But times have changed and breakfast isn't just for the morning any more. With our full menu available all day every day, guests can also order the Jumbo Breakfast Platter for lunch, dinner or as a late-night meal." Jack in the Box Inc., based in San Diego, is a restaurant company that operates and franchises Jack in the Box restaurants, one of the nation's largest hamburger chains, with more than 2,200 restaurants in 19 states. Additionally, through a wholly owned subsidiary, the company operates and franchises Qdoba Mexican Grill, a leader in fast-casual dining, with more than 550 restaurants in 42 states and the District of Columbia.