Gilliam, MO -- U.S. town in Missouri Population (2000): 229 Housing Units (2000): 118 Land area (2000): 0.250267 sq. miles (0.648188 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.250267 sq. miles (0.648188 sq. km) FIPS code: 27028 Located within: Missouri (MO), FIPS 29 Location: 39.233168 N, 93.003890 W ZIP Codes (1990): 65330 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Gilliam, MO Gilliam