Loudoun County, Virginia is located in the Loudoun Health District. It has 515.7 square miles of land area and is the 20th largest county in Virginia by total area. It is bordered by Fauquier, Fairfax, Clarke, and Prince William County in Virginia, Jefferson County, West Virginia, and Frederick, Washington and Montgomery County, Maryland. There are 74 census tracts in the county. The county FIPS number is 51107.

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