Tanacross is a census-designated place (CDP) in Southeast Fairbanks Census Area, Alaska, United States. At the 2010 census the population was 136, down from 140 in 2000. It hosts an air tanker base.

Southeast Fairbanks Census Area is a census area located in the U.S. state of Alaska. As of the 2020 census, the population was 6,808, down from 7,029 in 2010. It is part of the unorganized borough and therefore has no borough seat. Its largest communities are Deltana and Tok, both unincorporated CDPs.