Accokeek, Maryland, United States [CDP]; population was 4,477 in 1990; housing units was 1,585 in 1990; location is 38°41'N 77°1'W; land area is 22.40 square miles (14,339 acres); water area is 1.01 square miles (646 acres); FIPS code is 250 [SourceCBP]