1 definition found simi valley - U.S. Gazetteer (1990) : Simi Valley, CA (city, FIPS 72016) Location: 34.26305 N, 118.75130 W Population (1990): 100217 (33111 housing units) Area: 85.6 sq km (land), 0.7 sq km (water) Zip code(s): 93065