The most notable characteristic of St. Louis-style pizza is the distinctively St. Louisan provel cheese used instead of (or, rarely, in addition to) the mozzarella common to other styles of pizza.
The pizza has a thin, round crust, as opposed to Chicago-style pizza or New York-style pizza. The crust of a St. Louis pizza is somewhat crisp and cannot be folded easily and is typically cut into three- or four-inch squares instead of the pie-like wedges typical of many pizza styles. Some local restaurants make their pizzas rectangular rather than round. It is often salty and seasoned with more oregano than other pizza types. Despite its thin crust, it can be layered deeply with many different toppings. Sauces tend to have a sweetness to them, some more noticeably than others.
The three largest St. Louis-style Pizza chains are Imo's Pizza, Cecil Whittaker's Pizzeria, and Fortel's Pizza Den.