Warrensburg, IL -- U.S. village in Illinois Population (2000): 1289 Housing Units (2000): 527 Land area (2000): 0.678211 sq. miles (1.756559 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.678211 sq. miles (1.756559 sq. km) FIPS code: 78916 Located within: Illinois (IL), FIPS 17 Location: 39.931102 N, 89.061326 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Warrensburg, IL Warrensburg