Regionals were referred to as Districts 1979 and before.
Mahomet-Seymour was single A in a 1 class system until 1976.
Mahomet-Seymour was single A in a 2 class system until 1997.
Mahomet-Seymour was double A in a 2 class system from 1997-2006.
Mahomet-Seymour is double A in a 3 class system from 2007- current.