1 definition found koyuk - U.S. Gazetteer (1990) : Koyuk, AK (city, FIPS 41940) Location: 64.93285 N, 161.14835 W Population (1990): 231 (70 housing units) Area: 11.7 sq km (land), 0.0 sq km (water) Zip code(s): 99753