Friendly is an unincorporated area and census-designated place in Prince George's County, Maryland, United States, with an African-American majority population, located a few miles south of Washington, D.C. The population was 9,937 at the 2020 census. Friendly had its own rural post office in the early 20th century, and is now under the mailing address Fort Washington. The name "Friendly" is most associated with Friendly High School, which serves most of the greater Fort Washington area.