Calhoun, MO -- U.S. city in Missouri Population (2000): 491 Housing Units (2000): 211 Land area (2000): 0.988832 sq. miles (2.561064 sq. km) Water area (2000): 0.009324 sq. miles (0.024150 sq. km) Total area (2000): 0.998156 sq. miles (2.585214 sq. km) FIPS code: 10450 Located within: Missouri (MO), FIPS 29 Location: 38.467985 N, 93.625817 W ZIP Codes (1990): 65323 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Calhoun, MO Calhoun