Throughout its history, the organization has had at least 50 different members associated with it. The conference had as many as 37 members at one time in the late 1950s. A major reduction in the league occurred in 1974 after the NCAA created Divisions I, II, and III. At that time, 11 members left to form the Division I East Coast Conference and by 1976, the MAC became fully associated with Division III. An additional 11 members left in 1992 to form the Centennial Conference; the football programs for eight of those schools had already left in 1981. In 1999, the current corporation formed with its three conferences: MAC Commonwealth, MAC Freedom, and Middle Atlantic.