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Answer» What is Prince William County mean? Prince William County is located on the Potomac River in the U.S. state of Virginia. As of the 2010 census, the population was 402,002, on July 1, 2019, the population was estimated to be 470,335, 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 metropolitan area. In 2019 it had the 20th-highest income of any county in the United States. reference
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