Map of White Horse Trail, District of Columbia County, District of Columbia LOCATION Latitude: 38.97333 Longitude: -77.04111 Current weather conditions at White Horse Trail, District of Columbia County, District of Columbia Local climate location: ROCKVILLE 4 miles away    High quality water resistant topo map of White Horse Trail, District of Columbia County, District of Columbia.   District of Columbia Hiking Trails Complete list of all hiking trails in District of Columbia sorted by county. Books about White Horse Trail, District of Columbia County, District of Columbia List of books available on Amazon.com about White Horse 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 White Horse Trail. Find info on campgrounds, marinas, hiking trails, ski resorts, lakes, beaches, parks, whitewater, golf courses and more. District of Columbia Outdoors Index Index of outdoors activities in the great state of District of Columbia.