1 definition found wauseon - U.S. Gazetteer (1990) : Wauseon, OH (city, FIPS 81928) Location: 41.55352 N, 84.14194 W Population (1990): 6322 (2410 housing units) Area: 11.7 sq km (land), 0.0 sq km (water) Zip code(s): 43567