There are 21 different six flags theme parks they are located in : 3 in california, one at dubai, one on mexico, 2 at georgia, one at illinois, one at kentucky, one at maryland, one at massachusets, one at missouri, 3 at new jersey, 2 at new york, 3 at texas, one at canada, one at united arab emirates
Nationally, there are 15 parks total, if you count theme parks and water parks as separate parks. There are 3 parks in California, 2 in Georgia, 1 in Illinois, 1 in Maryland, 1 in Massachusetts, 1 in Missouri, 2 in New Jersey, 1 in New York, and 3 in Texas.
18 different Six Flags theme parks (a few of those count for Hurricane Harbor, their water park). There are 3 parks in california, 2 in Georgia, 1 in Illinois, Kentucky, Maryland, Massachusetts, Missouri, 3 in New Jersey, 2 in New York, 3 in Texas, 1 in Mexico, Canada and Dubai.
There are 14 theme parks located in California, Georgia, Illinois, Maryland, Massachusetts, Missouri, New Jersey, New York, Texas, Montreal Canada, Mexico City Mexico and Dubai.