Hickory Ridge is an extinct unincorporated town in Prince William County, Virginia. The town was located on land that is now part of Prince Willi…Hickory Ridge is an extinct unincorporated town in Prince William County, Virginia. The town was located on land that is now part of Prince William Forest Park, a National Park Service property located adjacent to Marine Corps Base Quantico. The town was established shortly after the opening of the now defunct Cabin Branch Pyrite Mine in 1889 and was home to many of the mine employees.