1 definition found kewanee - U.S. Gazetteer (1990) : Kewanee, IL (city, FIPS 39727) Location: 41.24114 N, 89.92557 W Population (1990): 12969 (5875 housing units) Area: 15.0 sq km (land), 0.0 sq km (water) Zip code(s): 61443