| Apollo | Mattoon | |
| Big Northern | | Winnebago |
| Big Twelve | | Normal Community |
| Black Diamond East | Hamilton County | |
| Black Diamond West | Christopher | |
| Cahokia Kaskaskia | Marissa | |
| Cahokia Mississippi | | |
| Central Illinois | | |
| Central State Eight | Sacred Heart-Griffin | MacArthur |
| Central Suburban League North | Maine West | N/A |
| Central Suburban League South | Maine South | N/A |
| Chicago Prep | | Butler |
| CPL Central | | |
| CPL North | | |
| CPL North-West | | |
| CPL South | | |
| CPL South-Central | | |
| CPL West | | |
| DuKane | Wheaton North, St. Charles North | |
| DuPage Valley | Naperville North | |
| East Central Illinois | | |
| East Suburban Catholic | Benet | |
| Egyptian Illini | | |
| Fox Valley | | Burlington Central |
| Girls Catholic Athletic Red | Loyola Academy | |
| Girls Catholic Athletic White | Providence Catholic | |
| Greater Egyptian | | |
| Heart of Illinois (HOIC) | | |
| Illini Prairie | | |
| Illinois Central Eight | | |
| Independent School | | |
| Inter-County Athletic Conference (ICAC) | Brimfield | |
| Interstate 8 | Sycamore | |
| Kishwaukee River | Marengo | |
| Lincoln Prairie | | |
| Lincoln Trail | | |
| Little Illini | Paris | |
| Little Okaw Valley | | |
| Little Ten | Serena | |
| Metro Suburban | Aurora Christian | |
| Mid Illini | Dunlap | Morton |
| Mid Suburban East | Hersey | Hersey |
| Mid Suburban West | Barrington, Fremd | Hersey |
| Midland Trail | Woodlawn | |
| Mississippi Valley | | |
| MSM | | |
| National Trail | | |
| NIC-10 Division A | Harlem | Hononegah |
| NIC-10 Division B | Hononegah | Hononegah |
| Noble | | |
| Northern Lake County | | |
| North Suburban | | Libertyville |
| Northeastern | | |
| NUIC | | |
| Pike County | | |
| Prairie State | Father McGivney | |
| Prairieland North | | |
| Prairieland South | Illini West | |
| River to River | | |
| River Valley | | |
| Sangamo | PORTA | |
| Sangamon Valley | Watseka | |
| South Central | | |
| South Egyptian | | |
| South Seven | | |
| South Suburban Blue | Oak Forest | |
| South Suburban Red | Oak Lawn | |
| Southland | Kankakee | Thornwood |
| Southwest Prairie East | | Joliet West |
| Southwest Prairie West | | Joliet West |
| Southwest Suburban Blue | Bolingbrook | |
| Southwest Suburban Red | Lincoln-Way West | |
| Southwestern | O’Fallon | Edwardsville |
| Three Rivers East | | |
| Three Rivers West | Riverdale | |
| Tomahawk | | |
| Tri-County | | |
| Upstate Eight | | Bartlett |
| Vermillion Valley | Salt Fork | |
| West Central | | |
| West Suburban Gold | Downers Grove South, | Willowbrook |
| West Suburban Silver | Lyons | Willowbrook |
| Western Big Six | Geneseo | |
| Western Illinois Valley | | |
