Beltsville's an unincorporated area and census-designated place (CDP) in northern Prince George's County, Maryland, United States. The population was 15,691 at the 2000 census. The Beltsville CDP includes the unincorporated community of Vansville. Geography Beltsville's located at (39.037509, -76.917847), adjacent to the Montgomery County-Prince George's County line. According to the United States Census Bureau, Beltsville has a total area of 6.6 square miles (17.2 km²), all of it land. De… (More on Beltsville)