 Known locally as "Old Greenbelt", the original, federally-built core of the city was recognized as the Greenbelt Historic District by the Maryland Historical Trust, and is listed on the National Register of Historic Places as a National Historic Landmark District.Greenbelt's population, which includes residents of private sector dwellings that were constructed over several decades subsequent to the federal government's ownership of the city, was recorded as in the 2010 U.S. Census.Greenbelt is located at .