Fairfax County, officially the County of Fairfax, is a county in the Commonwealth of Virginia. It is part of Northern Virginia and borders both the city of Alexandria and Arlington County and forms part of the suburban ring of Washington, D.C., the nation's capital. The county is predominantly suburban in character with some urban and rural pockets. As of the 2020 census, the population was 1,150,309, making it the most populous jurisdiction in Virginia, with around 13% of the state's population, the most populous jurisdiction in the Washington metropolitan area, with around 20% of the MSA population, and the most populous location in the Washington–Baltimore combined statistical area, with around 13% of the CSA population. The county seat is Fairfax; however, because it is an independent city under Virginia law, the city of Fairfax is not part of the county.

Founded: June 19, 1742
Named for: Thomas Fairfax, 6th Lord Fairfax of Cameron
Seat: Fairfax (independent city) 1
Largest town: Herndon
Total: 406 sq mi (1,051.54 km²)
Land: 391.02 sq mi (1,012.74 km²)
Water: 15.47 sq mi (40.07 km²), 3.8
ZIP code(s): 20120, 20121, 20122, 20124, 20151, 20152, 20153, 20164, 20166, 20170, 20171, 20172, 20190, 20191, 20192, 20194, 20195, 20196, 22003, 22009, 22015, 22018, 22019, 22027, 22030, 22031, 22032, 22033, 22035, 22037, 22038, 22039, 22041, 22042, 22043, 22044, 22046, 22060, 22066, 22067, 22079, 22081, 22082, 22101, 22102, 22106, 22116, 22121, 22124, 22150, 22151, 22152, 22153, 22158, 22159, 22160, 22161, 22180, 22181, 22182, 22183, 22185, 22199, 22203, 22204, 22205, 22206, 22207, 22213, 22302, 22303, 22304, 22306, 22307, 22308, 22309, 22310, 22311, 22312, 22315
Area code(s): 703, 571
Time zone: Eastern: UTC-5-4
Twitter profile: fairfaxcounty
Official Website: https://www.fairfaxcounty.gov/
Wikidata description: county in Virginia, United States
Wikidata id: Q341915
Wikidata label: Fairfax County
Wikidata aliases: Array
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