Bristol Bay Borough is a borough of the U.S. state of Alaska on Bristol Bay. As of the 2020 census the borough population was 843, down from 997 in 2010, the second-least populated borough in Alaska. The borough seat is Naknek. There are no incorporated settlements. Incorporated in 1962, Bristol Bay was the first of Alaska's boroughs. It is also among the smallest, consisting of little more than the rectangle of land around Naknek on the coast and King Salmon inland.