Three Rivers Conference (Indiana) Former members Former members

| School | Location_ | Mascot | _County | Year_joined | Previous_conference | Year_left | New_conference |
|---|---|---|---|---|---|---|---|
| Caston | Fulton | Comets | 25 Fulton | 1971 | Independents | 1978 | joined Midwest |
| Culver Community | Culver | Cavaliers | 50 Marshall | 1971 | Independents | 1976 | Independents |
| Triton | Bourbon | Trojans | 50 Marshall | 1971 | independent | 1980 | joined Northern State |
| Eastern (Greentown) | Greentown | Comets | 34 Howard | 1980 | Mid-Indiana | 1987 | joined Mid-Indiana |
| Oak Hill | Converse | Golden Eagles | 27 Grant | 1980 | Mid-Indiana | 2006 | joined Central Indiana |