Six Flags is based in Texas.
Six Flags . The company maintains a corporate office in Midtown Manhattan and its headquarters are in Grand Prairie , Texas . Six Flags Over Texas is a 212-acre ( 86 ha ) theme park located in Arlington , Texas , east of Fort Worth and about 15 miles ( 24 km ) west of Dallas . Texas . The term `` six flags over Texas `` For example , as used by the large Grand Prairie -- based national and international amusement park operator Six Flags refers to several nations that have ruled over the territory .