 As of 1978 there were three Koyukon Language dialects (Lower, Central and Upper).Lower Koyukon
was spoken in Kaltag and Nulato; Central Koyukon was spoken on the Yukon River in the villages of Galena, Ruby, Koyukuk and part of Tanana, and on the Koyukuk River in the villages of Huslia, Hughes, and Allakaket; Upper Koyukon was spoken at Stevens Village, Rampart, and part of Tanana.In 2012, Susan Pavskan reported