Issaquah  is a city in King County, Washington, United States. The population was 40,051 at the 2020 census.Located in a valley and bisected by Interstate 90, the city is bordered by the Sammamish Plateau to the north and the "Issaquah Alps" to the south. It is home to the headquarters of the multinational retail company Costco Wholesale Corporation. Issaquah is included in the Seattle metropolitan area. 

 

The town's industries remained similar through most of the century, with Boeing providing the majority of employment in the area. Microsoft and other technological industries moved into Redmond and other cities in the area, and later established operations in Issaquah itself. In June 1996, Costco moved its global headquarters to Issaquah from nearby Kirkland.