The casino opened as the WinStar Casinos in 2004, and was expanded (with a 395-room hotel tower) and renamed WinStar World Casino in 2009 its 370,000 square feet (34,000 m 2 ) of casino floor made it the world's largest casino. It is owned and operated by the Chickasaw Nation. WinStar World Casino and Resort is an American tribal casino and hotel located in Thackerville, Oklahoma, near the Oklahoma– Texas state line.