1 definition found cahokia - U.S. Gazetteer (1990) : Cahokia, IL (village, FIPS 10370) Location: 38.56476 N, 90.17759 W Population (1990): 17550 (6411 housing units) Area: 25.0 sq km (land), 1.0 sq km (water) Zip code(s): 62206