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| Team | State | Class | District |
|---|---|---|---|
| Abingdon-Avon | IL | 1A | LincolnLand (South) |
| Addison Trail | IL | 6A | West Suburban (Gold) |
| Agricultural Science | IL | 5A | Chicago Public, Red Southwest |
| Alleman | IL | — | Western Big 6 |
| Althoff | IL | 3A | Metro-Valley |
| Alton | IL | — | Southwestern (Black) |
| Alton Marquette | IL | 4A | Metro-Valley |
| Amundsen | IL | 6A | Chicago Public, Red Shield |
| Andrew | IL | 7A | Southwest Suburban |
| Anna-Jonesboro | IL | — | Southern Illinois River-to-River (Mississippi) |
| Antioch | IL | 6A | Northern Lake County |
| Arcola | IL | — | Lincoln Prairie |
| Argenta-Oreana | IL | — | Lincoln Prairie |
| Argo | IL | — | South Suburban (Red) |
| Arthur-Lovington | IL | 2A | Lincoln Prairie |
| Athens | IL | 1A | Sangamo |
| Auburn | IL | 2A | Sangamo |
| Aurora Central Cath | IL | 4A | Independent Schools |
| Aurora Christian | IL | 2A | Chicagoland Christian |
| Aurora East | IL | 8A | UpState 8 (West) |
| A.-Wethersfield | IL | 1A | LincolnLand (North) |
| Back of the Yards | IL | — | Chicago Public, Blue South |
| Barrington | IL | 8A | Mid-Suburban (West) |
| Bartlett | IL | 7A | UpState 8 (West) |
| Batavia | IL | 7A | DuKane |
| Beardstown | IL | 2A | Western Illinois Valley (North) |
| Belleville East | IL | 7A | Southwestern (Gold) |
| Belleville West | IL | — | Southwestern (Gold) |
| Belvidere | IL | — | Northern Illinois (NIC 10) |
| Belvidere North | IL | 5A | Northern Illinois (NIC 10) |
| Benet | IL | 7A | CCL (Purple) |
| Benton | IL | 3A | Southern Illinois River-to-River (Mississippi) |
| Bismarck-Henning | IL | 2A | Vermilion Valley |
| Bloom | IL | 8A | Southland |
| Bloomington | IL | 5A | Big Twelve |
| Bloomington Central Catholic | IL | 3A | Illini Prairie |
| Blue Island Eisenhower | IL | — | South Suburban (Red) |
| Bogan | IL | — | Chicago Public, White South |
| Bolingbrook | IL | 8A | Southwest Prairie (West) |
| Bowen | IL | — | Chicago Public, White South |
| Boylan | IL | — | Northern Illinois (NIC 10) |
| Bradley-Bourbonnais | IL | 6A | Southwest Suburban |
| Breese Central | IL | 4A | Cahokia (Mississippi) |
| Bremen | IL | — | South Suburban (Blue) |
| Bronzeville | IL | — | Chicago Public, White Central |
| Brooks | IL | 6A | Chicago Public, Red Southwest |
| Brother Rice | IL | 7A | CCL (Blue) |
| Brown County | IL | 1A | Western Illinois Valley (North) |
| Buffalo Grove | IL | 7A | Mid-Suburban (East) |
| Bulls Academy | IL | 6A | Chicago Public, Red Shield |
| Bureau Valley | IL | 1A | LincolnLand (North) |
| Byron | IL | 3A | Big Northern |
| Cahokia | IL | 4A | South Seven |
| Calhoun | IL | 1A | Western Illinois Valley (South) |
| Camp Point Cen. | IL | 1A | Western Illinois Valley (North) |
| Canton | IL | — | Mid-Illini |
| Carbondale | IL | 5A | South Seven |
| Carlinville | IL | 2A | South Central |
| Carlyle | IL | 1A | Cahokia (Illinois) |
| Carmel | IL | 6A | CCL (Orange) |
| Carmi-White County | IL | 2A | Black Diamond |
| Carrollton | IL | 1A | Western Illinois Valley (South) |
| Carterville | IL | 4A | Southern Illinois River-to-River (Ohio) |
| Carver | IL | 4A | Chicago Public, White South |
| Cary-Grove | IL | 5A | Fox Valley |
| Casey-Westfield | IL | 1A | Little Illini |
| Catalyst Maria | IL | — | — |
| Central | IL | 6A | Fox Valley |
| Central A & M | IL | 2A | Heart of Central Illinois (Large) |
| Centralia | IL | 4A | Cahokia (Mississippi) |
| Cerro Gordo-Bement | IL | — | 8-Player - South |
| Champaign Centennial | IL | 5A | Big Twelve |
| Champaign Central | IL | 6A | Big Twelve |
| Charleston | IL | — | Apollo |
| Chester | IL | 2A | Cahokia (Illinois) |
| Chicago Academy | IL | — | Chicago Public, Blue North |
| Chicago Christian | IL | 3A | Chicagoland Christian |
| Chicago Jones | IL | — | Independent Schools |
| Chicago Marshall | IL | 2A | Chicago Public, Red West |
| Chicago Richards | IL | 2A | Chicago Public, White Central |
| Chicago Vocational | IL | — | Chicago Public, Red South |
| Chicago Washington | IL | — | Chicago Public, Blue South |
| Christ the King | IL | — | Chicagoland Christian |
| Cicero Morton | IL | — | West Suburban (Gold) |
| Civic Memorial | IL | 4A | Cahokia (Mississippi) |
| Clark | IL | — | Chicago Public, Red West |
| Clemente | IL | — | Chicago Public, White North |
| Clifton Central | IL | 1A | Vermilion Valley |
| Clinton | IL | — | Heart of Central Illinois (Large) |
| Coal City | IL | 4A | Illinois Central Eight |
| Collins | IL | — | Chicago Public, White Central |
| Collinsville | IL | 7A | Southwestern (Black) |
| Columbia | IL | 3A | Cahokia (Mississippi) |
| Comer | IL | 5A | Chicago Public, Red South |
| Conant | IL | 8A | Mid-Suburban (West) |
| Corliss | IL | 5A | Chicago Public, Red South |
| Crane Medical | IL | 1A | Chicago Public, Red West |
| Crete-Monee | IL | 6A | Southland |
| Crystal Lake Central | IL | — | Fox Valley |
| Crystal Lake South | IL | 5A | Fox Valley |
| Cumberland | IL | 1A | Lincoln Prairie |
| Curie | IL | 8A | Chicago Public, Red North |
| C.-Zeigler-Royalton | IL | 2A | Black Diamond |
| Dakota | IL | — | Northwest Upstate Illini |
| Danville | IL | 5A | Big Twelve |
| Decatur Eisenhower | IL | — | Central State Eight (East) |
| Deer Creek-Mackinaw | IL | 1A | Heart of Central Illinois (Small) |
| Deerfield | IL | 5A | Central Suburban (Central) |
| DeKalb | IL | — | DuPage Valley |
| De La Salle | IL | — | CCL (Red) |
| DePaul | IL | 7A | CCL (White) |
| Dixon | IL | 4A | Big Northern |
| Downers Grove North | IL | 7A | West Suburban (Silver) |
| Downers Grove South | IL | 8A | West Suburban (Gold) |
| DRW Trading | IL | — | Chicago Public, Blue West |
| Dunbar | IL | — | Chicago Public, White Central |
| Dundee-Crown | IL | 8A | Fox Valley |
| Dunlap | IL | 6A | Mid-Illini |
| Dupo | IL | 1A | Cahokia (Illinois) |
| DuQuoin | IL | 2A | Southern Illinois River-to-River (Mississippi) |
| Durand-Pecatonica | IL | 3A | Big Northern |
| DuSable | IL | — | Chicago Public, Blue South |
| Dwight | IL | 1A | Chicagoland Prairie |
| Dwight/Gardner-So. Wilmington | IL | — | — |
| Dyett | IL | 3A | Chicago Public, Red South |
| Eastland-Pearl City | IL | 2A | Northwest Upstate Illini |
| East Moline United | IL | 6A | Western Big 6 |
| East Peoria | IL | 4A | Mid-Illini |
| East St Louis | IL | 6A | Southwestern (Gold) |
| Edwards County | IL | — | Black Diamond |
| Edwardsville | IL | 7A | Southwestern (Gold) |
| Effingham | IL | 4A | Apollo |
| Eldorado | IL | — | Black Diamond |
| Elgin | IL | 7A | UpState 8 (West) |
| Elk Grove | IL | 6A | Mid-Suburban (East) |
| Elmwood-Brimfield | IL | 2A | LincolnLand (West) |
| Elmwood Park | IL | — | UpState 8 (East) |
| El Paso-Gridley | IL | 2A | Heart of Central Illinois (Large) |
| Englewood STEM | IL | — | Chicago Public, Blue South |
| Erie-Prophetstown | IL | 2A | Three Rivers (Rock) |
| Eureka | IL | 3A | Heart of Central Illinois (Large) |
| Evanston | IL | 8A | Central Suburban (South) |
| Evergreen Park | IL | — | South Suburban (Red) |
| Fairfield | IL | 3A | Black Diamond |
| Farmington | IL | 2A | LincolnLand (West) |
| Fenger | IL | — | Chicago Public, Blue South |
| Fenton | IL | 5A | UpState 8 (East) |
| Fenwick | IL | 6A | CCL (Orange) |
| Fieldcrest | IL | — | — |
| Fisher | IL | — | Lincoln Prairie |
| Flora | IL | 2A | Black Diamond |
| Foreman | IL | — | Chicago Public, White North |
| Forfeit | IL | — | — |
| Forreston | IL | 1A | Northwest Upstate Illini |
| Freeburg | IL | 4A | Cahokia (Mississippi) |
| Freeport | IL | 5A | Northern Illinois (NIC 10) |
| Fremd | IL | 8A | Mid-Suburban (West) |
| Fulton | IL | 1A | Northwest Upstate Illini |
| Gage Park | IL | — | Chicago Public, Blue West |
| Galena | IL | 1A | Northwest Upstate Illini |
| Galesburg | IL | 5A | Western Big 6 |
| Geneseo | IL | 4A | Western Big 6 |
| Geneva | IL | — | DuKane |
| Genoa-Kingston | IL | 3A | Big Northern |
| Georgetown-Ridge Farm | IL | 2A | Vermilion Valley |
| Gibson City-Melvin-Sibley | IL | 1A | Heart of Central Illinois (Small) |
| Gillespie | IL | — | South Central |
| Glenbard East | IL | 7A | UpState 8 (East) |
| Glenbard North | IL | 7A | DuKane |
| Glenbard South | IL | 5A | UpState 8 (East) |
| Glenbard West | IL | 7A | West Suburban (Silver) |
| Glenbrook North | IL | 7A | Central Suburban (Central) |
| Glenbrook South | IL | 8A | Central Suburban (South) |
| Glenwood | IL | 6A | Central State Eight (East) |
| G.-Northwestern | IL | 1A | Western Illinois Valley (South) |
| Golder | IL | — | — |
| Goode STEM | IL | 6A | Chicago Public, Red Southwest |
| Granite City | IL | — | Southwestern (Black) |
| Grant | IL | 6A | Northern Lake County |
| Grayslake Central | IL | 5A | Northern Lake County |
| Grayslake North | IL | 5A | Northern Lake County |
| Greenville | IL | 3A | South Central |
| Guilford | IL | 7A | Northern Illinois (NIC 10) |
| Hall | IL | — | Three Rivers (Mississippi) |
| Hamilton County | IL | 2A | Black Diamond |
| Hampshire | IL | 7A | Fox Valley |
| Hansberry | IL | — | Chicago Public, Blue South |
| Harlan | IL | — | — |
| Harlem | IL | 6A | Northern Illinois (NIC 10) |
| Harrisburg | IL | 3A | Southern Illinois River-to-River (Ohio) |
| Harvard | IL | — | Kishwaukee River |
| Havana | IL | 1A | LincolnLand (South) |
| Herrin | IL | — | Southern Illinois River-to-River (Ohio) |
| Herscher | IL | 3A | Illinois Central Eight |
| Hersey | IL | 7A | Mid-Suburban (East) |
| Heyworth | IL | 1A | Heart of Central Illinois (Small) |
| Highland | IL | 4A | South Seven |
| Highland Park | IL | 6A | Central Suburban (Central) |
| Hillcrest | IL | 4A | South Suburban (Blue) |
| Hillsboro | IL | 3A | South Central |
| Hinsdale Central | IL | 8A | West Suburban (Silver) |
| Hinsdale South | IL | 5A | West Suburban (Gold) |
| Hoffman Estates | IL | 7A | Mid-Suburban (West) |
| Homewood-Flossmoor | IL | 8A | Southwest Suburban |
| Hononegah | IL | 6A | Northern Illinois (NIC 10) |
| Hoopeston Area | IL | — | Vermilion Valley |
| Hope Academy | IL | 3A | Chicagoland Christian |
| Hubbard | IL | — | Chicago Public, White West |
| Huntley | IL | 8A | Fox Valley |
| Hyde Park | IL | — | Chicago Public, Red Southwest |
| IC Catholic | IL | 3A | CCL (White) |
| Illini West | IL | 2A | LincolnLand (West) |
| Iroquois West | IL | — | Vermilion Valley |
| ITW Speer | IL | — | Chicago Public, White West |
| IVC | IL | 4A | Illini Prairie |
| Jacksonville | IL | 4A | Central State Eight (West) |
| Jacobs | IL | 7A | Fox Valley |
| Jefferson | IL | 7A | Northern Illinois (NIC 10) |
| Jerseyville | IL | 4A | Cahokia (Mississippi) |
| Johnsburg | IL | 3A | Kishwaukee River |
| Johnson | IL | 4A | Chicago Public, Red South |
| Johnston City | IL | 2A | Black Diamond |
| Joliet Catholic | IL | 6A | CCL (White) |
| Joliet Central | IL | 8A | Southwest Prairie (East) |
| Joliet West | IL | 8A | Southwest Prairie (East) |
| Julian | IL | — | Chicago Public, White South |
| Kaneland | IL | 5A | Interstate 8 |
| Kankakee | IL | 5A | Southland |
| Kelly | IL | — | Chicago Public, Blue West |
| Kennedy | IL | 6A | Chicago Public, White West |
| Kenwood | IL | 7A | Chicago Public, Red Shield |
| Kewanee | IL | 3A | Three Rivers (Mississippi) |
| King | IL | 5A | Chicago Public, Red Star |
| Knoxville | IL | 1A | LincolnLand (North) |
| Lake Forest | IL | — | North Suburban |
| Lake Park | IL | 8A | DuKane |
| Lakes | IL | 5A | Northern Lake County |
| Lake View | IL | 5A | Chicago Public, White North |
| Lake Zurich | IL | 6A | North Suburban |
| Lane | IL | 8A | Chicago Public, Red Shield |
| Lanphier | IL | — | Central State Eight (West) |
| Larkin | IL | — | UpState 8 (West) |
| LaSalle-Peru | IL | 5A | Interstate 8 |
| Lawrenceville | IL | — | Little Illini |
| Lemont | IL | 5A | South Suburban (Blue) |
| Lena-Winslow | IL | 1A | Northwest Upstate Illini |
| Leo | IL | 4A | CCL (Red) |
| LeRoy | IL | 1A | Heart of Central Illinois (Small) |
| Lewistown | IL | — | LincolnLand (South) |
| Leyden | IL | 8A | West Suburban (Gold) |
| Libertyville | IL | 6A | North Suburban |
| Limestone | IL | — | Mid-Illini |
| Lincoln | IL | 4A | Central State Eight (East) |
| Lincoln Park | IL | 7A | Chicago Public, Red Shield |
| Lincoln-Way Central | IL | 7A | Southwest Suburban |
| Lincoln-Way East | IL | 8A | Southwest Suburban |
| Lincoln-Way West | IL | 7A | Southwest Suburban |
| Lindblom | IL | 6A | Chicago Public, Red Southwest |
| Lisle | IL | 3A | Illinois Central Eight |
| Litchfield | IL | — | South Central |
| Little Village | IL | — | Chicago Public, Blue West |
| Lockport | IL | 8A | Southwest Suburban |
| Longwood | IL | — | Chicago Public, White South |
| Loyola Academy | IL | 8A | CCL (Blue) |
| Lyons Township | IL | 8A | West Suburban (Silver) |
| MacArthur | IL | 4A | Central State Eight (East) |
| Macomb | IL | 4A | LincolnLand (West) |
| Macon Meridian | IL | — | 8-Player - South |
| Madison | IL | — | Metro-Valley |
| Mahomet-Seymour | IL | 5A | Apollo |
| Maine East | IL | — | Central Suburban (North) |
| Maine South | IL | 8A | Central Suburban (South) |
| Maine West | IL | 6A | Central Suburban (North) |
| Manteno | IL | 3A | Illinois Central Eight |
| Manual | IL | — | Big Twelve |
| Marengo | IL | 4A | Kishwaukee River |
| Marian Catholic | IL | — | CCL (Red) |
| Marine | IL | — | Chicago Public, Blue North |
| Marion | IL | 5A | South Seven |
| Marist | IL | 8A | CCL (Blue) |
| Marmion | IL | 4A | CCL (Purple) |
| Maroa-Forsyth | IL | 2A | Sangamo |
| Marshall | IL | 2A | Little Illini |
| Mascoutah | IL | 5A | Southwestern (Black) |
| Massac County | IL | 3A | Southern Illinois River-to-River (Ohio) |
| Mater Dei | IL | 3A | Metro-Valley |
| Mather | IL | 6A | Chicago Public, Red North |
| Mattoon | IL | — | Apollo |
| McHenry | IL | 7A | Fox Valley |
| McNamara | IL | 3A | Chicagoland Christian |
| Mendota | IL | 3A | Three Rivers (Mississippi) |
| Mercer County | IL | — | Three Rivers (Rock) |
| Metamora | IL | 4A | Mid-Illini |
| Metea Valley | IL | 8A | DuPage Valley |
| Minooka | IL | 8A | Southwest Prairie (West) |
| Moline | IL | 7A | Western Big 6 |
| Momence | IL | 1A | Vermilion Valley |
| Monmouth-Roseville | IL | 3A | Three Rivers (Mississippi) |
| Monmouth United | IL | 1A | LincolnLand (South) |
| Monticello | IL | 3A | Illini Prairie |
| Montini | IL | 4A | CCL (Green) |
| Morgan Park | IL | 5A | Chicago Public, Red Star |
| Morris | IL | 4A | Interstate 8 |
| Morrison | IL | 1A | Northwest Upstate Illini |
| Morton | IL | 5A | Mid-Illini |
| Mount Carmel | IL | 8A | CCL (Blue) |
| Mt Carmel | IL | 3A | Little Illini |
| Mt Vernon | IL | 5A | South Seven |
| Mt Zion | IL | 4A | Apollo |
| Muchin | IL | 6A | Chicago Public, Red North |
| Mundelein | IL | 7A | North Suburban |
| Murphysboro | IL | — | Southern Illinois River-to-River (Ohio) |
| Naperville Central | IL | 8A | DuPage Valley |
| Naperville North | IL | 8A | DuPage Valley |
| Nashville | IL | 2A | Southern Illinois River-to-River (Mississippi) |
| Nazareth Academy | IL | 6A | CCL (Green) |
| Neuqua Valley | IL | 8A | DuPage Valley |
| New Berlin | IL | — | Sangamo |
| Newman Central Cath | IL | 1A | Three Rivers (Rock) |
| Newton | IL | — | Little Illini |
| New Trier | IL | 8A | Central Suburban (South) |
| Niles North | IL | 7A | Central Suburban (North) |
| Niles Notre Dame | IL | 6A | CCL (Purple) |
| Niles West | IL | — | Central Suburban (Central) |
| Noble Academy | IL | — | Chicago Public, White North |
| Noble Street | IL | — | Chicago Public, Blue North |
| Nokomis | IL | 1A | Lincoln Prairie |
| Normal Community | IL | 7A | Big Twelve |
| Normal University | IL | 5A | Central State Eight (East) |
| Normal West | IL | 6A | Big Twelve |
| North Boone | IL | 3A | Big Northern |
| North Chicago | IL | 4A | Northern Lake County |
| North Grand | IL | — | — |
| North Greene | IL | — | Western Illinois Valley (South) |
| North Lawndale | IL | 4A | Chicago Public, Red West |
| North Mac | IL | — | South Central |
| Oak Forest | IL | 5A | South Suburban (Blue) |
| Oak Lawn | IL | 6A | South Suburban (Red) |
| Oak Lawn Richards | IL | 7A | South Suburban (Red) |
| Oak Pk-River Forest | IL | 8A | West Suburban (Silver) |
| Oakwood | IL | 1A | Vermilion Valley |
| O'Fallon | IL | 8A | Southwestern (Gold) |
| Okaw Valley | IL | — | — |
| Olympia | IL | 3A | Sangamo |
| Oregon | IL | 2A | Big Northern |
| Orion | IL | 1A | Three Rivers (Rock) |
| Orr | IL | 1A | Chicago Public, White Central |
| Oswego | IL | 8A | Southwest Prairie (West) |
| Oswego East | IL | 8A | Southwest Prairie (West) |
| Ottawa | IL | — | Interstate 8 |
| Ottawa Marquette | IL | 1A | Chicagoland Prairie |
| Palatine | IL | 7A | Mid-Suburban (West) |
| Pana | IL | 2A | South Central |
| Paris | IL | 3A | Little Illini |
| Paxton-Buckley-Loda | IL | — | Illini Prairie |
| Payton | IL | 5A | Chicago Public, Red Star |
| Pekin | IL | 6A | Mid-Illini |
| Peoria | IL | 5A | Big Twelve |
| Peoria Notre Dame | IL | 4A | Big Twelve |
| Peotone | IL | — | Illinois Central Eight |
| Perspectives | IL | 8A | Chicago Public, Red Southwest |
| Phillips | IL | — | Chicago Public, Red Star |
| Phoenix | IL | — | Chicago Public, White West |
| Piasa Southwestern | IL | 2A | South Central |
| Pinckneyville | IL | — | Southern Illinois River-to-River (Mississippi) |
| Pittsfield | IL | — | Sangamo |
| Plainfield Central | IL | — | Southwest Prairie (East) |
| Plainfield East | IL | 6A | Southwest Prairie (East) |
| Plainfield North | IL | — | Southwest Prairie (West) |
| Plainfield South | IL | — | Southwest Prairie (East) |
| Plano | IL | 4A | Kishwaukee River |
| Pleasant Hill | IL | 1A | Western Illinois Valley (South) |
| Pleasant Plains | IL | 2A | Sangamo |
| Pontiac | IL | 3A | Illini Prairie |
| PORTA | IL | 3A | Sangamo |
| Prairie Central | IL | 3A | Illini Prairie |
| Prairie Ridge | IL | 5A | Fox Valley |
| Princeton | IL | 3A | Three Rivers (Mississippi) |
| Princeville | IL | 1A | LincolnLand (North) |
| Pritzker | IL | — | Chicago Public, Blue North |
| Prospect | IL | 7A | Mid-Suburban (East) |
| Prosser | IL | 7A | Chicago Public, Red North |
| Providence Catholic | IL | 5A | CCL (Orange) |
| Proviso East | IL | — | West Suburban (Gold) |
| Proviso West | IL | — | West Suburban (Silver) |
| Quincy | IL | 6A | Western Big 6 |
| Quincy Notre Dame | IL | 4A | Central State Eight (West) |
| Rantoul | IL | — | Illini Prairie |
| Rauner | IL | 3A | Chicago Public, White West |
| Reavis | IL | 7A | South Suburban (Red) |
| Red Bud | IL | — | Cahokia (Illinois) |
| Red Hill | IL | 1A | Black Diamond |
| Reed-Custer | IL | 2A | Illinois Central Eight |
| Richland County | IL | 4A | Little Illini |
| Richmond-Burton | IL | 3A | Kishwaukee River |
| Rich Township | IL | 7A | Southland |
| Richwoods | IL | 6A | Big Twelve |
| Ridgeview-Lexington | IL | 2A | Heart of Central Illinois (Large) |
| Ridgewood | IL | — | UpState 8 (East) |
| Riverdale | IL | 2A | Three Rivers (Rock) |
| Riverside-Brookfield | IL | 6A | UpState 8 (East) |
| Riverton | IL | 2A | Sangamo |
| Robinson | IL | 3A | Little Illini |
| Rochelle | IL | 4A | Interstate 8 |
| Rochester | IL | 4A | Central State Eight (East) |
| Rock Falls | IL | — | Big Northern |
| Rockford Auburn | IL | — | Northern Illinois (NIC 10) |
| Rockford Christian | IL | — | 8-Player - North East |
| Rockford East | IL | 6A | Northern Illinois (NIC 10) |
| Rockford Lutheran | IL | — | Big Northern |
| Rock Island | IL | — | Western Big 6 |
| Rockridge | IL | 2A | Three Rivers (Rock) |
| Rolling Meadows | IL | 6A | Mid-Suburban (East) |
| Romeoville | IL | — | Southwest Prairie (East) |
| Round Lake | IL | — | Northern Lake County |
| Routt | IL | 2A | Western Illinois Valley (North) |
| Rowe-Clark | IL | — | Chicago Public, Blue West |
| ROWVA | IL | — | LincolnLand (North) |
| Roxana | IL | 3A | Metro-Valley |
| Rushville-Industry | IL | 1A | LincolnLand (South) |
| Sacred Heart-Griffin | IL | 4A | Central State Eight (West) |
| Salem | IL | 4A | Southern Illinois River-to-River (Ohio) |
| Salt Fork | IL | 1A | Vermilion Valley |
| Sandburg | IL | 8A | Southwest Suburban |
| Sandwich | IL | 3A | Kishwaukee River |
| Sangamon Valley | IL | 2A | Lincoln Prairie |
| Schaumburg | IL | — | Mid-Suburban (West) |
| Schurz | IL | — | Chicago Public, White North |
| Seneca | IL | 2A | Chicagoland Prairie |
| Senn | IL | 5A | Chicago Public, White Central |
| Sesser-Valier | IL | 1A | Black Diamond |
| Shelbyville | IL | 2A | Heart of Central Illinois (Large) |
| Shepard | IL | 6A | South Suburban (Red) |
| Sherrard | IL | — | Three Rivers (Mississippi) |
| Simeon | IL | 6A | Chicago Public, Red Star |
| Solorio Academy | IL | — | Chicago Public, White West |
| South Elgin | IL | 8A | UpState 8 (West) |
| South Fulton | IL | 1A | LincolnLand (South) |
| South Shore Interntl | IL | 3A | Chicago Public, Red South |
| Sparta | IL | 3A | Cahokia (Illinois) |
| Springfield | IL | 5A | Central State Eight (West) |
| Springfield Southeast | IL | — | Central State Eight (West) |
| Stagg | IL | — | Southwest Suburban |
| Stark County | IL | 1A | LincolnLand (North) |
| Staunton | IL | 3A | South Central |
| St. Bede | IL | — | Chicagoland Prairie |
| St. Charles East | IL | 6A | DuKane |
| St. Charles North | IL | 7A | DuKane |
| St. Edward | IL | — | Chicagoland Christian |
| Steinmetz | IL | — | Chicago Public, Blue North |
| Sterling | IL | 4A | Western Big 6 |
| Stevenson | IL | 8A | North Suburban |
| St. Francis | IL | 5A | CCL (Green) |
| St. Ignatius | IL | — | CCL (Orange) |
| Stillman Valley | IL | 2A | Big Northern |
| St. Joseph-Ogden | IL | 3A | Illini Prairie |
| St. Laurence | IL | 7A | CCL (White) |
| Stockton | IL | 1A | Northwest Upstate Illini |
| St. Patrick | IL | 7A | CCL (Purple) |
| Streamwood | IL | 6A | UpState 8 (West) |
| Streator | IL | — | Illinois Central Eight |
| St. Rita | IL | 7A | CCL (Green) |
| St. Teresa | IL | 2A | Independent Schools |
| St. Viator | IL | — | CCL (Red) |
| Sullivan | IL | 2A | Lincoln Prairie |
| Sycamore | IL | 5A | Interstate 8 |
| Taft | IL | 8A | Chicago Public, Red Star |
| Taylorville | IL | 4A | Apollo |
| T F North | IL | 5A | South Suburban (Blue) |
| T F South | IL | 6A | South Suburban (Blue) |
| Thornridge | IL | — | Southland |
| Thornton | IL | 6A | Southland |
| Thornwood | IL | 6A | Southland |
| Tinley Park | IL | 4A | South Suburban (Blue) |
| Tolono Unity | IL | 3A | Illini Prairie |
| Tremont | IL | 1A | Heart of Central Illinois (Small) |
| Triad | IL | — | Southwestern (Black) |
| Tri-County | IL | — | Lincoln Prairie |
| Triopia | IL | 1A | Western Illinois Valley (North) |
| Tri-Valley | IL | 2A | Heart of Central Illinois (Large) |
| Tuscola | IL | 1A | Heart of Central Illinois (Small) |
| UIC | IL | 6A | Chicago Public, Red West |
| Unity-Payson | IL | — | Western Illinois Valley (North) |
| Uplift | IL | — | Chicago Public, Blue North |
| Urbana | IL | — | Big Twelve |
| Urban Prep Bronzeville | IL | 4A | Chicago Public, Red North |
| Vandalia | IL | 3A | South Central |
| Vernon Hills | IL | 5A | Central Suburban (North) |
| Vienna-Goreville | IL | — | Independent Schools |
| Villa Grove | IL | 1A | Lincoln Prairie |
| Von Steuben | IL | — | Chicago Public, White North |
| Walther Christian | IL | — | Independent Schools |
| Warren | IL | 8A | North Suburban |
| Warrensburg-Latham | IL | 2A | Heart of Central Illinois (Large) |
| Warrenville South | IL | 6A | DuKane |
| Washington | IL | 5A | Mid-Illini |
| Waterloo | IL | 4A | Cahokia (Mississippi) |
| Watseka | IL | — | Vermilion Valley |
| Waubonsie Valley | IL | 8A | DuPage Valley |
| Wauconda | IL | 5A | Northern Lake County |