Martinsburg, MO -- U.S. town in Missouri Population (2000): 326 Housing Units (2000): 148 Land area (2000): 0.259693 sq. miles (0.672601 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.259693 sq. miles (0.672601 sq. km) FIPS code: 46460 Located within: Missouri (MO), FIPS 29 Location: 39.101182 N, 91.647355 W ZIP Codes (1990): 65264 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Martinsburg, MO Martinsburg