Fairfax County, Virginia

County seat: Fairfax · Population 1.2 million (2025) · 391 sq mi

Fairfax County is the most populous of Virginia's 133 counties, with 1,167,873 people (2025 estimate). Its county seat is Fairfax. It is part of the Northern Virginia Regional Commission (PD 8) region, one of the 21 Planning District Commissions of Virginia. The map shows its 3 cities and towns and the 9 neighboring counties.

Map of Fairfax County, Virginia with cities, towns and the county boundary
Fairfax County, Virginia with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
Download PDF (Letter) 304 KBPNG image 203 KBVirginia county map

Fairfax County facts

County seat
Fairfax
Population (2025 estimate)
1,167,873 +1.5% since 2020
Land area
391 sq mi 47th largest of 133
Water area
15 sq mi
Population density
2,987 per sq mi
Established
1742
Named after
Thomas Fairfax American planter
Largest city
Centreville 71,706
Median household income
$153,637
Cities and towns
3 plus 66 CDPs
ZIP codes
49
Time zone
Eastern
FIPS code
51059

Cities and towns in Fairfax County

Fairfax County has 3 incorporated cities, towns and villages. Populations count the people living inside Fairfax County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
HerndonTown25,506Loudoun County
ViennaTown16,691
CliftonTown241

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
Centreville71,706
Reston64,414
McLean49,627
Burke44,029
Annandale41,705
Oakton36,528
Fair Oaks35,545
West Falls Church31,279
Springfield31,154
Tysons28,936
Bailey's Crossroads24,271
Chantilly24,036
McNair22,655
West Springfield22,532
Woodlawn21,194
Rose Hill21,066
Lorton20,991
Merrifield20,698
Lincolnia20,320
Franklin Farm18,736
Kingstowne18,360
Franconia18,335
Idylwood17,559
Hybla Valley17,257
Burke Centre17,037
Fort Hunt16,700
Wolf Trap15,858
Great Falls15,228
Groveton13,931
Huntington13,502
Newington13,478
Kings Park West13,442
Mount Vernon13,122
Fairfax Station12,566
Newington Forest12,316
Wakefield11,930
Dranesville11,828
Lake Barcroft10,973
Difficult Run9,938
George Mason9,937
Woodburn9,503
Seven Corners9,371
Dunn Loring8,957
Fair Lakes8,894
Fort Belvoir8,449
Mantua8,298
Greenbriar8,243
Bull Run7,823
Floris7,589
Laurel Hill7,450
Hutchison7,284
North Springfield7,050
Long Branch7,034
South Run6,600
Pimmit Hills6,589
Belle Haven6,570
Braddock6,536
Crosspointe5,669
Union Mill4,484
Hayfield4,392
Kings Park4,315
Navy3,839
Ravensworth2,475
Sully Square2,394
Mason Neck2,039
Great Falls Crossing1,414

ZIP codes in Fairfax County

49 ZIP codes reach into Fairfax County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Fairfax County, 2020–2025

Fairfax County grew by 17,579 people (+1.5%) between April 2020 and July 2025: 33,045 more births than deaths and a net loss of 16,120 people from migration.

Year (July 1)Population
20201,148,598
20211,142,546
20221,138,853
20231,143,456
20241,159,806
20251,167,873

Neighboring counties

Printable Fairfax County map

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Sources

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