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Jack in the Box is an American fast-food restaurant founded in 1951 by Robert O. Peterson in San Diego, California, where it is still headquartered today. In total, the chain has 2,200 locations, primarily serving the West Coast of the United States. Food items include the Jumbo Jack, Sourdough Jack, Sausage, Egg, and Cheese Biscuit, and the Ultimate Cheeseburger. The company also operates the Qdoba Mexican Grill chain.