There are 18 US Post Offices in Fauquier County serving a total of 63,258 residents equating to 3,514 residents per post office. It's estimated that approximately 100,967 packages are handled across the 18 county post offices annually. Fauquier /f\u0254\u02d0\u02c8k\u026a\u0259r/ is a county located in the Commonwealth of Virginia. As of the 2010 census, the population was 65,203. The county seat is Warrenton. Fauquier County is part of the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area. The county is located in Northern Virginia. In 2011, Fauquier County was number eight on the U.S. Census Bureau list of highest-income counties in the United States."