County Center is a census-designated place in Prince William County, Virginia, United States. The population as of the 2010 Census was 3,270. In 2021, the United States Census Bureau estimated it to be 4,045. It is notable for including the county's McCoart Government Center off Prince William Parkway, along with adjoining Pfitzner Stadium, former home field of the Potomac Nationals, now the Fredericksburg Nationals.