Kewanee, IL -- U.S. city in Illinois Population (2000): 12944 Housing Units (2000): 5879 Land area (2000): 6.276996 sq. miles (16.257345 sq. km) Water area (2000): 0.012941 sq. miles (0.033516 sq. km) Total area (2000): 6.289937 sq. miles (16.290861 sq. km) FIPS code: 39727 Located within: Illinois (IL), FIPS 17 Location: 41.241180 N, 89.925680 W ZIP Codes (1990): 61443 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Kewanee, IL Kewanee