| Altamont High School | Altamont | Eastern |
| Belleville West High School | Belleville | Kaskaskia |
| Blue Ridge High School | Farmer City | Cenois |
| Bond County Community Unit 2 High School | Greenville | Kaskaskia |
| Carbondale High School | Carbondale | Little Egypt |
| Carlyle High School | Carlyle | Kaskaskia |
| Chester High School | Chester | Little Egypt |
| Dwight High School | Dwight | Prairie 8 |
| Edinburg High School | Edinburg | Eastern |
| Eisenhower High School | Blue Island | Northeast |
| 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 |
| Highland High School | Highland | Kaskaskia |
| Hononegah High School | Rockton | North Central |
| Huntley High School | Huntley | North Central |
| Larkin High School | Elgin | North Central |
| Midland High School | Varna | Hopewell |
| Monmouth-Roseville High School | Monmouth | Blackhawk |
| Morris Community High School | Morris | Prairie 8 |
| Mt. Vernon Township High School | Mt. Vernon | Little Egypt |
| New Trier High School | Winnetka | Northeast |
| Newark High School | Newark | Prairie 8 |
| Newton High School | Newton | Eastern |
| Normal West High School | Normal | Cenois |
| Oregon Jr./Sr. High School | Oregon | Northwest |
| PORTA High School | Petersburg | Illinois Valley |
| Quincy Senior High School | Quincy | Illinois Valley |
| Roxana High School | Roxana | Kaskaskia |
| Sangamon Valley High School | Niantic | Cenois |
| Shelbyville High School | Shelbyville | Eastern |
| 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 |
| Trico High School | Campbell Hill | Little Egypt |
| Wesclin High School | Trenton | Kaskaskia |
| West Carroll High School | Savanna | Northwest |
| Wethersfield High School | Kewanee | Blackhawk |
| Windsor High School | Windsor | Eastern |
| York High School | Elmhurst | Northeast |
| Zeigler-Royalton High School | Zeigler | Little Egypt |