County Maps US

Arlington County, Virginia

A county in Virginia, ranked 8 of 133 by population.

CountyFIPS 51013

Within Virginia
Arlington County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Arlington, the county seat, located via the 2025 Census Gazetteer.

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Population
243,931
+5,106 (+2.1%) since 2020
Land area
26.0
square miles. A further 0.4% of the total area is water
Population density
9,383
people per square mile, computed rather than published
County seat
Arlington
Arlington is an unincorporated area coextensive with the county.
Established
1801
224 years ago
Largest city
Not available
No incorporated place lies within this county.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Arlington County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Arlington County, Virginia from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 784 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Arlington County ranks

Position among the 133 counties and independent cities of Virginia, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn VirginiaNationally
Population243,9318th of 133300th of 3,144
Land area26.0 sq mi106th of 1333,114th of 3,144
Population density9,383 per sq mi2nd of 13311th of 3,144
Median household income$142,1144th of 13312th of 3,143

Full data for Arlington County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population243,931Vintage 2025 Population Estimates
Population in 2020238,825Vintage 2025 Population Estimates
2020 estimates base?238,647Vintage 2025 Population Estimates
Land area26.0 sq mi2025 Gazetteer Files
Water area0.11 sq mi2025 Gazetteer Files
Total area26.1 sq mi2025 Gazetteer Files
Population density?9,383 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$142,114American Community Survey 2020-2024 5-Year Estimates
Median home value$895,000American Community Survey 2020-2024 5-Year Estimates
Median age35.5American Community Survey 2020-2024 5-Year Estimates
Households112,027American Community Survey 2020-2024 5-Year Estimates
Housing units121,970American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+1,415
2,451 births, 1,036 deaths
Net migration
+2,810
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 5 areas bordering Arlington County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
District of ColumbiaDistrict of Columbia11 mi693,645
Fairfax CountyVirginia7.1 mi1,167,873
Alexandria cityVirginia5.3 mi160,662
Falls Church cityVirginia1.7 mi15,159
Montgomery CountyMaryland13 ft1,074,582

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 133 counties and independent cities of Virginia

Open the interactive Virginia county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.