The Seattle SuperSonics were an American professional basketball team based in Seattle, Washington. They played in the Western, Pacific and Northwest divisions of the Western Conference in the National Basketball Association (NBA). The team joined the NBA in 1967 as an expansion team, and won their first and only NBA Championship out of 22 playoffs appearances in the 1979 NBA Finals. The SuperSonics played their home games mainly at the Seattle Center Coliseum, the Kingdome during eight seasons, and the Tacoma Dome for one season while the Coliseum was being remodeled and later renamed KeyArena.