Wikipedia: Six Flags, Inc. is one of the world's largest chains of amusement parks and theme parks, based on quantity of properties. The company maintains 21 properties located throughout North America, including theme parks, water parks and family entertainment centers. In 2007, Six Flags properties hosted approximately 24.9 million guests, making it the fourth-most popular theme park company in the world. The company was founded in Texas and took its name from its first property, Six Flags Over Texas, and the six flags that have flown over the state of Texas during its history, namely those of Spain, France, Mexico, The Republic of Texas, The Confederate States of America,and the United States of America. The company maintains its headquarters in Midtown Manhattan, New York City and a corporate office in Grand Prairie, Texas.