Kirkland is a city in King County, Washington, United States. A suburb east of Seattle, its population was 87,281 at the 2015 census estimate, which made it the sixth largest city in the county and the twelfth largest in the state.The city's downtown waterfront has restaurants, art galleries, a performing arts center, public parks, beaches, and a collection of public art, primarily bronze sculptures.Kirkland was the original home of the Seattle Seahawks; the NFL team's headquarters and training facility were located at Carillon Point along Lake Washington for their first ten seasons, then at nearby Northwest University through 2007. Warehouse chain Costco previously had its headquarters in Kirkland; the city is the namesake of its "Kirkland Signature" store brand.The 1982 Kirkland National Little League team won the Little League World Series in Williamsport, Pennsylvania. That event is the subject of the ESPN 30 for 30 documentary Little Big Men.