King County is a county located in the U.S. state of Washington. The population was 2,188,649 in the 2017 census estimate. King is the most populous county in Washington, and the 13th-most populous in the United States. The county seat is Seattle, which is the state's largest city.
King County is one of three Washington counties that are included in the Seattle–Tacoma–Bellevue metropolitan statistical area. (The others are Snohomish County to the north, and Pierce County to the south.) About two-thirds of King County's population lives in Seattle's suburbs.
According to the U.S. Census Bureau, the county has a total area of 2,307 square miles (5,980 km²), of which 2,116 square miles (5,480 km²) is land and 191 square miles (490 km²) (8.3%) is water. King County has nearly twice the land area of the state of Rhode Island. The highest point in the county is Mount Daniel at 2,426 meters (7,959 feet) above sea level.
King County borders Snohomish County to the north, Kitsap County to the west, Kittitas County to the east, and Pierce County to the south. It also shares a small border with Chelan County to the northeast. King County includes Vashon Island and Maury Island in Puget Sound.
The center of population of the state of Washington in 2010 was located in eastern King County (47.330750°N 121.619994°W). King County's own center of population was located on Mercer Island (47.548320°N 122.229983°W).
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