King County is a county located in the U.S. state of Washington. The population was 2,269,675 in the 2020 census, making it the most populous county in Washington, and the 12th-most populous in the United States. The county seat is Seattle, also the state's most populous city.
Country: United States
State: Washington
Founded: December 22, 1852
Named for: William R. King (1852–2005) · Martin Luther King Jr. (since 2005)
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