Douglas County is a county located in the U.S. state of Washington. It is part of the 'Wenatchee–East Wenatchee, Washington, Metropolitan Statistical Area'. As of the 2010 census, its population was 38,431. The county seat is at Waterville, while its largest settlement is East Wenatchee Bench, although East Wenatchee is the commercial center. It was named after American statesman Stephen A. Douglas. Douglas County was created out of Lincoln County on November 28, 1883.