Charlestown, MD -- U.S. town in Maryland Population (2000): 1019 Housing Units (2000): 451 Land area (2000): 0.905974 sq. miles (2.346463 sq. km) Water area (2000): 0.320460 sq. miles (0.829987 sq. km) Total area (2000): 1.226434 sq. miles (3.176450 sq. km) FIPS code: 15400 Located within: Maryland (MD), FIPS 24 Location: 39.576617 N, 75.977888 W ZIP Codes (1990): 21914 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Charlestown, MD Charlestown