Kirkland is a city in King County, Washington, United States. A suburb east of Seattle, its population was 89,557 in a 2018 census estimate, which made it the sixth largest city in the county and the thirteenth largest in the state.
Kirkland was the original home of the Seattle Seahawks; the NFL team’s headquarters and training facility were located at the Lake Washington Shipyard (now Carillon Point) along Lake Washington for their first ten seasons (1976–85), then at nearby Northwest University through 2007. Warehouse chain Costco previously had its headquarters in Kirkland. While Costco is now headquartered in Issaquah, the city is the namesake of its “Kirkland Signature” store brand.