The chain grew throughout Texas in the 1950s, and by 1959 was expanding to other states, the first one being Florida. Currently there are locations in seven U.S states, and in Mexico.
Whataburger is known for its distinctive triangle-shaped, orange-and-white striped restaurant buildings.
On Phoenix Suns televised basketball games, commentator Al McCoy used to advertise Whataburger by adding What a shot, Whataburger!! to his traditional Shazam! everytime a Suns player made a three point shot.