1 definition found earlham - U.S. Gazetteer (1990) : Earlham, IA (city, FIPS 23340) Location: 41.49219 N, 94.12197 W Population (1990): 1157 (456 housing units) Area: 1.8 sq km (land), 0.0 sq km (water) Zip code(s): 50072