Diamond, MO -- U.S. town in Missouri Population (2000): 807 Housing Units (2000): 350 Land area (2000): 0.664080 sq. miles (1.719958 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.664080 sq. miles (1.719958 sq. km) FIPS code: 19432 Located within: Missouri (MO), FIPS 29 Location: 36.994573 N, 94.313826 W ZIP Codes (1990): 64840 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Diamond, MO Diamond