Langdon, is a neighborhood located in Ward 5 of Northeast Washington, D.C. Historical surveys of D.C. recognize Langdon as a neighborhood dating back to at least 1903. Langdon is bounded by Montana Ave. NE to the west/southwest, New York Ave. NE to the south, Bladensburg Rd. NE to the southeast, South Dakota Ave. NE to the northeast, and Rhode Island Ave. NE to the north/northwest.