Since the 2004 vote, when Oklahoma voters passed legislation expanding Indian casino gaming, a new casino land rush has seen glitzy casinos spring up in nearly every corner of the state. The WinStar World Casino Resort is the largest casino in OklahomaĪll of these casinos are owned by Indian tribes. After all, the number one biggest casino on our list was nothing more than a bingo hall just a few years ago. The Sooner State casino market is constantly growing and expanding, and thus, this list is likely to change from year to year. Here is a list of the top ten largest casinos in Oklahoma. The cities and plains of Oklahoma are sprinkled with a number of casinos (102 to be exact), ranging from tiny truck stop slot machine rooms, all the way to the largest casino in the United States.