[1] Five of the original seven schools came from the East Central Conference, four directly, while Tri was formed from the consolidation of ECC member Spiceland.
Morton Memorial, the last remaining ECC member in 1969, would join the conference that year, along with Hamilton Southeastern.
Morristown would follow suit in 1985, as the school dropped football.
Knightstown and Eastern Hancock were left as independents, though both would join the WRC six and eight years later, respectively.
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