The Kingdome (officially King County Multipurpose Domed Stadium) was a multi-purpose stadium in Seattle, Washington, located in the city's SoDo neighborhood. Owned and operated by King County, the Kingdome opened in 1976 and was best known as the home stadium of the Seattle Seahawks of the National Football League (NFL), the Seattle Mariners of Major League Baseball (MLB), and the Seattle SuperSonics of the National Basketball Association (NBA). The stadium served as both the home outdoor and indoor venue for the Seattle Sounders of the North American Soccer League (NASL) and hosted numerous amateur sporting events, concerts, and other events. The Kingdome was 660 feet wide (as measured from its inside walls)