SNC Members School from 1928-Present Date
The history of the SNC is tough because there have been a bunch of leagues that called themselves Southern Nebraska. Quite a few of the modern SNC teams were in a Southern Nebraska in the 20s and 30s though that went dormant at the end of WWII. It is assumed that a new league used the name So Nebr 6 starting in 1953. It moved west in 58 and 60. The current league may be directly descended from that SNC6, but it definitely comes from the SNC organized in 1965 and divided into divisions with football and basketball playoff games.
(Source: Greg Mays, www.suitingupvarsity.org)