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Prince William County lies beside the Potomac River in the U.S. state of Virginia. At the 2020 census, the population was 482,204 making it Virginia's second most populous county. The county seat is the independent city of Manassas.

A part of Northern Virginia, Prince William County is part of the Washington metropolitan area. In 2020, it had the 24th highest income of any county in the United States.

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