| A-C Central High School | Ashland | Illinois Valley | 2021 |
| Abingdon-Avon High School | Abingdon | Hopewell | 2021 |
| Altamont High School | Altamont | Eastern | 2021 |
| Alton Senior High School | Alton | Kaskaskia | 2021 |
| Amboy High School | Amboy | Northwest | 2021 |
| Argo Community High School | Summit | Northeast | 2021 |
| Armstrong High School | Armstrong | Kickapoo | 2021 |
| Arthur-Lovington-Atwood-Hammond High School | Arthur | Kickapoo | 2021 |
| Beecher High School | Beecher | Northeast | 2021 |
| Belleville East High School | Belleville | Kaskaskia | 2021 |
| Belleville West High School | Belleville | Kaskaskia | 2021 |
| Belvidere High School | Belvidere | North Central | 2021 |
| Belvidere North High School | Belvidere | North Central | 2021 |
| Benton High School | Benton | Little Egypt | 2021 |
| Bloomington High School | Bloomington | Cenois | 2021 |
| Blue Ridge High School | Farmer City | Cenois | 2021 |
| Bradley-Bourbonnais High School | Bradley | Prairie 8 | 2021 |
| Brother Rice High School | Chicago | Chicago | 2021 |
| Byron High School | Byron | Northwest | 2021 |
| Capital Area Career Center | Springfield | Cenois | 2021 |
| Carbondale High School | Carbondale | Little Egypt | 2021 |
| Carmi-White County High School | Carmi | Little Egypt | 2021 |
| Carrier Mills-Stonefort High School | Carrier Mills | Little Egypt | 2021 |
| Carterville High School | Carterville | Little Egypt | 2021 |
| Catalyst Maria High School | Chicago | Chicago | 2021 |
| Century High School | Ullin | Little Egypt | 2021 |
| Charleston High School | Charleston | Eastern | 2021 |
| Chester High School | Chester | Little Egypt | 2021 |
| Chicago Collegiate Charter High School | Chicago | Chicago | 2021 |
| Cisne High School | Cisne | Eastern | 2021 |
| Civic Memorial High School | Bethalto | Kaskaskia | 2021 |
| Clay City High School | Clay City | Eastern | 2021 |
| Clifton Central High School | Clifton | Prairie 8 | 2021 |
| Cobden High School | Cobden | Little Egypt | 2021 |
| Collinsville High School | Collinsville | Kaskaskia | 2021 |
| Columbia High School | Columbia | Kaskaskia | 2021 |
| Crete-Monee High School | Crete | Prairie 8 | 2021 |
| Cumberland High School | Toledo | Eastern | 2021 |
| Curie Metropolitan High School | Chicago | Chicago | 2021 |
| Danville High School | Danville | Kickapoo | 2021 |
| DeKalb High School | DeKalb | North Central | 2021 |
| Delavan High School | Delavan | Hopewell | 2021 |
| Donovan High School | Donovan | Prairie 8 | 2021 |
| Dupo High School | Dupo | Kaskaskia | 2021 |
| DuQuoin High School | DuQuoin | Little Egypt | 2021 |
| Dwight High School | Dwight | Prairie 8 | 2021 |
| East Alton-Wood River High School | Wood River | Kaskaskia | 2021 |
| Eastland High School | Lanark | Northwest | 2021 |
| Edwards County High School | Albion | Eastern | 2021 |
| Edwardsville High School | Edwardsville | Kaskaskia | 2021 |
| Eisenhower High School | Decatur | Cenois | 2021 |
| Eldorado High School | Eldorado | Little Egypt | 2021 |
| Elk Grove High School | Elk Grove Village | Northeast | 2021 |
| Elmwood High School | Elmwood | Hopewell | 2021 |
| Elverado High School | Elkville | Little Egypt | 2021 |
| Evanston Township High School | Evanston | Northeast | 2021 |
| Fairfield Community High School | Fairfield | Eastern | 2021 |
| Fieldcrest High School | Minonk | Hopewell | 2021 |
| First Baptist Academy | O'Fallon | Kaskaskia | 2021 |
| Flora High School | Flora | Eastern | 2021 |
| Foreman High School | Chicago | Chicago | 2021 |
| Freeburg High School | Freeburg | Kaskaskia | 2021 |
| Galatia High School | Galatia | Little Egypt | 2021 |
| Gallatin County High School | Junction | Little Egypt | 2021 |
| Geneseo High School | Geneseo | Blackhawk | 2021 |
| Gibault Catholic High School | Waterloo | Kaskaskia | 2021 |
| Glenbrook North High School | Northbrook | Northeast | 2021 |
| Glenbrook South High School | Glenview | Northeast | 2021 |
| Glenwood High School | Chatham | Cenois | 2021 |
| Goreville High School | Goreville | Little Egypt | 2021 |
| Granite City High School | Granite City | Kaskaskia | 2021 |
| Grayslake North High School | Grayslake | Northeast | 2021 |
| Greenville High School | Greenville | Kaskaskia | 2021 |
| Henry-Senachwine High School | Henry | Hopewell | 2021 |
| Heritage High School | Broadlands | Kickapoo | 2021 |
| Herrin High School | Herrin | Little Egypt | 2021 |
| Herscher High School | Herscher | Prairie 8 | 2021 |
| Highland High School | Highland | Kaskaskia | 2021 |
| Hoffman Estates High School | Hoffman Estates | Northeast | 2021 |
| Homewood-Flossmoor High School | Flossmoor | Northeast | 2021 |
| Hononegah High School | Rockton | North Central | 2021 |
| Huntley High School | Huntley | North Central | 2021 |
| Hutsonville High School | Hutsonville | Eastern | 2021 |
| Illini Bluffs High School | Glasford | Hopewell | 2021 |
| Illini Central High School | Mason City | Hopewell | 2021 |
| Illinois School for the Visually Impaired | Jacksonville | Illinois Valley | 2021 |
| Illinois Valley Central High School | Chillicothe | Hopewell | 2021 |
| Indian Creek High School | Shabbona | North Central | 2021 |
| Iroquois West High School | Gilman | Prairie 8 | 2021 |
| John Hancock College Prep | Chicago | Chicago | 2021 |
| Johnsburg High School | Johnsburg | North Central | 2021 |
| Johnston City High School | Johnston City | Little Egypt | 2021 |
| Joliet Catholic Academy | Joliet | Prairie 8 | 2021 |
| Joliet Central High School | Joliet | Prairie 8 | 2021 |
| Jones College Prep | Chicago | Chicago | 2021 |
| Judah Christian High School | Champaign | Kickapoo | 2021 |
| Keith Country Day School | Rockford | North Central | 2021 |
| Kelly High School | Chicago | Chicago | 2021 |
| Kewanee High School | Kewanee | Blackhawk | 2021 |
| Lake Park High School | Roselle | Northeast | 2021 |
| Larkin High School | Elgin | North Central | 2021 |
| Lena-Winslow High School | Lena | Northwest | 2021 |
| Leo High School | Chicago | Chicago | 2021 |
| Leyden High School | Franklin Park | Northeast | 2021 |
| Lowpoint-Washburn High School | Washburn | Hopewell | 2021 |
| Loyola Academy | Wilmette | Northeast | 2021 |
| Lyons Township High School | LaGrange | Northeast | 2021 |
| Madison High School | Madison | Kaskaskia | 2021 |
| Mahomet-Seymour High School | Mahomet | Kickapoo | 2021 |
| Marion High School | Marion | Little Egypt | 2021 |
| Mascoutah High School | Mascoutah | Kaskaskia | 2021 |
| Mattoon High School | Mattoon | Eastern | 2021 |
| Mendota High School | Mendota | Prairie 8 | 2021 |
| Meredosia-Chambersburg High School | Meredosia | Illinois Valley | 2021 |
| Meridian High School | Mounds | Hopewell | 2021 |
| Midland High School | Varna | Hopewell | 2021 |
| Midwest Central High School | Manito | Hopewell | 2021 |
| Minooka Community High School | Minooka | Prairie 8 | 2021 |
| Momence High School | Momence | Prairie 8 | 2021 |
| Monmouth-Roseville High School | Monmouth | Blackhawk | 2021 |
| Morrison High School | Morrison | Northwest | 2021 |
| Morrisonville High School | Morrisonville | Cenois | 2021 |
| Morton High School | Morton | Hopewell | 2021 |
| Mt. Vernon High School | Mt. Vernon | Little Egypt | 2021 |
| Murphysboro High School | Murphysboro | Little Egypt | 2021 |
| New Trier High School | Winnetka | Northeast | 2021 |
| Newark High School | Newark | Prairie 8 | 2021 |
| Newton High School | Newton | Eastern | 2021 |
| Normal West High School | Normal | Cenois | 2021 |
| North Lawndale College Prep High School | Chicago | Chicago | 2021 |
| O'Fallon High School | O'Fallon | Kaskaskia | 2021 |
| Oakwood High School | Fithian | Kickapoo | 2021 |
| Odin High School | Odin | Kaskaskia | 2021 |
| Okawville High School | Okawville | Kaskaskia | 2021 |
| Olympia High School | Stanford | Cenois | 2021 |
| Oregon High School | Oregon | Northwest | 2021 |
| Oswego High School | Oswego | North Central | 2021 |
| Ottawa Township High School | Ottawa | Prairie 8 | 2021 |
| Pawnee High School | Pawnee | Cenois | 2021 |
| Paxton-Buckley-Loda High School | Paxton | Kickapoo | 2021 |
| Pekin High School | Pekin | Hopewell | 2021 |
| Peoria High School | Peoria | Hopewell | 2021 |
| Peotone High School | Peotone | Prairie 8 | 2021 |
| Pinckneyville High School | Pinckneyville | Little Egypt | 2021 |
| Plainfield North High School | Plainfield | Prairie 8 | 2021 |
| PORTA High School | Petersburg | Illinois Valley | 2021 |
| Princeton High School | Princeton | Blackhawk | 2021 |
| Proviso East High School | Maywood | Northeast | 2021 |
| Putnam County High School | Granville | Hopewell | 2021 |
| Quincy Senior High School | Quincy | Illinois Valley | 2021 |
| Ramsey High School | Ramsey | Eastern | 2021 |
| Rantoul High School | Rantoul | Kickapoo | 2021 |
| Richards High School | Oak Lawn | Northeast | 2021 |
| Richmond-Burton High School | Richmond | North Central | 2021 |
| Ridgewood High School | Norridge | Northeast | 2021 |
| Riverton High School | Riverton | Cenois | 2021 |
| Rochelle High School | Rochelle | Northwest | 2021 |
| Roxana High School | Roxana | Kaskaskia | 2021 |
| Roycemore High School | Evanston | Northeast | 2021 |
| Sandburg High School | Orland Park | Northeast | 2021 |
| Sangamon Valley High School | Niantic | Cenois | 2021 |
| Serena High School | Serena | North Central | 2021 |
| Shelbyville High School | Shelbyville | Eastern | 2021 |
| Shiloh High School | Hume | Kickapoo | 2021 |
| South Central High School | Farina | Eastern | 2021 |
| South Fork High School | Kincaid | Eastern | 2021 |
| Sparta High School | Sparta | Kaskaskia | 2021 |
| St. Anne Community High School | St. Anne | Prairie 8 | 2021 |
| St. Charles North High School | St. Charles | North Central | 2021 |
| St. Francis de Sales High School | Chicago | Chicago | 2021 |
| St. Ignatius College Prep | Chicago | Chicago | 2021 |
| St. Joseph-Ogden High School | St. Joseph | Kickapoo | 2021 |
| St. Rita of Cascia High School | Chicago | Chicago | 2021 |
| St. Viator High School | Arlington Heights | Northeast | 2021 |
| Sterling High School | Sterling | Northwest | 2021 |
| Stevenson High School | Lincolnshire | Northeast | 2021 |
| Stillman Valley High School | Stillman Valley | Northwest | 2021 |
| Sullivan High School | Sullivan | Eastern | 2021 |
| Taylorville High School | Taylorville | Cenois | 2021 |
| Teutopolis High School | Teutopolis | Eastern | 2021 |
| Tremont High School | Tremont | Hopewell | 2021 |
| Tri-Point High School | Cullom | Prairie 8 | 2021 |
| Triad High School | Troy | Kaskaskia | 2021 |
| Trico High School | Campbell Hill | Little Egypt | 2021 |
| Trinity Oaks Christian Academy | Cary | Northeast | 2021 |
| Tuscola High School | Tuscola | Kickapoo | 2021 |
| United High School | Monmouth | Blackhawk | 2021 |
| United Township High School | East Moline | Blackhawk | 2021 |
| Unity High School | Tolono | Kickapoo | 2021 |
| Villa Grove High School | Villa Grove | Kickapoo | 2021 |
| Waltonville High School | Waltonville | Little Egypt | 2021 |
| Waterloo High School | Waterloo | Kaskaskia | 2021 |
| Wesclin High School | Trenton | Kaskaskia | 2021 |
| West Carroll High School | Savanna | Northwest | 2021 |
| Wethersfield High School | Kewanee | Blackhawk | 2021 |
| Willowbrook High School | Villa Park | Northeast | 2021 |
| Wilmington High School | Wilmington | Prairie 8 | 2021 |
| Winchester High School | Winchester | Illinois Valley | 2021 |
| Windsor High School | Windsor | Eastern | 2021 |
| Wolcott School | Chicago | Chicago | 2021 |
| Woodstock North High School | Woodstock | North Central | 2021 |
| York High School | Elmhurst | Northeast | 2021 |