This county is located in Northern Virginia and is part of the Washington, D.C., metropolitan area. The Potomac River marks the eastern border of the county, while the western half of the county is largely rural and expands all the way to Bull Run Mountain.
Loudon and Fairfax Counties are located to the north of Prince William County and contain many densely packed suburbs. Stafford and Fauquier Counties are located to the south and are more rural. Prince William County balances the suburban and rural natures of the counties that surround it.