tomb of the Unknown Soldier|Centennial Commemoration Flower Ceremony at the [[Tomb of the Unknown Soldier]] at Arlington National Cemetery]]
Arlington County is home to [[Arlington National Cemetery]] and several prominent military and civilian memorials, including the [[United States Air Force Memorial|Air Force Memorial]], [[Marine Corps War Memorial]], and the [[Pentagon Memorial|National 9/11 Pentagon Memorial]]. Arlington National Cemetery attracts more than 3 million visitors annually,<ref>{{cite web |title=Visitor Tips |url=https://arlingtoncemetery.mil/Visit/Visitor-Tips |website=arlingtoncemetery.mil |publisher=Arlington National Cemetery |access-date=31 July 2025}}</ref> with many coming to observe memorials like the [[Tomb of the Unknown Soldier (Arlington National Cemetery)|Tomb of the Unknown Soldier]], which is guarded all year by the U.S. Army [[3rd Infantry Regiment (United States)|3rd Infantry]], the [[John F. Kennedy Eternal Flame|John F Kennedy Gravesite]], which memorializes former president John F Kennedy with an [[eternal flame]], and the [[Military Women's Memorial]], which honors all women that have served in the U.S. Armed Forces. Others visit Arlington National Cemetery to pay respects to or grieve for deceased soldiers and relatives; more than 400,000 members of the U.S. Armed Forces are buried in the cemetery.<ref>{{cite web |title=Arlington National Cemetery: Historical Expansion |url=https://arlingtoncemetery.mil/Expansion/Historical-Expansion |website=arlingtoncemetery.mil |publisher=Arlington National Cemetery |access-date=3 August 2025}}</ref> The cemetery offers interpretive group tours and tour bus services to its main memorials.<ref>{{cite web |title=Tours and Groups |url=https://www.arlingtoncemetery.mil/Visit/Tours-and-Groups |website=arlingtoncemetery.mil |publisher=Arlington National Cemetery |access-date=31 July 2025}}</ref> In addition, the National Park Service operates a museum in the historic Arlington House about the history of the Custis plantation, the estate's enslaved laborers and servants, and the life of Robert E. Lee.<ref>{{cite web |title=The Robert E. Lee Memorial |url=https://www.nps.gov/arho/index.htm |website=nps.gov |publisher=National Park Service |access-date=31 July 2025}}</ref>

Local museums in Arlington include the Arlington Historical Museum, which is located in the 1891 [[Hume School]] and run by the Arlington Historical Society,<ref>{{cite web |title=Arlington Historical Museum |url=https://www.stayarlington.com/directory/arlington-historical-society/ |website=stayarlington.com |publisher=Arlington Convention and Visitor Services |access-date=31 July 2025}}</ref> the Black Heritage Museum of Arlington, which details the history of Arlington's black community,<ref>{{cite web |title=Black Heritage Museum of Arlington |url=https://www.stayarlington.com/directory/the-black-heritage-museum-of-arlington-virginia/ |website=stayarlington.com |publisher=Arlington Convention and Visitor Services |access-date=31 July 2025}}</ref> and the [[Museum of Contemporary Art Arlington]], which is hosted in the historic [[Clarendon School]] building and is one of the largest non-federal contemporary art venues in the Washington metropolitan area.<ref>{{cite web |title=Museum of Contemporary Art Arlington |url=https://www.stayarlington.com/directory/museum-of-contemporary-art-arlington/ |website=stayarlington.com |publisher=Arlington Convention and Visitor Services |access-date=31 July 2025}}</ref>

===Annual events===
[[File:41st Marine Corps Marathon 161030-M-QS647-217.jpg|thumb|alt=Starting line of the 41st Marine Corps Marathon in 2016|The starting line of the 41st [[Marine Corps Marathon]] in 2016]]
Arlington County hosts a variety of events every year pertaining to culture and the arts, such as the Arlington County Fair, which was first held in 1977 as an event for local gardening clubs,<ref>{{cite web |title=About |url=https://arlingtoncountyfair.us/about/ |website=arlingtoncountyfair.us |publisher=Arlington County Fair |access-date=31 July 2025}}</ref> music festivals such as the Columbia Pike Blues Festival and Rosslyn Jazz Festival,<ref>{{cite web |title=Columbia Pike Blues Festival |url=https://www.arlingtonva.us/Government/Programs/Arts/Programs/Performing-Arts#section-2 |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=31 July 2025}}</ref><ref>{{cite web |title=Rosslyn Jazz Festival |url=https://www.arlingtonva.us/Government/Programs/Arts/Programs/Performing-Arts#section-4 |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=31 July 2025}}</ref> and summertime concerts held at the Lubber Run Amphitheater.<ref>{{cite web |title=Lubber Run Summer Concert Series |url=https://www.arlingtonva.us/Government/Programs/Arts/Programs/Performing-Arts#section-5 |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=31 July 2025}}</ref> Major sporting events include the [[Marine Corps Marathon]], whose course has run through Arlington every fall since 1976,<ref>{{cite web |title=History |url=https://www.marinemarathon.com/history/ |website=marinemarathon.com |publisher=Marine Corps Marathon Organization |access-date=31 July 2025}}</ref> and the [[Armed Forces Association Cycling Classic]], a summer [[road bicycle]] race which has been held in Arlington's [[Crystal City, Virginia|Crystal City]] and Clarendon neighborhoods since 1998.<ref>{{cite web |title=About Us |url=https://www.cyclingclassic.org/about-us |website=cyclingclassic.org |publisher=Arlington Sports, Inc. |access-date=31 July 2025}}</ref>

==Government and politics==
===Local government===
{| class="wikitable" style="float:right; margin:10px"
|+County board
|-
! colspan="2"  style="text-align:center; vertical-align:bottom;"| Position
! style="text-align:center;" | Name
! valign=bottom | Party
!  style="vertical-align:bottom; text-align:center;"| First elected
|-
| {{party color cell|Democratic Party (United States)}}&nbsp;
| Chair
|Takis Karatonis<ref>{{cite web |url=https://www.arlingtonva.us/Government/Departments/County-Board/County-Board-Members/Takis-P-Karantonis |title=Takis P. Karantonis - Chair, Arlington County Board|publisher=Arlingtonva.us|access-date=June 22, 2024}}</ref>
| style="text-align:center;" |[[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2020
|-
| {{party color cell|Democratic Party (United States)}}&nbsp;
| Vice-chair
| Matt de Ferranti<ref>{{Cite web | url=https://www.arlingtonva.us/Government/Departments/County-Board/County-Board-Members/Matt-de-Ferranti |title = Matt de Ferranti - Vice-Chair, Arlington County Board|publisher=Arlingtonva.us|access-date=June 22, 2024}}</ref>
| style="text-align:center;" | [[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2018
|-
| {{party color cell|Democratic Party (United States)}}&nbsp;
| Member
|Maureen Coffey<ref>{{cite web|url=https://www.arlingtonva.us/Government/Departments/County-Board/County-Board-Members/Maureen-Coffey|title=Maureen Coffey - Member, Arlington County Board|publisher=Arlingtonva.us|access-date=June 22, 2024}}</ref>
| style="text-align:center;" |[[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2023
|-
| {{party color cell|Democratic Party (United States)}}&nbsp;
| Member
| Susan Cunningham<ref>{{cite web|url=https://www.arlingtonva.us/Government/Departments/County-Board/County-Board-Members/Susan-Cunningham|title=Susan Cunningham - Member, Arlington County Board|publisher=Arlingtonva.us|access-date=June 22, 2024}}</ref>
| style="text-align:center;" |[[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2023
|-
| {{party color cell|Democratic Party (United States)}}&nbsp;
| Member
| JD Spain Sr.<ref>{{cite web|url=https://www.arlingtonva.us/Government/Departments/County-Board/County-Board-Members/Julius-D.-JD-Spain-Sr|title=Julius D. "JD" Spain, Sr. Member, Arlington County Board|publisher=Arlingtonva.us|access-date=January 3, 2025}}</ref>
| style="text-align:center;" |[[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2024
|}

{| class="wikitable" style="float:right; margin:10px"
|+Constitutional officers
|-
! colspan="2"  style="text-align:center; vertical-align:bottom;"| Position
! style="text-align:center;" | Name
! valign=bottom | Party
!  style="vertical-align:bottom; text-align:center;"| First elected
|-
| {{party color cell|Democratic Party (United States)}}
| Clerk of the Circuit Court
| Paul Ferguson<ref>{{cite web|url=http://courts.arlingtonva.us/circuit-court/paul-ferguson/|title=Paul Ferguson, Clerk
|work=Courts & Judicial Services|publisher=Arlingtonva.us|access-date=January 11, 2016}}</ref>
| style="text-align:center;" | [[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2007
|-
| {{party color cell|Democratic Party (United States)}}
| Commissioner of Revenue
|Ingrid Morroy<ref>{{cite web|url=http://newsroom.arlingtonva.us/bios/ingrid-morroy/|title=Ingrid Morroy - Commissioner of Revenue|work=Newsroom|publisher=Arlingtonva.us |access-date=January 11, 2016}}</ref>
| style="text-align:center;" | [[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2003
|-
| {{party color cell|Democratic Party (United States)}}
| Commonwealth's Attorney
| Parisa Dehghani-Tafti<ref>{{cite web|url=https://courts.arlingtonva.us/commonwealth-attorney/meet-parisa/|title=Meet Parisa
|work=Courts & Judicial Services|publisher=Arlingtonva.us|access-date=January 23, 2020}}</ref>
| style="text-align:center;" | [[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2019
|-
| {{party color cell|Democratic Party (United States)}}
| Sheriff
| Beth Arthur<ref>{{cite web|url=http://newsroom.arlingtonva.us/bios/beth-arthur/|title=Beth Arthur - Sheriff|work=Newsroom|publisher=Arlingtonva.us|access-date=January 11, 2016}}</ref>
| style="text-align:center;" | [[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2000
|-
| {{party color cell|Democratic Party (United States)}}
| Treasurer
| Carla de la Pava<ref>{{cite web|url=http://newsroom.arlingtonva.us/bios/carla-de-la-pava/|title=Carla de la Pava - Treasurer|work=Newsroom|publisher=Arlingtonva.us|access-date=January 11, 2016}}</ref>
| style="text-align:center;" | [[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2014
|}


Since 1930,<ref>{{cite web |title=Our Form of Government — County Manager Plan |url=https://www.arlingtonva.us/Government/Departments/CMO/County-Manager-Form-Government |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=26 July 2025}}</ref> Arlington County has been governed by a [[board of supervisors]] that appoint a [[County executive|County Manager]], the latter of which oversees the county's everyday operations, as well as its departments and offices that provide administrative and regulatory services.<ref>{{cite web |title=Departments & Offices |url=https://www.arlingtonva.us/Government/Departments |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=25 July 2025}}</ref> Each of the board's five members are elected [[at-large]] and serving staggered 4-year terms.<ref name = "County Board">{{cite web |title=About the County Board |url=https://www.arlingtonva.us/Government/County-Board/About-the-County-Board |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=25 July 2025}}</ref> Since 2023, [[Primary election|primary elections]] for county board seats have been conducted via [[Ranked-choice voting in the United States|ranked choice voting]].<ref name = "Arlington voter guide">{{cite news |last1=Barthel |first1=Margaret |title=Your voter guide to the Arlington County Board race |url=https://wamu.org/story/24/05/13/your-voter-guide-to-the-arlington-county-board-race/ |access-date=27 July 2025 |work=WAMU 88.5 |date=May 13, 2024}}</ref> Board members elect a chair, who serves as the official head of county government, and vice-chair at annual organizational meetings held every January.<ref name = "County Board"/> The elected board chair and vice-chair share the same duties and responsibilities of their peers, and do not possess the power to veto motions.<ref name = "County Board"/>

The board oversees various elements of county administration, including general policy, land use and zoning, tax rates, the issuance of proclamations, and the making of appointments to citizen advisory groups.<ref name = "County Board"/> The board also represents Arlington County at regional, state, and national forums and commissions.<ref name = "County Board"/> Other elected county officials include the [[school board]] and five constitutional officers, which consist of the [[Court clerk|County Clerk of the Circuit Court]], [[Commissioner of the Revenue]], [[District attorney|Commonwealth's Attorney]], [[Sheriff]], and [[Treasurer]].<ref>{{cite web |title=Organizational Chart |url=https://www.arlingtonva.us/Government/County-Leadership/Organizational-Chart |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=25 July 2025}}</ref>

===State and federal representation===
{| class="wikitable" style="float:right; margin:10px"
|+State Senators from Districts 39 and 40
|-
! colspan="2"  style="text-align:center; vertical-align:bottom;"| Name
! valign=bottom | Party
!  style="vertical-align:bottom; text-align:center;"| First elected
|-
| {{party color cell|Democratic Party (United States)}}&nbsp;
| [[Adam Ebbin]]<ref>{{cite web |title=Adam P. Ebbin |url=https://apps.senate.virginia.gov/Senator/memberpage.php?id=S85 |website=apps.senate.virginia.gov |publisher=Virginia General Assembly |access-date=25 July 2025}}</ref>
| style="text-align:center;" |[[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2012
|-
| {{party color cell|Democratic Party (United States)}}&nbsp;
| [[Barbara Favola]]<ref>{{cite web |title=Barbara A. Favola |url=https://apps.senate.virginia.gov/Senator/memberpage.php?id=S86 |website=apps.senate.virginia.gov |publisher=Virginia General Assembly |access-date=25 July 2025}}</ref>
| style="text-align:center;" | [[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2012
|}

{| class="wikitable" style="float:right; margin:10px"
|+Delegates from 1st, 2nd, and 3rd Districts
|-
! colspan="2"  style="text-align:center; vertical-align:bottom;"| Name
! valign=bottom | Party
!  style="vertical-align:bottom; text-align:center;"| First elected
|-
| {{party color cell|Democratic Party (United States)}}&nbsp;
| [[Patrick Hope]]<ref>{{cite web |title=Patrick A. Hope |url=https://virginiageneralassembly.gov/house/members/members.php?id=H0219 |website=virginiageneralassembly.gov |publisher=Virginia General Assembly |access-date=25 July 2025}}</ref>
| style="text-align:center;" |[[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2010
|-
| {{party color cell|Democratic Party (United States)}}&nbsp;
| [[Adele McClure|Adele Y. McClure]]<ref>{{cite web |title=Adele Y. McClure |url=https://virginiageneralassembly.gov/house/members/members.php?id=H0375 |website=virginiageneralassembly.gov |publisher=Virginia General Assembly |access-date=25 July 2025}}</ref>
| style="text-align:center;" | [[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2024
|-
| {{party color cell|Democratic Party (United States)}}&nbsp;
| [[Alfonso H. Lopez]]<ref>{{cite web |title=Delegate Alfonso Lopez |url=https://virginiageneralassembly.gov/house/members/members.php?id=H0239# |website=virginiageneralassembly.gov |publisher=Virginia General Assembly |access-date=25 July 2025}}</ref>
| style="text-align:center;" |[[Democratic Party of Virginia|Democratic]]
| style="text-align:center;" | 2012
|}

In Virginia's General Assembly, Arlington County is represented by three members of the [[Virginia House of Delegates|House of Delegates]] from the [[Virginia's 1st House of Delegates district|1st]], [[Virginia's 2nd House of Delegates district|2nd]], and [[Virginia's 3rd House of Delegates district|3rd]] Districts, and two members of the [[Virginia Senate|Senate]] from Districts [[Virginia's 39th Senate district|39]] and [[Virginia's 40th Senate district|40]].<ref name = "Elected Officials">{{cite web |title=Elected Officials |url=https://vote.arlingtonva.gov/Elections/Elected-Officials |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=25 July 2025}}</ref> Members of the House of Delegates and Senate serve two-year and four-year terms, respectively.<ref name = "Elected Officials"/>

In the lower chamber of the [[United States Congress|U.S. Congress]], Arlington is part of [[Virginia's 8th congressional district]] of the [[United States House of Representatives|House of Representatives]], which is represented by a single Representative elected every two years. [[Don Beyer]], a Democrat, has served in this position since 2015.<ref>{{cite web |title=About |url=https://beyer.house.gov/about/ |website=beyer.house.gov |publisher=Office of Representative Don Beyer |access-date=27 July 2025}}</ref> Virginia's two members in the [[United States Senate|Senate]] are elected on six-year terms.<ref name = "Elected Officials"/> These positions have been occupied by Democratic Senators [[Mark Warner]] since 2009 and [[Tim Kaine]] since 2013.<ref>{{cite web |title=Biography |url=https://www.warner.senate.gov/public/index.cfm/biography |website=warner.senate.gov |publisher=Office of Senator Mark Warner |access-date=27 July 2025}}</ref><ref>{{cite web |title=About |url=https://www.kaine.senate.gov/about |website=kaine.senate.gov |publisher=Office of Senator Tim Kaine |access-date=27 July 2025}}</ref>

===Politics===
{{PresHead|place=Arlington County, Virginia|source=<ref>{{cite web|url=http://uselectionatlas.org/RESULTS|title=Dave Leip's Atlas of U.S. Presidential Elections|first=David|last=Leip|website=uselectionatlas.org}}</ref>}}
<!-- PresRow should be {{PresRow|Year|Winning party|GOP vote #|Dem vote #|3rd party vote #|State}} -->
{{PresRow|1920|Republican|997|835|38|Virginia}}
{{PresRow|1924|Republican|1,307|1,209|405|Virginia}}
{{PresRow|1928|Republican|4,274|1,444|0|Virginia}}
{{PresRow|1932|Democratic|2,806|3,285|143|Virginia}}
{{PresRow|1936|Democratic|2,825|4,971|39|Virginia}}
{{PresRow|1940|Democratic|4,365|5,440|57|Virginia}}
{{PresRow|1944|Republican|8,317|7,122|60|Virginia}}
{{PresRow|1948|Republican|10,774|7,798|1,539|Virginia}}
{{PresRow|1952|Republican|22,158|14,032|190|Virginia}}
{{PresRow|1956|Republican|21,868|16,674|1,183|Virginia}}
{{PresRow|1960|Republican|23,632|22,095|250|Virginia}}
{{PresRow|1964|Democratic|20,485|33,567|311|Virginia}}
{{PresRow|1968|Republican|28,163|26,107|7,056|Virginia}}
{{PresRow|1972|Republican|39,406|25,877|1,100|Virginia}}
{{PresRow|1976|Democratic|30,972|32,536|1,091|Virginia}}
{{PresRow|1980|Republican|30,854|26,502|9,505|Virginia}}
{{PresRow|1984|Democratic|34,848|37,031|363|Virginia}}
{{PresRow|1988|Democratic|34,191|40,314|860|Virginia}}
{{PresRow|1992|Democratic|26,376|47,756|8,452|Virginia}}
{{PresRow|1996|Democratic|26,106|45,573|3,697|Virginia}}
{{PresRow|2000|Democratic|28,555|50,260|4,744|Virginia}}
{{PresRow|2004|Democratic|29,635|63,987|1,028|Virginia}}
{{PresRow|2008|Democratic|29,876|78,994|1,283|Virginia}}
{{PresRow|2012|Democratic|34,474|81,269|1,865|Virginia}}
{{PresRow|2016|Democratic|20,186|92,016|9,137|Virginia}}
{{PresRow|2020|Democratic|22,318|105,344|3,037|Virginia}}
{{PresRow|2024|Democratic|25,223|100,446|3,892|Virginia}}
{{PresFoot}}
Historically a conservative Southern Democratic constituency, Arlington County has been a liberal Democratic stronghold since the 1980s; a Republican candidate has not won Arlington in state or federal elections since 1981.<ref>{{cite news |last1=Blitz |first1=Matt |title=Arlington Hasn’t Always Been Liberal. Just Look at Its Voting History |url=https://www.arlingtonmagazine.com/how-arlington-has-voted-in-presidential-elections/ |access-date=26 July 2025 |work=Arlington Magazine |date=January 19, 2017}}</ref> The Democratic Party has also mostly held Arlington's local elected offices over the last several decades; the election of John Vihstadt, a Republican who ran as an independent, to the county board in November 2014 represented the first non-Democrat to win a county board general election since 1983.<ref>{{cite news |last1=Rothstein |first1=Ethan |title=Vihstadt Victory Could Signal Sea Change in Arlington Politics |url=https://www.arlnow.com/2014/11/05/vihstadt-victory-could-signal-sea-change-in-arlington-politics/ |access-date=27 July 2025 |work=ArlNow |date=November 5, 2014}}</ref> The demographic growth seen in Arlington and the broader Northern Virginia region, which is generally affiliated with the Democratic Party, has shifted Virginia's political orientation; largely as a consequence of its more diverse, urbanized regions, it has voted for the Democratic presidential nominee since 2008.<ref>{{cite news |last1=Tavernise |first1=Sabrina |last2=Gebeloff |first2=Robert |title=How Voters Turned Virginia From Deep Red to Solid Blue |url=https://www.nytimes.com/2019/11/09/us/virginia-elections-democrats-republicans.html |access-date=27 July 2025 |work=The New York Times |date=November 9, 2019}}</ref><ref>{{cite news |last1=Moreno |first1=Sabrina |title=Virginia hasn't gone for a Republican presidential candidate in 20 years |url=https://www.axios.com/local/richmond/2024/09/19/virginia-republican-presidential-candidate-trump-harris |access-date=27 July 2025 |work=Axios |date=September 19, 2024}}</ref>

Issues that have defined Arlington County politics in recent years have focused on how to manage rising costs of living and the county's housing supply, which has brought into debate the future of single-family zoning laws and community density, as well as lack of affordable housing options for residents.<ref name = "Arlington voter guide"/> This has been expressed in the controversy surrounding the county board’s EHO housing policy.<ref name = "Arlington voter guide"/> Also featured in recent elections has been Arlington's elevated office vacancy rates in the post-pandemic era, which have impacted revenue from commercial properties and increased the tax burden of residents for public services.<ref name = "Arlington voter guide"/>

==Education==
===Primary and secondary education===
[[Arlington Public Schools]] operates the county's [[State school#United States|public]] K-12 education system, which includes 22 elementary schools, six middle schools, and three high schools.<ref>{{cite web |title=Schools & Programs |url=https://www.apsva.us/schools-programs/ |website=apsva.us |publisher=Arlington Public Schools |access-date=2 August 2025}}</ref> It also runs two specialized secondary education programs at [[H-B Woodlawn]], which adopts an [[Free school movement|alternative]] education model,<ref>{{cite web |title=History of H-B Woodlawn Secondary Program |url=https://hbwoodlawn.apsva.us/all-about-h-b-woodlawn/history-of-hb/ |website=hbwoodlawn.apsva.us |publisher=Arlington Public Schools |access-date=2 August 2025}}</ref> and Arlington Tech, which provides STEM-focused coursework.<ref>{{cite web |title=About Arlington Tech |url=https://arlingtontech.apsva.us/about-arlington-tech/ |website=arlingtontech.apsva.us |publisher=Arlington Public Schools |access-date=2 August 2025}}</ref> Arlington Public Schools has 3,000 teachers that serve a student body around 28,000 pupils, making it Virginia's 13th largest public school division.<ref>{{cite web |title=About APS |url=https://www.apsva.us/about-aps/ |website=apsva.us |publisher=Arlington Public Schools |access-date=2 August 2025}}</ref> It is governed by a school board composed of five members that are elected in overlapping four-year terms;<ref>{{cite web |title=About the School Board |url=https://www.apsva.us/arlington-school-board/about-the-school-board/ |website=apsva.us |publisher=Arlington Public Schools |access-date=2 August 2025}}</ref> while board members officially run as non-partisan candidates per Virginia law, political parties are able to endorse them.<ref>{{cite news |last1=McCaffrey |first1=Scott |title=School Board candidates back superintendent but say APS can do more |url=https://www.arlnow.com/2025/04/30/school-board-candidates-back-superintendent-but-question-aps-leadership/#:~:text=The%20forum%2C%20moderated%20by%20NAACP,Foster%20nearly%2020%20years%20ago. |access-date=2 August 2025 |work=ArlNow |date=April 30, 2025}}</ref> Arlington also has several [[Private school|private]] and [[Religious school|religious]] schools, including the Catholic [[Bishop O'Connell High School]].<ref>{{cite web |title=About Us |url=https://www.bishopoconnell.org/about |website=bishopoconnell.org |publisher=Bishop O'Connell High School |access-date=2 August 2025}}</ref>

===Colleges and universities===
[[File:MarymountU-5281-012122.jpg|thumb|alt=Aerial view of Marymount University's main campus|An aerial view of the main campus of [[Marymount University]]]]
Many universities, such as [[George Mason University]], [[George Washington University]], [[Georgetown University]], [[Virginia Tech]], the [[University of Virginia]], and [[Northeastern University]], operate [[Satellite campus|satellite campuses]] in Arlington County.<ref>{{cite web |title=Colleges & Universities |url=https://web.arlingtonchamber.org/Government-and-Education/Colleges-Universities |website=web.arlingtonchamber.org |publisher=Arlington Chamber of Commerce |access-date=2 August 2025}}</ref> [[Marymount University]], a private Catholic university established in 1950 by the [[Religious of the Sacred Heart of Mary]],<ref>{{cite web |title=Our History |url=https://marymount.edu/about-mu/our-history/ |website=marymount.edu |publisher=Marymount University |access-date=2 August 2025}}</ref> is the only university with its main campus located in Arlington County.<ref>{{cite web |title=Marymount University |url=https://cicv.org/college/marymount-university/ |website=cicv.org |publisher=Council of Independent Colleges in Virginia |access-date=2 August 2025}}</ref>

==Transportation==
===Roadways===
{{main|Streets and highways of Arlington County, Virginia|Arlington County, Virginia, street-naming system}}
====Arterial roads and highways====
[[File:George Washington Parkway 04 2012 1403.JPG|thumb|alt=George Washington Memorial Parkway along the Potomac River near the Three Sisters|[[George Washington Memorial Parkway]] along the [[Potomac River]] near [[Three Sisters (District of Columbia)|Three Sisters]]]]
Arlington County is traversed by two interstate highways: Interstate 66, which runs between the Theodore Roosevelt Bridge and Falls Church, and Interstate 395, which runs between the 14th Street Bridge and Alexandria. Virginia [[State highway|state highways]] include State Routes [[Virginia State Route 123|123]], [[List of primary state highways in Virginia shorter than one mile#SR 124|124]], [[List of primary state highways in Virginia shorter than one mile#SR 233|233]], [[Virginia State Route 237|237]], and [[Virginia State Route 309|309]]. [[United States Numbered Highway System|U.S. Routes]] [[U.S. Route 1|1]], [[U.S. Route 29|29]], and [[U.S. Route 50|50]] also run through the county. All of these highways are operated and maintained by the [[Virginia Department of Transportation]].<ref>{{cite web |title=Arlington Roads Belonging to State/Federal Government |url=https://www.arlingtonva.us/Government/Programs/Transportation/Streets/State-Roads |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=1 August 2025}}</ref> The [[George Washington Memorial Parkway]], a landscaped [[parkway]] which follows Arlington's Potomac River shoreline, is managed by the [[National Park Service]].<ref>{{cite web |title=Management |url=https://www.nps.gov/gwmp/learn/management/index.htm#:~:text=Today%2C%20George%20Washington%20Memorial%20Parkway,promote%20the%20park's%20intrinsic%20qualities%20. |website=nps.gov |publisher=National Park Service |access-date=1 August 2025}}</ref>

====Streets====
Arlington County's street naming convention, first adopted in 1934 to unify the area's originally unorganized, duplicative street system, uses U.S. Route 50 as the dividing line between northern and southern street designations. Named streets generally run north to south and are ordered alphabetically starting at the Potomac River; this ordering is repeated with additional syllables when the end of the alphabet is reached. Numbered streets run east to west parallel to U.S. Route 50.<ref>{{cite web |title=Streets |url=https://www.arlingtonva.us/Government/Programs/Transportation/Streets |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=1 August 2025}}</ref>

===Public transit===
{{Further|Arlington Transit|Virginia Railway Express|Washington Metro}}
[[File:Ballston–MU (WMATA station) - 02.jpg|thumb|alt=Ballston–MU Metrorail station interior|The interior of [[Ballston–MU station]]]]
Arlington County is served by the WMATA Metrorail and [[Metrobus (Washington, D.C.)|Metrobus]] systems, as well as its local [[Arlington Transit]] (ART) bus service.<ref>{{cite web |title=About |url=https://www.arlingtontransit.com/about/ |website=arlingtontransit.com |publisher=Arlington Rapid Transit |access-date=1 August 2025}}</ref> The Orange and Silver Metrorail lines run through Arlington's Rosslyn-Ballston corridor and Falls Church, while the Blue and Yellow lines are located along the Potomac River and the Richmond Highway corridor. Metrobus and ART service provides connections between Metrorail stations, Arlington's neighborhoods, Fairfax County, Alexandria, and Washington.<ref>{{cite web |title=System Map |url=https://www.wmata.com/schedules/maps/upload/system-map-rail.pdf |website=wmata.com |publisher=Washington Metropolitan Area Transit Authority |access-date=1 August 2025}}</ref><ref>{{cite web |title=Metrobus and Connecting Bus Service in Virginia |url=https://www.wmata.com/initiatives/plans/Better-Bus/upload/Resource_2025-Network_Virginia-Map.pdf |website=wmata.com |publisher=Washington Metropolitan Area Transit Authority |access-date=1 August 2025}}</ref> The [[Virginia Railway Express]], which provides [[commuter rail]] service via the [[Manassas Line|Manassas]] and [[Fredericksburg Line|Fredericksburg Lines]] to locations in Alexandria, [[Fredericksburg, Virginia|Fredericksburg]], and Fairfax, Prince William, Stafford, and [[Spotsylvania County, Virginia|Spotsylvania Counties]], has a station in Arlington in its Crystal City neighborhood.<ref>{{cite web |title=VRE System Map |url=https://www.vre.org/service/system-map/ |website=vre.org |publisher=Virginia Railway Express |access-date=1 August 2025}}</ref>

Along with its neighboring municipalities, Arlington County also co-owns the [[Capital Bikeshare]] [[bicycle-sharing system]], which as of 2021 has over 100 stations located across the county.<ref>{{cite book |last1=DeMaio |first1=Paul |title=Capital Bikeshare Update and New Fee Structure |date=October 28, 2021 |publisher=Arlington County Department of Environmental Services |location=Arlington |page=3 |url=https://www.arlingtonva.us/files/sharedassets/public/v/1/transportation/documents/10-28-21-capital-bikeshare-presentation.pdf}}</ref> The service, which is operated by [[Lyft]],<ref>{{cite web |title=FAQ for Capital Bikeshare Offer |url=https://www.wmata.com/service/bikes/FAQ-for-Capital-Bikeshare-Offer.cfm |website=wmata.com |publisher=Washington Metropolitan Area Transit Authority |access-date=1 August 2025}}</ref> provides traditional [[bicycle|bikes]] and [[Electric bicycle|e-bikes]].<ref>{{cite web |title=Get to know Capital Bikeshare |url=https://capitalbikeshare.com/how-it-works#how-it-works-details |website=capitalbikeshare.com |publisher=Capital Bikeshare |access-date=1 August 2025}}</ref>

===Airport===
{{Main|Ronald Reagan Washington National Airport}}
[[File:RonaldReaganWashingtonNationalAirport.jpg|thumb|alt=Ronald Reagan Washington National Airport terminals and [[Ronald Reagan Washington National Airport station]] |The terminals and [[Ronald Reagan Washington National Airport station|metro station]] at [[Ronald Reagan Washington National Airport]]]]
[[Ronald Reagan Washington National Airport]], Arlington County's only airport, is located near [[Gravelly Point]] on an area of [[Land reclamation|reclaimed land]].<ref>{{cite web |title=History of Reagan National Airport |url=https://www.flyreagan.com/about-airport/history-reagan-national-airport |website=flyreagan.com |publisher=Ronald Reagan Washington National Airport |access-date=1 August 2025}}</ref> The airport's non-stop services are mostly to domestic destinations throughout the United States, and international flights to various locations in [[Canada]], [[Bermuda]], and the [[Caribbean]].<ref>{{cite web |title=Nonstop Destinations |url=https://www.flyreagan.com/nonstop-destinations |website=flyreagan.com |publisher=Ronald Reagan Washington National Airport |access-date=1 August 2025}}</ref> It is accessible via the Blue and Yellow Lines at the [[Ronald Reagan Washington National Airport station]].<ref>{{cite web |title=Directions and Maps |url=https://www.flyreagan.com/directions-maps |website=flyreagan.com |publisher=Ronald Reagan Washington National Airport |access-date=1 August 2025}}</ref>

===Bicycle and pedestrian routes===
[[File:W&OD Trail Glencarlyn Park 1st crossing 2020.jpg|thumb|alt=Bridge over Four Mile Run along W&OD Trail|The bridge over Four Mile Run along the trail of [[Washington and Old Dominion Railroad Regional Park]]]]
Arlington County has a network of bike and pedestrian-friendly infrastructure;<ref>{{cite web |title=BikeArlington |url=https://www.arlingtonva.us/Government/Projects/Programs/BikeArlington |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=1 August 2025}}</ref> Arlington operates around 49 miles of paved trails for hikers and bikers. Major [[Shared-use path|shared-use paths]] include the [[Washington and Old Dominion Railroad Regional Park|W&OD]], [[Custis Trail|Custis]], [[Four Mile Run Trail|Four Mile Run]], and [[Mount Vernon Trail|Mount Vernon Trails]].<ref name = "Trails">{{cite web |title=Trails |url=https://www.arlingtonva.us/Government/Departments/Parks-Recreation/Locations/Off-street-trails |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=1 August 2025}}</ref> Arlington has continued to make improvements to its bike infrastructure in recent years, which includes protected bike lanes and trails, and was recognized by the [[League of American Bicyclists]] in 2024 as being a Gold-level community for bicycle-friendliness.<ref>{{cite web |title=Arlington Spins Gold as a Bicycle Friendly Community |url=https://www.arlingtonva.us/About-Arlington/Newsroom/Articles/2024/Arlington-Spins-Gold-as-a-Bicycle-Friendly-Community |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=1 August 2025}}</ref>

==Parks and recreation==
{{Further|NOVA Parks}}
Arlington County maintains 164 parks, 13 community centers, and over 100 sports facilities. The 100-acre Glencarlyn Park, one of Arlington's largest parks, is located along Four Mile Run and has nature trails, playgrounds, and a nature center with exhibits on Arlington's local ecosystem.<ref>{{cite web |title=Glencarlyn Park |url=https://www.arlingtonva.us/Government/Departments/Parks-Recreation/Locations/Parks/Glencarlyn-Park |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=2 August 2025}}</ref><ref>{{cite web |title=Long Branch Nature Center at Glencarlyn Park |url=https://www.arlingtonva.us/Government/Departments/Parks-Recreation/Locations/Nature-Centers/Long-Branch-Nature-Center |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=2 August 2025}}</ref> The Long Bridge Aquatic and Fitness Center, a 92,000 square foot indoor aquatic and recreation facility completed in 2021,<ref>{{cite web |title=Long Bridge Aquatics and Fitness Center Opens August 23 |url=https://www.arlingtonva.us/About-Arlington/Newsroom/Articles/2021/Long-Bridge-Aquatics-and-Fitness-Center-Opens-August-23 |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=3 August 2025}}</ref> has Arlington's only 50-meter competition pool, a gym, and venues for community meetings.<ref>{{cite web |title=Long Bridge Amenities |url=https://www.arlingtonva.us/Government/Departments/Parks-Recreation/Locations/Indoor-Facilities/Long-Bridge-Aquatics-Fitness-Center/Amenities |website=arlingtonva.us |publisher=County of Arlington, Virginia |access-date=3 August 2025}}</ref> [[National Park Service]] manages the Mount Vernon Trail, which is part of the larger [[Potomac Heritage Trail]], and [[NOVA Parks]] operates the W&OD trail.<ref name = "Trails"/><ref>{{cite web |title=Maps - NPS Potomac Heritage National Scenic Trail Map |url=https://www.nps.gov/pohe/planyourvisit/maps.htm |website=nps.gov |publisher=National Park Service |access-date=18 September 2025}}</ref>

==Sister cities==
Arlington Sister City Association (ASCA) is a nonprofit organization affiliated with Arlington County, Virginia. ASCA works to enhance and promote the region's international profile and foster productive exchanges in education, commerce, culture and the arts through a series of activities. Established in 1993, ASCA supports and coordinates the activities of Arlington County's five [[sister cities]]:<ref>{{cite web|title=Sister Cities|url=http://arlingtonsistercities.org/sister-cities/|publisher=Arlington Sister City Association|access-date=October 31, 2020|archive-date=October 29, 2017|archive-url=https://web.archive.org/web/20171029155501/http://arlingtonsistercities.org/sister-cities/|url-status=dead}}</ref>
{{div col|colwidth=20em}}
*{{flagicon|GER}} [[Aachen]], Germany
*{{flagicon|MEX}} [[Coyoacán|Coyoacán (Mexico City)]], Mexico
*{{flagicon|UKR}} [[Ivano-Frankivsk]], Ukraine
*{{flagicon|FRA}} [[Reims]], France
*{{flagicon|SLV}} [[San Miguel, El Salvador|San Miguel]], El Salvador
{{div col end}}

==Notable people==
{{main|List of people from Arlington, Virginia}}

==See also==
{{Portal|Virginia}}
* [[Northern Virginia]]
* [[Arlington National Cemetery]]
* [[The Pentagon]]

==Notes==
{{notelist}}

==References==
{{Reflist|30em}}

==Bibliography==
{{Refbegin|30em}}
* {{cite book |last1=Arlington County Department of Community Planning, Housing, and Development |title=Profile 2025 |date=2025 |publisher=County of Arlington, Virginia |url=https://www.arlingtonva.us/files/sharedassets/public/v/1/projects/documents/data-and-research/profile/profile_report_2025_final_4_2_25.pdf |access-date=29 July 2025}}
* {{cite book |last1=Bestebreurtje |first1=Lindsey |title=Built by the People Themselves: African American Community Development in Arlington, Virginia, from the Civil War through Civil Rights |date=2024 |publisher=The University of South Carolina Press |location=Columbia |isbn=978-1-64336-498-8 |pages=}}
* {{cite journal |last1=Clark |first1=Charles S. |title=George Washington Parke Custis: Retrocession and the Disputed Role of Slavery |journal=Arlington Historical Magazine |date=2022 |volume=17 |issue=2 |pages=31-43 |url=https://arlhist.org/wp-content/uploads/2024/10/AHS-2022-George-Washington-Parke-Custis.pdf |access-date=14 July 2025}}
* {{cite journal |last1=Deines |first1=Ann |title=A Survey of the Development of Arlington County, Virginia, 1940 - 1965 |journal=Arlington Historical Magazine |date=October 1995 |volume=10 |issue=3 |page= |url=https://arlhist.org/wp-content/uploads/2020/02/1995-6-Survey.pdf}}
* {{cite web |last1=Frost |first1=William |last2=Ernest |first2=Timothy |title=Simplified Geologic Map of Arlington County, Virginia, and Vicinity |url=https://arlgis.arlingtonva.us/web_files/Maps/Standard_Maps/Geology.pdf |website=arlgis.arlingtonva.us |publisher=Arlington County Department of Public Works GIS Mapping Center |year=1999|access-date=22 July 2025}}
* {{cite book |last1=Goodall |first1=Jonathan L. |last2=Elias |first2=Antonio |last3=Andrews |first3=Elizabeth |last4=Chope |first4=Christopher |last5=Cosgrove |first5=John |last6=El Koubi |first6=Jason |last7=Irish |first7=Jennifer |last8=Lawrence |first8=Lewis L. III |last9=Lazaro |first9=Robert W. Jr. |last10=Leighty |first10=William H. |last11=Luckenbach |first11=Mark W. |last12=Miller-Hooks |first12=Elise |last13=Phillips |first13=Ann C. |last14=Pollard |first14=Henry V. |last15=Steinhilber |first15=Emily |last16=Feigenoff |first16=Charles |last17=Sayegh |first17=Jennifer |title=The Impact of Climate Change on Virginia's Coastal Areas |date=June 2021 |publisher=Virginia Academy of Science, Engineering, and Medicine Faulty Publications |url=https://scholarship.law.wm.edu/cgi/viewcontent.cgi?article=3083&context=facpubs |access-date=22 July 2025}}
* {{cite book |last1=Hanna |first1=Jennifer |title=Arlington House, The Robert E. Lee Memorial: Cultural Landscapes Report, History, Volume 1 |date=October 2001 |publisher=US Department of the Interior |location=Washington, D.C. |url=https://www.nps.gov/parkhistory/online_books/arho/clr.pdf |access-date=16 July 2025}}
* {{cite journal |last1=Kaplan |first1=Jessica |last2=Good |first2=Cassandra A. |last3=Kerr |first3=Molly |title=Memorializing the Enslaved in Arlington, Virginia, 1669-1865 |journal=Journal of Slavery and Data Preservation |date=April 2025 |volume=6 |issue=1 |pages=45-53 |url=https://doi.org/10.14321/jsdp.6.1.0045 |access-date=14 July 2025}}
* {{cite book |last1=Liebertz |first1=John |title=A Guide to the African American Heritage of Arlington, Virginia |date=2016 |publisher=Arlington County Department of Community Planning, Housing and Development, Historic Preservation Program |url=https://www.arlingtonva.us/files/content/public/government/departments/parks-recreation/parks-events/black-history-mystery/a-guide-to-the-african-american-heritage-of-arlington-county-virginia.pdf |access-date=30 June 2025}}
* {{cite book |last1=O'Connell |first1=Kim |title=Echos of Little Saigon |date=2016 |publisher=Virginia Foundation for the Humanities |page= |url=https://virginiahumanities.org/wp-content/uploads/2016/09/Echoes-of-Little-Saigon.pdf |access-date=20 July 2025}}
* {{cite journal |last1=Perry |first1=Nancy |title=How Eminent Domain Destroyed an Arlington Community |journal=Arlington Historical Magazine |date=2017 |volume=16 |issue=1 |pages=6–17 |url=https://arlhist.org/wp-content/uploads/2020/02/2017-2-Eminent.pdf |access-date=1 July 2025}}
* {{cite journal |last1=Richards |first1=David Mark |title=The Debates over the Retrocession of the District of Columbia, 1801–2004 |journal=Washington History |date=2004 |volume=16 |issue=1 |pages=54-82 |url=https://www.jstor.org/stable/40073581 |access-date=14 July 2025}}
* {{cite book |last1=Rose Jr. |first1=C. B. |title=Arlington County, Virginia: A History |date=1976 |publisher=Port City Press |location=Baltimore |url=https://arlhist.org/product/book-arlington-county-virginia-a-history/}}
* {{cite journal |last1=Rose Jr. |first1=C. B. |title=Civil War Forts in Arlington |journal=Arlington Historical Magazine |date=October 1960 |volume=1 |issue=4 |pages=14-27 |url=https://arlhist.org/wp-content/uploads/2020/04/1960-3-Civil-War.pdf |access-date=15 July 2025}}
* {{cite journal |last1=Schildt |first1=Bobbi |title=Aladdin's Lamp: Education in Freedman's Village |journal=Arlington Historical Magazine |date=October 1995 |volume=10 |issue=3 |pages=7-18 |url=https://arlhist.org/wp-content/uploads/2020/02/1995-2-Alladin.pdf |access-date=18 July 2025}}
* {{cite book |last1=Skolnik |first1=Benjamin A. |title=Building and Property History: 1315 Duke Street, Alexandria, Virginia |date=January 2021 |publisher=City of Alexandria, Virginia Office of Historic Alexandria |location=Alexandria |url=https://media.alexandriava.gov/docs-archives/historic/info/archaeology/1315dukestbuildinghistoryskolnik2021.pdf |access-date=28 July 2025}}
* {{cite book |last1=Tourism Economics |title=Arlington, Virginia Visitor Economy |date=June 2024 |publisher=Arlington Convention and Visitor Service |location=Arlington, Virginia |url=https://stay-arlington-2023.s3.amazonaws.com/images/files/Tourism-Economics-Study-Arlington-Virginia-Visitor-Economy-2023-FINAL.pdf?v=1719510320 |access-date=29 July 2025}}
* {{cite journal |last1=Williams |first1=Brett |title=A River Runs Through Us |journal=American Anthropologist |date=June 2001 |volume=103 |issue=2 |pages=409-431 |url=https://www.jstor.org/stable/683474 |access-date=13 July 2025}}
* {{cite book |last1=Zell |first1=Greg |title=Wildlife of Arlington: A Natural Heritage Resource Inventory Technical Report |date=July 2011 |publisher=Arlington County Department of Parks, Recreation, and Cultural Resources |location=Arlington, Virginia |url=https://arlingtonva.s3.amazonaws.com/wp-content/uploads/sites/13/2020/12/WILDLIFE-OF-ARLINGTON-A-NHRI-Technical-Report.pdf |access-date=23 July 2025}}
{{Refend}}

==External links==
{{commons category}}
{{wikivoyage|Arlington (Virginia)}}
===Government===
* [https://www.arlingtonva.us County Government website]
* [https://www.apsva.us/ Arlington Public Schools website]
* [https://www.arlingtoneconomicdevelopment.com/Home Arlington Economic Development website]

===Tourism and recreation===
* [https://www.stayarlington.com/ Arlington Tourism website]
* [https://www.arlingtonva.us/Government/Departments/Parks-Recreation Parks & Recreation website]

===Culture and history===
* [https://library.arlingtonva.us/ Arlington Public Library]
* [https://libraryarchives.arlingtonva.us/index.php Charlie Clark Center for Local History Digital Collections]
* [http://www.arlingtonhistoricalsociety.org/ Arlington Historical Society website]
* [https://arlingtonblackheritage.org Black Heritage Museum of Arlington website]

===Maps and demographics===
* [https://data.census.gov/profile/Arlington_County,_Virginia?g=050XX00US51013 Arlington County U.S. Census Bureau Profile]
* [https://www.arlingtonva.us/Government/Programs/Maps Arlington County GIS Mapping Center website]

{{Geographic Location
|Centre    = Arlington County, Virginia
|North     = [[Washington, D.C.]]
|Northeast =
|East      = [[Washington, D.C.]]
|Southeast =
|South     = [[Alexandria, Virginia|City of Alexandria]]
|Southwest = [[Falls Church, Virginia|City of Falls Church]]
|West      = [[Fairfax County, Virginia|Fairfax County]]
|Northwest = [[Fairfax County, Virginia|Fairfax County]]
}}
{{Arlington County, Virginia|state=collapsed}}
{{Virginia|state=collapsed}}
{{Virginia county seats and independent cities}}
{{Northeast Megalopolis}}
{{DCMetroArea|state=collapsed}}
{{District of Columbia|state=collapsed}}
{{Authority control}}

[[Category:Arlington County, Virginia| ]]
[[Category:1801 establishments in Virginia]]
[[Category:History of the District of Columbia]]
[[Category:Northern Virginia counties]]
[[Category:Populated places established in 1801]]
[[Category:Virginia counties]]
[[Category:Virginia counties on the Potomac River]]
[[Category:Washington metropolitan area]]