Enumclaw (/ˈiːnəmklɔː/ EE-nəm-klaw) is a city in King County, Washington, United States. The population was 10,669 at the 2010 census. The 2015 estimate is 11,609. The Enumclaw Plateau, on which the city resides, was formed by a volcanic mudflow (lahar) from Mount Rainier approximately 5,700 years ago.