Map of Mary Bird Branch Trail, Prince William County, Virginia LOCATION Latitude: 38.58611 Longitude: -77.36889 Current weather conditions and forecast for Mary Bird Branch Trail, Prince William County, Virginia Local climate location: WASH DULLES WSO AP 6 miles away    High quality water resistant topo map of Mary Bird Branch Trail, Prince William County, Virginia.   Virginia Hiking Trails Complete list of all hiking trails in Virginia sorted by county. Books about Mary Bird Branch Trail, Prince William County, Virginia List of books available on Amazon.com about Mary Bird Branch Trail. Outdoors Recreation Near Washington-Arlington-Alexandria, DC-Virginia-Maryland-West Virginia Outdoors recreation in the vicinity of Washington-Arlington-Alexandria, DC-Virginia-Maryland-West Virginia, the metro area neareast to Mary Bird Branch Trail. Find info on campgrounds, marinas, hiking trails, ski resorts, lakes, beaches, parks, whitewater, golf courses and more. Virginia Outdoors Index Index of outdoors activities in the great state of Virginia.