King Salmon is a census-designated place in Bristol Bay Borough in the U.S. state of Alaska. It is two hundred and eighty-four miles southwest of Anchorage. As of the 2010 census the population was 374. It is home to Katmai National Park and Preserve. 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.