king_county,_washington | country | united_states <sep> king county is located in the us state of washington the population was 2,269,675 in the 2020 census, making it the most populous county in washington, and the 13th-most populous in the united states the county seat is seattle, also the state's most populous city the county is named after martin luther king jr, a prominent civil rights activist during the civil rights movement 
king county .washington is located in the united states.king county is the 13th-most populous in the united states