Speedway SuperAmerica is one of the largest chains of company owned and operated gasoline and convenience stores in the United States and operates stores primarily under the Speedway and SuperAmerica brand names. With more than 1,600 stores, it works to meet the fueling and convenience needs of over 2.4 million customers. Speedway SuperAmerica operates in nearly 10 states throughout the Midwest, including Ohio, Michigan, Indiana, Illinois, Kentucky, West Virginia, Minnesota, Wisconsin and South Dakota. The company offers a variety of credit and prepaid cards, including SuperFleet and Speedway SuperAmerica Platinum MasterCard. It is a wholly owned subsidiary of Marathon Oil Corporation. Speedway SuperAmerica maintains its headquarters in Enon, Ohio.