Prince William County is a county on the Potomac River in the Commonwealth of Virginia in the United States. As of the 2010 census, the population was 402,002, on 1 July 2015, the population was estimated to be 451,721,making it Virginia’s second-most populous county. Its county seat is the independent city of Manassas.
A part of Northern Virginia, Prince William County is part of the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area. In 2012 it had the seventh highest income of any county in the United States.
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