1 definition found waianae - U.S. Gazetteer (1990) : Waianae, HI (CDP, FIPS 74450) Location: 21.44940 N, 158.18401 W Population (1990): 8758 (2264 housing units) Area: 8.9 sq km (land), 4.4 sq km (water) Zip code(s): 96792