The Morongo is one of 25 casinos in Southern California There are a total of 66 casinos in California: 41 in Northern California, and 25 in Southern California, which we consider to be the ten most southern counties in the state. There are 25 casinos in Southern California.īut while SoCal has 22 million people and roughly 60% of the state’s population, it’s home to just 39% of the state’s casinos.