1 definition found exton - U.S. Gazetteer (1990) : Exton, PA (CDP, FIPS 24440) Location: 40.03158 N, 75.63002 W Population (1990): 2550 (1277 housing units) Area: 8.2 sq km (land), 0.0 sq km (water) Zip code(s): 19341