Chelan County // is a county located in the U.S. state of Washington. As of the 2010 census, its population was 72,453. It is part of the 'Wenatchee–East Wenatchee, Washington Metropolitan Statistical Area'. The county seat is at Wenatchee, which is also the county's largest city. "Chelan" derives from a Chelan Indian word meaning "deep water," likely a reference to 55-mile (89 km)-long Lake Chelan, which reaches a maximum depth of 1,486 feet (453 m).
Chelan County was created out of Okanogan and Kittitas Counties on March 13, 1899.