The city of Koyukuk is located in the U.S. state of Alaska. It is within Yukon-Koyukuk Census Area and of those Alaskan communities threatened by erosion. The city lies close to the mouth of the Koyukuk River 31 miles of Galena to the west. Koyukuk coordinates at 64°52′54″N 157°42′16″W. It is elevated by 118 feet above sea level. There were only 96 people living in the place in 2010. It had a population density of 16.27/sq mi. The Ella B. Vernetti School in Koyukuk is served and operated by the Yukon-Koyukuk School District. Zip code is 99754.