Tri-County Conference (Western Indiana)
The Tri-County Conference was a high school sports league that existed until the late 1960s. Originally the Sullivan County Conference, the SCC added L&M and Midland from the folding Greene County Conference, then assumed the TCC name when Cory from Clay County was added two years later. The league was hit hard by consolidation that next year, and had three members for two more years until Cory was closed.
| School | Location | Mascot | Colors | Year Joined | Previous Conference | Year Left | Conference Joined |
| Carlisle | Carlisle | Indians | <1932 | Independents | 1965 | none | |
| Dugger1 | Dugger | Bulldogs | <1932 1958 | Independents Western Indiana | 1950 1965 | Western Indiana Tri-River | |
| Fairbanks | Fairbanks | Trojans | <1932 | Independents | 1957 | none | |
| Farmersburg | Farmersburg | Plowboys | <1932 | Independents | 1957 | none | |
| Graysville | Graysville | Greyhounds | <1932 | Independents | 1962 | none | |
| Hymera | Hymera | Shakamaks | <1932 | Independents | 1965 | none | |
| Merom | Merom | Beavers | <1932 | Independents | 1953 | none | |
| New Lebanon | New Lebanon | Tigers | <1932 | Independents | 1953 | none | |
| Pleasantville | Pleasantville | Blue Streaks | <1932 | Independents | 1965 | none | |
| Shelburn | Shelburn | Panthers | <1932 | Independents | 1957 | none | |
| Sullivan | Sullivan | Golden Arrows | <1932 | Independents | 1936 | Southern Indiana | |
| Gill Township | Merom | Rockets | 1953 | none | 1957 | none | |
| North Central | Farmersburg | Thunderbirds | 1957 | none | 1967 | Independents | |
| L & M | Marco | Braves | 1961 | Greene County | 1967 | Independents | |
| Midland | Midland | Middies | 1961 | Greene County | 1964 | none |
- Dugger changed its name to Union in 1965.