Riverdale Park or Riverdale is a semi-urban town located in the U.S. state of Maryland. It is within Prince George's County in the Washington-Arlington-Alexandria Metro Area. It has a total area of 1.68 square miles at 38°57′46″N 76°55′47″W. The elevation is 39 feet above sea level. Riverdale was incorporated in 1920. As of the 2010 census data, it had a total population of 6,956. The population density was 4,100/sq mi. Estimated per capita income in 2016 was $24,359. Recent job growth is positively increased by 1.62 percent. The average travel time is 31 minutes.