"Wow, that looks considerably different than the 4C of my youth..."
Yeah Bridgier, I was thinking the same thing.
I think back in your youth the district number was different - maybe 2C or 3C - and the teams included: Terry, Ekalaka, Wibaux, Rosebud, Hysham, Jordan, Plevna, and Busby(renamed Northern Cheyenne Tribal High School right about then).
A couple years before that (later-80's) that district also included Sacred Heart for one year (the high school dropped from Class B to Class C for '85-86 and then closed down after that) and also Pine Hills when that institution was allowed to participate in H.S. sports. After Sacred Heart closed and Pine Hills banned their participation in the district sports, Northern Cheyenne H.S. was added to that district.
Years go by, schools change classifications and teams change districts. Funny how that happens: Colstrip was class B, then moved up to A, then back down to B again, St. Labre was class B, then C, then B again.
I never thought I'd see Broadus and Forsyth decline in enrollment to the point that they'd drop to class C, but there you go.