The Riverdale Park Historic District is a national historic district located at Riverdale Park, Prince George's County, Maryland. The community developed starting in 1889, around the B & O passenger railroad station, as an early railroad suburb northeast of Washington, D.C. Later, 20th century additions expanded the community. One of the more imposing features of the community is the early-19th-century mansion known as Riversdale. In general residential styles range from large  2 1⁄2-story wood-frame dwellings to smaller bungalows, with an eclectic collection of imposing Queen Anne and Colonial Revival houses.