The overall value of land for sale in Prince William County recently on Land.com was approximately $329 million. This represents almost 1,000 acres of farms, hunting land and other rural land and acreage for sale in Prince William County. Prince William County ranks 27th out of 133 counties in the Old Dominion for the combined amount of land currently advertised for sale. Of all locations in Prince William County with land and rural real estate for sale, Manassas featured the most land for sale. Prince William County is Virginia's 60th largest county (347 square miles). It's located in the Northern Virginia region of Virginia.