Past & Present Participating Schools
Participating Schools
| School | Years |
| Benson | 1955-56 |
| Bradford | 1997-2001 |
| Bureau Valley | 1996-2000 |
| Dana | 1927-1928 |
| DePue | 2008-2020 |
| Dwight | 2021-present |
| Eureka | 1994-2004 |
| (Granville) John Hopkins | 1926-1966 |
| Hennepin | Filled in for Henry in 1926 |
| Henry | 1926-1947 |
| Henry-Senachwine | 1947-present |
| Lacon | 1941-1949 |
| Lostant | 1926-1994 |
| Lowpoint Washburn | 1955-present |
| Magnolia | 1926-1946 |
| Magnolia Swaney | 1948-1966 |
| McNabb Swaney | 1926-1948 |
| Mid County | 1949-1995 |
| Midland | 1995-present |
| Ottawa Marquette | 1994-present |
| Peoria Christian | 1999-2020 |
| (Peru) St. Bede | 1994-2010, 2023 re-joined |
| Putnam County | 1966-present |
| (Putnam) Senachwine | 1926- 1927 |
| Roanoke | 1955 - 1956 |
| Roanoke Benson | 1970-present |
| Rutland | 1941-1949 |
| Seneca | 2017-present |
| Sparland | 1941-1995 |
| (Spring Valley) Hall | 2012-2014 |
| (Streator) Woodland | 2005-present |
| Toluca | 1941-1992 |
| Tonica | 1926-1990 |
| Varna | 1926-1949 |
| Wenona | 1928-1992 |
School Names & Mascots
| School | Mascot |
| Benson | Broncos |
| Bradford | Panthers |
| Bureau Valley | Storm |
| Dana | Demons |
| Depue | Little Giants |
| Dwight | Trojans |
| Eureka | Hornets |
| (Granville) John Hopkins | Hornets |
| Hennepin | Mallards |
| Henry | Mallards |
| Henry-Senachwine | Mallards |
| Lacon | Lions |
| Lostant | Rams |
| Lowpoint Washburn | Wildcats |
| Magnolia | Pirates |
| Magnolia Swaney | Pirates |
| McNabb Swaney | Pirates |
| Mid County | Bulldogs |
| Midland | Timberwolves |
| Ottawa Marquette | Crusaders |
| Peoria Christian | Chargers |
| (Peru) St. Bede | Bruins |
| Putnam County | Panthers |
| (Putnam) Senachwine | Braves |
| Roanoke | Rockets |
| Roanoke Benson | Rockets |
| Rutland | Rangers |
| Seneca | Fighting Irish |
| Sparland | Hilltoppers |
| (Spring Valley) Hall | Red Devils |
| (Streator) Woodland | Warriors |
| Toluca | Wildcats |
| Tonica | Warriors |
| Varna | Green Dragons |
| Wenona | Mustangs |
