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is a census-designated place (CDP) in Prince William County, Virginia, United States. The population was 40,561 at the July 2007 census. It is the home of the Northern Virginia Royals soccer club and the Potomac Nationals baseball club.
According to the United States Census Bureau, the CDP has a total area of 10.8 square miles (27.9 km²), of which, 10.5 square miles (27.1 km²) of it is land and 0.3 square miles (0.8 km²) of it (2.87%) is water.