Woodinville is a city in King County, Washington, United States. The population was 10,938 at the 2010 census. It is part of the Seattle metropolitan area. There is also a much larger population with Woodinville mailing addresses in adjacent unincorporated areas of King (Cottage Lake) and Snohomish (Maltby) counties. Woodinville has waterfront parks on the Sammamish River, sweeping winery and brewery grounds, and densely wooded residential areas. Woodinville is an affluent city, with the 34th highest average per-capita income in the state.