Issaquah is a city located in King County, Washington, within the United States. It is part of the Seattle metropolitan area and had a population of 40,051 as recorded during the 2020 census.
Geographically, the city is situated in a valley that is bisected by Interstate 90. It is bordered by the Sammamish Plateau to the north and the "Issaquah Alps" to the south. The city serves as the headquarters for the multinational retail company Costco Wholesale Corporation.