Cottage Lake is a census-designated place (CDP) located in King County, Washington, in the United States. According to the 2020 census, the area has a population of 22,857 residents.
The geographic area is characterized by its proximity to Cottage Lake, with developments situated east of the water falling under different administrative designations. Specifically, the lake itself is located within the 98072 ZIP code, while the eastern developments are served by the 98077 ZIP code. The census-designated area is also divided between two educational jurisdictions: the North shore school district and the Lake Washington school district.