| Addison Trail High School | Addison | Northeast |
| Alton Senior High School | Alton | Kaskaskia |
| Auburn High School | Rockford | North Central |
| Belleville West High School | Belleville | Kaskaskia |
| Belvidere High School | Belvidere | North Central |
| Blue Ridge High School | Farmer City | Cenois |
| Byron High School | Byron | Northwest |
| Carbondale High School | Carbondale | Little Egypt |
| Carlyle High School | Carlyle | Kaskaskia |
| Chester High School | Chester | Little Egypt |
| Clifton Central High School | Clifton | Prairie 8 |
| Cumberland High School | Toledo | Eastern |
| Deer Creek-Mackinaw High School | Mackinaw | Hopewell |
| DeKalb High School | DeKalb | North Central |
| Donovan High School | Donovan | Prairie 8 |
| Eastland Jr./Sr. High School | Lanark | Northwest |
| Edinburg High School | Edinburg | Eastern |
| Elmwood High School | Elmwood | Hopewell |
| Fieldcrest High School | Minonk | Hopewell |
| Geneseo High School | Geneseo | Blackhawk |
| Glenwood High School | Chatham | Cenois |
| Granite City High School | Granite City | Kaskaskia |
| Herrin High School | Herrin | Little Egypt |
| Herscher High School | Herscher | Prairie 8 |
| Highland High School | Highland | Kaskaskia |
| Hillsboro High School | Hillsboro | Eastern |
| Hononegah High School | Rockton | North Central |
| Illini Bluffs High School | Glasford | Hopewell |
| Illinois Valley Central High School | Chillicothe | Hopewell |
| John Hancock College Prep | Chicago | Chicago |
| Johnston City High School | Johnston City | Little Egypt |
| Lake Park High School | Roselle | Northeast |
| Larkin High School | Elgin | North Central |
| Mahomet-Seymour High School | Mahomet | Kickapoo |
| Marion High School | Marion | Little Egypt |
| Mattoon High School | Mattoon | Eastern |
| Meredosia-Chambersburg High School | Meredosia | Illinois Valley |
| Midland High School | Varna | Hopewell |
| Monmouth-Roseville High School | Monmouth | Blackhawk |
| New Trier High School | Winnetka | Northeast |
| Newton High School | Newton | Eastern |
| Normal West High School | Normal | Cenois |
| Oregon Jr./Sr. High School | Oregon | Northwest |
| Pekin High School | Pekin | Hopewell |
| PORTA High School | Petersburg | Cenois |
| Reed-Custer High School | Braidwood | Prairie 8 |
| Richards High School | Oak Lawn | Northeast |
| Richmond-Burton High School | Richmond | North Central |
| Rochelle High School | Rochelle | Northwest |
| Roxana High School | Roxana | Kaskaskia |
| Sandburg High School | Orland Park | Northeast |
| Sandoval High School | Sandoval | Kaskaskia |
| Sandwich High School | Sandwich | North Central |
| Shiloh High School | Hume | Kickapoo |
| St. Charles North High School | St. Charles | North Central |
| Stillman Valley High School | Stillman Valley | Northwest |
| Sullivan High School | Sullivan | Eastern |
| Taylorville High School | Taylorville | Cenois |
| Teutopolis High School | Teutopolis | Eastern |
| Triad High School | Troy | Kaskaskia |
| Tuscola High School | Tuscola | Kickapoo |
| United Township High School | East Moline | Blackhawk |
| Waterloo High School | Waterloo | Kaskaskia |
| Wesclin High School | Trenton | Kaskaskia |
| Western High School | Barry | Illinois Valley |
| Wheaton North High School | Wheaton | Northeast |
| Willowbrook High School | Villa Park | Northeast |
| Winnebago High School | Winnebago | Northwest |
| Zeigler-Royalton High School | Zeigler | Little Egypt |