1 definition found des plaines - U.S. Gazetteer (1990) : Des Plaines, IL (city, FIPS 19642) Location: 42.03460 N, 87.90095 W Population (1990): 53223 (20509 housing units) Area: 36.8 sq km (land), 0.3 sq km (water) Zip code(s): 60016