Preston, MD -- U.S. town in Maryland Population (2000): 566 Housing Units (2000): 242 Land area (2000): 0.560863 sq. miles (1.452629 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.560863 sq. miles (1.452629 sq. km) FIPS code: 63825 Located within: Maryland (MD), FIPS 24 Location: 38.710883 N, 75.908297 W ZIP Codes (1990): 21655 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Preston, MD Preston