Manassas Park is a city in Virginia. It is an independent city and not part of any county. Manassas Park is bordered by the city of Manassas and Prince William County. The Bureau of Economic Analysis combines the city of Manassas Park (along with City of Manassas) with Prince William County for statistical purposes. The population was 14,273 in 2010. This city is a part of the Washington Metropolitan Area. Manassas Park was incorporated as a town in 1957 and was incorporated as a city in 1975.