Chefornak is a city in Bethel Census Area, Alaska, United States. At the 2010 census its population was 418, up from 394 in 2000. Cheforna…Chefornak is a city in Bethel Census Area, Alaska, United States. At the 2010 census its population was 418, up from 394 in 2000. Chefornak is located at 60°9′33″N 164°16′10″W / 60.15917°N 164.26944°W on the south bank of the Kinia River, 16 miles upriver from its mouth in Etolin Strait, an arm of the Bering Sea. The town is within the Yukon Delta National Wildlife Refuge.