Founded in 1919, it was originally comprised the following small high schools in northern Illinois: Earlville, Hinckley, Leland, Paw Paw, Plano, Rollo, Sandwich, Shabbona, Somonauk, and Waterman.
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Sandwich (1919–1967, Joined Northeast Conference, then Interstate Eight Conference in 1979-80 with Plano)*
Sandwich High School is an active member of the Interstate Eight Conference, and competes in IHSA regulated sports competitions.
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