Six Flags Entertainment Corporation, also known as Six Flags Theme Parks or simply Six Flags, is an amusement park corporation based in the United States, with properties in the US, Canada and Mexico. It is the largest amusement park company in the world, based on the number of properties owned and is ranked seventh in terms of attendance. The company operates 25 properties throughout North America, including theme parks, amusement parks, water parks and a family entertainment center. In 2017, Six Flags properties hosted 30. 4 million guests.