Pennsylvania Interscholastic Athletic Association was created in 1913.
Massachusetts Interscholastic Athletic Association was created in 1977.
Wisconsin Interscholastic Athletic Association was created in 1895.
Western Pennsylvania Interscholastic Athletic League was created in 1907.
New Hampshire Interscholastic Athletic Association was created in 1947.
New Jersey Interscholastic Athletic Association was created in 1896.
District of Columbia Interscholastic Athletic Association was created in 1958.
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.
Nevada Interscholastic Activities Association was created in 1922.
Washington Interscholastic Activities Association was created in 1920.