Houstonia, MO -- U.S. city in Missouri Population (2000): 275 Housing Units (2000): 105 Land area (2000): 0.197025 sq. miles (0.510292 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.197025 sq. miles (0.510292 sq. km) FIPS code: 33256 Located within: Missouri (MO), FIPS 29 Location: 38.898487 N, 93.358869 W ZIP Codes (1990): 65333 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Houstonia, MO Houstonia