1 definition found wellesley - U.S. Gazetteer (1990) : Wellesley, MA (CDP, FIPS 74210) Location: 42.30445 N, 71.28680 W Population (1990): 26615 (8764 housing units) Area: 26.4 sq km (land), 0.8 sq km (water) Zip code(s): 02181