King Salmon is a census-designated place (CDP) in Bristol Bay Borough in the U.S. state of Alaska. As of the 2010 census the population was 374. King Salmon is the borough seat of neighboring Lake and Peninsula Borough, but does not serve that purpose in its own borough, whose borough seat is in Naknek.
In the 1930s, the U.S. government built an air navigation silo at the site of present-day King Salmon. At the beginning of World War II, the U.S. Army Air Forces built an air base around the silo. It was maintained by the Civil Aeronautics Administration throughout the war.
In the 1940s and 1950s, the U.S. Army Corps of Engineers constructed a long road from King Salmon to Naknek. Other government agencies, such as the National Park Service, Alaska Department of Fish and Game, and the United States Weather Bureau, built facilities at King Salmon. The King Salmon Inn opened in 1956.
King Salmon is one of the sites of Super Dual Auroral Radar Network.
In 2010, a local National Weather Service employee and his wife were involved in an Islamic domestic terrorism plot that had proceeded to the operational phase. A hit list of 20 people that included media and military personnel was found.