Potbelly Corporation operates primarily as a fast-casual restaurant. The Company owns and operates Potbelly Sandwich Shop concept in the United States. It also has domestic franchise operations of Potbelly Sandwich Shop concepts. Its shops are located in multiple types of neighborhoods and formats, including suburban, urban, central business districts, airports, and others. Its menu includes toasty hot sandwiches, signature salads, soups, chili, sides, freshly baked cookies, hand-dipped shakes and, in its breakfast locations, breakfast sandwiches. The Company operates approximately 440 shops in 31 states and the District of Columbia. Of these, the Company operates 90 franchised shops. The Company-operated shops are located in various areas, such as Illinois, Indiana, Texas, Massachusetts, Michigan, Oregon, Virginia, Kansas, District of Columbia, Oklahoma, Minnesota, Kentucky, Wisconsin, Missouri, Maryland, Pennsylvania, Ohio, Utah, Arizona, and Colorado.