| Batavia High School | Batavia | North Central | 2020 |
| Cambridge High School | Cambridge | Blackhawk | 2020 |
| Canton High School | Canton | Illinois Valley | 2020 |
| Casey-Westfield High School | Casey | Eastern | 2020 |
| Centennial High School | Champaign | Kickapoo | 2020 |
| Chicago Collegiate Charter High School | Chicago | Chicago | 2020 |
| Cisne High School | Cisne | Eastern | 2020 |
| Clay City High School | Clay City | Eastern | 2020 |
| Cobden High School | Cobden | Little Egypt | 2020 |
| Curie Metropolitan High School | Chicago | Chicago | 2020 |
| Donovan High School | Donovan | Prairie 8 | 2020 |
| DuQuoin High School | DuQuoin | Little Egypt | 2020 |
| Edwardsville High School | Edwardsville | Kaskaskia | 2020 |
| Effingham High School | Effingham | Eastern | 2020 |
| Eldorado High School | Eldorado | Little Egypt | 2020 |
| Evanston Township High School | Evanston | Northeast | 2020 |
| Fairfield Community High School | Fairfield | Eastern | 2020 |
| Freeburg High School | Freeburg | Kaskaskia | 2020 |
| Freeport High School | Freeport | Northwest | 2020 |
| Fulton High School | Fulton | Northwest | 2020 |
| Gallatin County High School | Junction | Little Egypt | 2020 |
| Hamilton County High School | McLeansboro | Little Egypt | 2020 |
| Heritage High School | Broadlands | Kickapoo | 2020 |
| Hoopeston Area High School | Hoopeston | Kickapoo | 2020 |
| Indian Creek High School | Shabbona | North Central | 2020 |
| Intrinsic Schools | Chicago | Chicago | 2020 |
| Joliet Catholic Academy | Joliet | Prairie 8 | 2020 |
| Larkin High School | Elgin | North Central | 2020 |
| MacArthur High School | Decatur | Cenois | 2020 |
| Madison High School | Madison | Kaskaskia | 2020 |
| Mahomet-Seymour High School | Mahomet | Kickapoo | 2020 |
| Marmion Academy | Aurora | North Central | 2020 |
| Mascoutah High School | Mascoutah | Kaskaskia | 2020 |
| Meridian High School | Macon | Cenois | 2020 |
| Midland High School | Varna | Hopewell | 2020 |
| Minooka Community High School | Minooka | Prairie 8 | 2020 |
| Monmouth-Roseville High School | Monmouth | Blackhawk | 2020 |
| Mt. Pulaski High School | Mt. Pulaski | Cenois | 2020 |
| Mt. Zion High School | Mt. Zion | Cenois | 2020 |
| Peoria Heights High School | Peoria Heights | Hopewell | 2020 |
| Pittsfield High School | Pittsfield | Illinois Valley | 2020 |
| Pope County High School | Golconda | Little Egypt | 2020 |
| Princeton High School | Princeton | Blackhawk | 2020 |
| Quincy Notre Dame High School | Quincy | Illinois Valley | 2020 |
| Rantoul High School | Rantoul | Kickapoo | 2020 |
| Red Bud High School | Red Bud | Kaskaskia | 2020 |
| Serena High School | Serena | North Central | 2020 |
| St. Joseph High School | Westchester | Northeast | 2020 |
| St. Viator High School | Arlington Heights | Northeast | 2020 |
| Sterling High School | Sterling | Northwest | 2020 |
| Thornton Fractional North High School | Calumet City | Northeast | 2020 |
| Trinity Oaks Christian Academy | Cary | Northeast | 2020 |
| Unity High School | Tolono | Kickapoo | 2020 |
| Villa Grove High School | Villa Grove | Kickapoo | 2020 |
| Wauconda High School | Wauconda | Northeast | 2020 |
| Wheaton North High School | Wheaton | Northeast | 2020 |
| Whitney Young High School | Chicago | Chicago | 2020 |
| Willowbrook High School | Villa Park | Northeast | 2020 |
| Windsor High School | Windsor | Eastern | 2020 |
| Winnebago High School | Winnebago | Northwest | 2020 |
| Woodstock High School | Woodstock | North Central | 2020 |
| York High School | Elmhurst | Northeast | 2020 |