Knox City, MO -- U.S. city in Missouri Population (2000): 223 Housing Units (2000): 137 Land area (2000): 0.209873 sq. miles (0.543568 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.209873 sq. miles (0.543568 sq. km) FIPS code: 39278 Located within: Missouri (MO), FIPS 29 Location: 40.144674 N, 92.010466 W ZIP Codes (1990): 63446 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Knox City, MO Knox City