Aspen Hill, Maryland, United States [CDP]; population was 45,494 in 1990; housing units was 17,157 in 1990; location is 39°6'N 77°5'W; land area is 10.46 square miles (6,697 acres); water area is 0.06 square miles (38 acres); FIPS code is 2825 [SourceCBP]