Fairfax County, Virginia is located in the Fairfax Health District. It has 391.0 square miles of land area and is the 6th largest county in Virginia by total area. It is bordered by Alexandria city, Falls Church city, Fairfax city, Loudoun, Prince William, and Arlington Counties, Virginia, and Charles, Prince George’s, and Montgomery Counties, Maryland, and the District of Columbia. There are 272 census tracts in the county. The county FIPS number is 51059.

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