<page_title> Prince William County, Virginia </page_title> <section_title> Geography </section_title> <table> <cell> Prince William County <col_header> Name </col_header> </cell> <cell> 402,002 <col_header> Population 2010 Census </col_header> </cell> <cell> 451,721 <col_header> Population July 1, 2015 Estimate </col_header> </cell> </table>
As of the 2010 census, the population of Prince William County's was 402,002 and on July 1, 2015, the population was estimated to be 451,721.