Gotham's Coal District is located on its own unnamed island, and is a center for steel production in New Jersey. Cobblepot Steel concentrates on government contracts, such as ships and naval armor, and on construction beams, especially for skyscrapers and bridges. Its subsidiary Cobblepot Shipbuilding Corporation operated in Tricorner until the recent financial crash brought production to a halt.

Steel production still continues in the Coal District today, but only at a fraction of the pace it did during The Roaring 20's when automobiles were all the rage.