1 definition found castle hayne - U.S. Gazetteer (1990) : Castle Hayne, NC (CDP, FIPS 10880) Location: 34.35500 N, 77.90316 W Population (1990): 1182 (462 housing units) Area: 5.8 sq km (land), 0.1 sq km (water) Zip code(s): 28429