Pennsylvania Interscholastic Athletic Association was created in 1913.
Wisconsin Interscholastic Athletic Association was created in 1895.
Massachusetts Interscholastic Athletic Association was created in 1977.
Western Pennsylvania Interscholastic Athletic League was created in 1907.
New Hampshire Interscholastic Athletic Association was created in 1947.
District of Columbia Interscholastic Athletic Association was created in 1958.
New Jersey Interscholastic Athletic Association was created in 1896.
Pennsylvania Interscholastic Marching Band Association was created in 1993.
New Jersey State Interscholastic Athletic Association was created in 1918.
Pennsylvania Collegiate Athletic Association was created in 1979.
Arizona Interscholastic Association was created in 1925.
Washington Interscholastic Activities Association was created in 1920.
Nevada Interscholastic Activities Association was created in 1922.