| | | | 2020 |
| A-C Central High School | Ashland | Illinois Valley | 2023 |
| Abingdon-Avon High School | Abingdon | Hopewell | 2024 |
| Addison Trail High School | Addison | Northeast | 2024 |
| Agape Christian High School | Carterville | Little Egypt | 2018 |
| Altamont High School | Altamont | Eastern | 2024 |
| Althoff Catholic High School | Belleville | Kaskaskia | 2013 |
| Alton Senior High School | Alton | Kaskaskia | 2024 |
| Amboy High School | Amboy | Northwest | 2024 |
| Andrew High School | Tinley Park | Northeast | 2024 |
| Antioch High School | Antioch | Northeast | 2024 |
| Arcola High School | Arcola | Kickapoo | 2016 |
| Argenta-Oreana High School | Argenta | Cenois | 2019 |
| Argo Community High School | Summit | Northeast | 2024 |
| Armstrong High School | Armstrong | Kickapoo | 2024 |
| Arthur-Lovington-Atwood-Hammond High School | Arthur | Kickapoo | 2024 |
| Astoria High School | Astoria | Illinois Valley | 2018 |
| Auburn High School | Auburn | Cenois | 2018 |
| Auburn High School | Rockford | North Central | 2024 |
| Aurora West High School | Aurora | North Central | 2017 |
| Bartlett High School | Bartlett | Northeast | 2015 |
| Batavia High School | Batavia | North Central | 2020 |
| Beardstown High School | Beardstown | Illinois Valley | 2011 |
| Beecher High School | Beecher | Northeast | 2024 |
| Belleville East High School | Belleville | Kaskaskia | 2024 |
| Belleville West High School | Belleville | Kaskaskia | 2024 |
| Belvidere High School | Belvidere | North Central | 2024 |
| Belvidere North High School | Belvidere | North Central | 2024 |
| Bement High School | Bement | Kickapoo | 2019 |
| Benet Academy | Lisle | Northeast | 2016 |
| Benton High School | Benton | Little Egypt | 2024 |
| Bismarck-Henning Rossville-Alvin Cooperative High School | Bismarck | Kickapoo | 2018 |
| Bloom High School | Chicago Heights | Northeast | 2024 |
| Bloomington High School | Bloomington | Cenois | 2021 |
| Blue Ridge High School | Farmer City | Cenois | 2024 |
| Bluffs High School | Bluffs | Illinois Valley | 2016 |
| Bogan High School | Chicago | Chicago | 2017 |
| Bradley-Bourbonnais High School | Bradley | Prairie 8 | 2024 |
| Brother Rice High School | Chicago | Chicago | 2022 |
| Brown County High School | Mt. Sterling | Illinois Valley | 2024 |
| Brownstown High School | Brownstown | Eastern | 2023 |
| Bunker Hill High School | Bunker Hill | Kaskaskia | 2024 |
| Bushnell-Prairie City High School | Bushnell | Illinois Valley | 2014 |
| Byron High School | Byron | Northwest | 2024 |
| Cahokia High School | Cahokia | Kaskaskia | 2014 |
| Calhoun High School | Hardin | Kaskaskia | 2024 |
| Cambridge High School | Cambridge | Blackhawk | 2024 |
| Canton High School | Canton | Illinois Valley | 2020 |
| Capital Area Career Center | Springfield | Cenois | 2024 |
| Carbondale High School | Carbondale | Little Egypt | 2024 |
| Carlinville High School | Carlinville | Kaskaskia | 2013 |
| Carlyle High School | Carlyle | Kaskaskia | 2024 |
| Carmi-White County High School | Carmi | Little Egypt | 2024 |
| Carrier Mills-Stonefort High School | Carrier Mills | Little Egypt | 2024 |
| Carterville High School | Carterville | Little Egypt | 2024 |
| Casey-Westfield High School | Casey | Eastern | 2024 |
| Catalyst Maria High School | Chicago | Chicago | 2021 |
| Centennial High School | Champaign | Kickapoo | 2024 |
| Central A & M High School | Moweaqua | Eastern | 2023 |
| Central Catholic High School | Bloomington | Cenois | 2013 |
| Central High School | Burlington | North Central | 2024 |
| Central High School | Camp Point | Illinois Valley | 2016 |
| Centralia High School | Centralia | Kaskaskia | 2024 |
| Century High School | Ullin | Little Egypt | 2021 |
| Cerro Gordo High School | Cerro Gordo | Cenois | 2024 |
| Chadwick-Milledgeville High School | Milledgeville | Northwest | 2023 |
| Champaign Central High School | Champaign | Kickapoo | 2024 |
| Charleston High School | Charleston | Eastern | 2024 |
| Chester High School | Chester | Little Egypt | 2024 |
| Chicago Academy High School | Chicago | Chicago | 2017 |
| Chicago Collegiate Charter High School | Chicago | Chicago | 2021 |
| Chicago International Charter School - Longwood | Chicago | Chicago | 2016 |
| Christopher High School | Christopher | Little Egypt | 2018 |
| Cisne High School | Cisne | Eastern | 2024 |
| Civic Memorial High School | Bethalto | Kaskaskia | 2024 |
| Clay City High School | Clay City | Eastern | 2024 |
| Clifton Central High School | Clifton | Prairie 8 | 2024 |
| Clinton High School | Clinton | Cenois | 2018 |
| Coal City High School | Coal City | Prairie 8 | 2022 |
| Cobden High School | Cobden | Little Egypt | 2024 |
| Collinsville High School | Collinsville | Kaskaskia | 2024 |
| Columbia High School | Columbia | Kaskaskia | 2024 |
| Coulterville High School | Coulterville | Little Egypt | 2024 |
| Crab Orchard High School | Marion | Little Egypt | 2024 |
| Crete-Monee High School | Crete | Prairie 8 | 2024 |
| Crystal Lake Central High School | Crystal Lake | North Central | 2024 |
| Cumberland High School | Toledo | Eastern | 2024 |
| Curie Metropolitan High School | Chicago | Chicago | 2021 |
| Dakota High School | Dakota | Northwest | 2024 |
| Daniel Hale Williams Prep School of Medicine | Chicago | Chicago | 2014 |
| Danville High School | Danville | Kickapoo | 2023 |
| De La Salle Institute | Chicago | Chicago | 2013 |
| Decatur Christian School | Forsyth | Cenois | 2014 |
| Deer Creek-Mackinaw High School | Mackinaw | Hopewell | 2024 |
| DeKalb High School | DeKalb | North Central | 2024 |
| DeLand-Weldon High School | DeLand | Kickapoo | 2023 |
| Delavan High School | Delavan | Hopewell | 2024 |
| DePue High School | DePue | Blackhawk | 2018 |
| Dongola High School | Dongola | Little Egypt | 2012 |
| Donovan High School | Donovan | Prairie 8 | 2024 |
| Downers Grove South High School | Downers Grove | Northeast | 2017 |
| Dundee-Crown High School | Carpentersville | North Central | 2015 |
| Dunlap High School | Dunlap | Hopewell | 2022 |
| Dupo High School | Dupo | Kaskaskia | 2024 |
| DuQuoin High School | DuQuoin | Little Egypt | 2024 |
| Dwight High School | Dwight | Prairie 8 | 2024 |
| Earlville High School | Earlville | Prairie 8 | 2015 |
| East Alton-Wood River High School | Wood River | Kaskaskia | 2024 |
| East Peoria High School | East Peoria | Hopewell | 2017 |
| East St. Louis Senior High School | East St. Louis | Kaskaskia | 2017 |
| Eastland Jr./Sr. High School | Lanark | Northwest | 2024 |
| Edinburg High School | Edinburg | Eastern | 2024 |
| Edwards County High School | Albion | Eastern | 2021 |
| Edwardsville High School | Edwardsville | Kaskaskia | 2023 |
| Effingham High School | Effingham | Eastern | 2024 |
| Eisenhower High School | Blue Island | Northeast | 2024 |
| Eisenhower High School | Decatur | Cenois | 2021 |
| Eldorado High School | Eldorado | Little Egypt | 2024 |
| Elk Grove High School | Elk Grove Village | Northeast | 2021 |
| Elmwood High School | Elmwood | Hopewell | 2024 |
| Elmwood Park High School | Elmwood Park | Northeast | 2024 |
| Elverado High School | Elkville | Little Egypt | 2023 |
| EPIC Academy | Chicago | Chicago | 2023 |
| Eureka High School | Eureka | Hopewell | 2024 |
| Evanston Township High School | Evanston | Northeast | 2023 |
| Evergreen Park High School | Evergreen Park | Northeast | 2024 |
| Fairfield Community High School | Fairfield | Eastern | 2024 |
| Farragut High School | Chicago | Chicago | 2014 |
| Fenton High School | Bensenville | Northeast | 2024 |
| Fenwick High School | Oak Park | Northeast | 2015 |
| Fieldcrest High School | Minonk | Hopewell | 2024 |
| First Baptist Academy | O'Fallon | Kaskaskia | 2021 |
| Fisher High School | Fisher | Kickapoo | 2022 |
| Flanagan-Cornell High School | Flanagan | Prairie 8 | 2017 |
| Flora High School | Flora | Eastern | 2021 |
| Foreman High School | Chicago | Chicago | 2021 |
| Forreston High School | Forreston | Northwest | 2011 |
| Freeburg High School | Freeburg | Kaskaskia | 2024 |
| Freeport High School | Freeport | Northwest | 2020 |
| Fremd High School | Palatine | Northeast | 2023 |
| Fulton High School | Fulton | Northwest | 2023 |
| Galatia High School | Galatia | Little Egypt | 2022 |
| Galena High School | Galena | Northwest | 2018 |
| Galesburg High School | Galesburg | Hopewell | 2017 |
| Gallatin County High School | Junction | Little Egypt | 2024 |
| Galva High School | Galva | Hopewell | 2017 |
| Geneseo High School | Geneseo | Blackhawk | 2024 |
| Geneva High School | Geneva | North Central | 2016 |
| Genoa-Kingston High School | Genoa | North Central | 2024 |
| Georgetown-Ridge Farm High School | Georgetown | Kickapoo | 2024 |
| Gibault Catholic High School | Waterloo | Kaskaskia | 2024 |
| Gillespie High School | Gillespie | Kaskaskia | 2024 |
| Glenbard East High School | Lombard | Northeast | 2024 |
| Glenbard North High School | Carol Stream | Northeast | 2016 |
| Glenbard South High School | Glen Ellyn | Northeast | 2023 |
| Glenbard West High School | Glen Ellyn | Northeast | 2015 |
| Glenbrook North High School | Northbrook | Northeast | 2024 |
| Glenbrook South High School | Glenview | Northeast | 2021 |
| Glenwood High School | Chatham | Cenois | 2024 |
| Goreville High School | Goreville | Little Egypt | 2022 |
| Governor French Academy | Belleville | Kaskaskia | 2019 |
| Granite City High School | Granite City | Kaskaskia | 2024 |
| Grayslake North High School | Grayslake | Northeast | 2024 |
| Greenfield High School | Greenfield | Kaskaskia | 2015 |
| Greenville High School | Greenville | Kaskaskia | 2024 |
| Guilford High School | Rockford | North Central | 2024 |
| H.D. Jacobs High School | Algonquin | North Central | 2024 |
| Hamilton County High School | McLeansboro | Little Egypt | 2024 |
| Hardin County High School | Elizabethtown | Little Egypt | 2024 |
| Harlan Community Academy | Chicago | Chicago | 2014 |
| Harrisburg High School | Harrisburg | Little Egypt | 2024 |
| Hartsburg-Emden High School | Hartsburg | Cenois | 2023 |
| Henry-Senachwine High School | Henry | Hopewell | 2021 |
| Heritage High School | Broadlands | Kickapoo | 2024 |
| Herrin High School | Herrin | Little Egypt | 2024 |
| Herscher High School | Herscher | Prairie 8 | 2024 |
| Hersey High School | Arlington Heights | Northeast | 2018 |
| Heyworth High School | Heyworth | Cenois | 2023 |
| Hiawatha High School | Kirkland | North Central | 2012 |
| Highland High School | Highland | Kaskaskia | 2024 |
| Hillcrest High School | Country Club Hills | Northeast | 2024 |
| Hillsboro High School | Hillsboro | Eastern | 2023 |
| Hinckley-Big Rock High School | Hinckley | North Central | 2011 |
| Hinsdale Central High School | Hinsdale | Northeast | 2014 |
| Hinsdale South High School | Darien | Northeast | 2016 |
| Hoffman Estates High School | Hoffman Estates | Northeast | 2023 |
| Holy Trinity High School | Chicago | Chicago | 2022 |
| Homewood-Flossmoor High School | Flossmoor | Northeast | 2024 |
| Hononegah High School | Rockton | North Central | 2024 |
| Hoopeston Area High School | Hoopeston | Kickapoo | 2024 |
| Horizon Science Academy - McKinley | Chicago | Chicago | 2022 |
| Huntley High School | Huntley | North Central | 2024 |
| Hutsonville High School | Hutsonville | Eastern | 2024 |
| Illini Bluffs High School | Glasford | Hopewell | 2024 |
| Illini Central High School | Mason City | Hopewell | 2024 |
| Illinois Math and Science Academy | Aurora | North Central | 2024 |
| Illinois School for the Visually Impaired | Jacksonville | Illinois Valley | 2024 |
| Illinois Valley Central High School | Chillicothe | Hopewell | 2024 |
| Indian Creek High School | Shabbona | North Central | 2024 |
| Intrinsic Schools | Chicago | Chicago | 2020 |
| Iroquois West High School | Gilman | Prairie 8 | 2021 |
| Islamic Foundation School | Villa Park | Northeast | 2022 |
| Jefferson High School | Rockford | North Central | 2024 |
| Jersey Community High School | Jerseyville | Kaskaskia | 2014 |
| John Hancock College Prep | Chicago | Chicago | 2024 |
| Johnsburg High School | Johnsburg | North Central | 2024 |
| Johnston City High School | Johnston City | Little Egypt | 2024 |
| Joliet Catholic Academy | Joliet | Prairie 8 | 2024 |
| Joliet Central High School | Joliet | Prairie 8 | 2021 |
| Jones College Prep | Chicago | Chicago | 2024 |
| Joppa-Maple Grove High School | Joppa | Little Egypt | 2023 |
| Judah Christian High School | Champaign | Kickapoo | 2021 |
| Kankakee High School | Kankakee | Prairie 8 | 2024 |
| Keith Country Day School | Rockford | North Central | 2021 |
| Kelly High School | Chicago | Chicago | 2021 |
| Kenwood High School | Chicago | Chicago | 2015 |
| Kewanee High School | Kewanee | Blackhawk | 2024 |
| King College Prep High School | Chicago | Chicago | 2015 |
| Knoxville High School | Knoxville | Hopewell | 2011 |
| Lake Forest High School | Lake Forest | Northeast | 2015 |
| Lake Park High School | Roselle | Northeast | 2024 |
| Lake View High School | Chicago | Chicago | 2013 |
| Lakes Community High School | Lake Villa | Northeast | 2024 |
| Lane Tech High School | Chicago | Chicago | 2014 |
| Larkin High School | Elgin | North Central | 2024 |
| LaSalle-Peru High School | LaSalle | Prairie 8 | 2015 |
| Lawrenceville High School | Lawrenceville | Eastern | 2022 |
| Lebanon High School | Lebanon | Kaskaskia | 2019 |
| Lena-Winslow High School | Lena | Northwest | 2024 |
| Leo High School | Chicago | Chicago | 2022 |
| Leyden High School | Franklin Park | Northeast | 2023 |
| Liberty High School | Liberty | Illinois Valley | 2024 |
| Libertyville High School | Libertyville | Northeast | 2022 |
| Limestone Community High School | Bartonville | Hopewell | 2017 |
| Lincoln High School | Lincoln | Cenois | 2017 |
| Lincoln-Way Central High School | New Lenox | Prairie 8 | 2012 |
| Lincolnwood High School | Raymond | Cenois | 2024 |
| Litchfield High School | Litchfield | Kaskaskia | 2012 |
| Lowpoint-Washburn High School | Washburn | Hopewell | 2024 |
| Loyola Academy | Wilmette | Northeast | 2022 |
| Lyons Township High School | LaGrange | Northeast | 2024 |
| MacArthur High School | Decatur | Cenois | 2024 |
| Macomb High School | Macomb | Illinois Valley | 2024 |
| Madison High School | Madison | Kaskaskia | 2024 |
| Mahomet-Seymour High School | Mahomet | Kickapoo | 2024 |
| Maine South High School | Park Ridge | Northeast | 2015 |
| Maine West High School | Des Plaines | Northeast | 2016 |
| Marengo High School | Marengo | North Central | 2022 |
| Marian Catholic High School | Chicago Heights | Northeast | 2019 |
| Marian Central Catholic High School | Woodstock | North Central | 2017 |
| Marion High School | Marion | Little Egypt | 2024 |
| Marist High School | Chicago | Chicago | 2018 |
| Marmion Academy | Aurora | North Central | 2024 |
| Marquette Catholic High School | Alton | Kaskaskia | 2023 |
| Marquette High School | Ottawa | Prairie 8 | 2016 |
| Martinsville High School | Martinsville | Eastern | 2022 |
| Maryville Christian School | Maryville | Kaskaskia | 2023 |
| Mascoutah High School | Mascoutah | Kaskaskia | 2024 |
| Mater Dei High School | Breese | Kaskaskia | 2017 |
| Mather High School | Chicago | Chicago | 2016 |
| Mattoon High School | Mattoon | Eastern | 2024 |
| Mendota High School | Mendota | Prairie 8 | 2024 |
| Meredosia-Chambersburg High School | Meredosia | Illinois Valley | 2024 |
| Meridian High School | Macon | Cenois | 2020 |
| Meridian High School | Mounds | Hopewell | 2022 |
| Midland High School | Varna | Hopewell | 2024 |
| Midwest Central High School | Manito | Hopewell | 2024 |
| Minooka Community High School | Minooka | Prairie 8 | 2024 |
| Momence High School | Momence | Prairie 8 | 2024 |
| Monmouth-Roseville High School | Monmouth | Blackhawk | 2024 |
| Morgan Park High School | Chicago | Chicago | 2018 |
| Morris Community High School | Morris | Prairie 8 | 2024 |
| Morrison High School | Morrison | Northwest | 2023 |
| Morrisonville High School | Morrisonville | Cenois | 2024 |
| Morton High School | Morton | Hopewell | 2024 |
| Mother McAuley High School | Chicago | Chicago | 2017 |
| Mt. Carmel High School | Mt. Carmel | Eastern | 2015 |
| Mt. Olive High School | Mt. Olive | Kaskaskia | 2017 |
| Mt. Pulaski High School | Mt. Pulaski | Cenois | 2024 |
| Mt. Vernon Township High School | Mt. Vernon | Little Egypt | 2024 |
| Mt. Zion High School | Mt. Zion | Cenois | 2020 |
| Mundelein High School | Mundelein | Northeast | 2018 |
| Murphysboro High School | Murphysboro | Little Egypt | 2024 |
| Naperville North High School | Naperville | Northeast | 2013 |
| Neuqua Valley High School | Naperville | Northeast | 2013 |
| New Berlin High School | New Berlin | Cenois | 2024 |
| New Trier High School | Winnetka | Northeast | 2024 |
| Newark High School | Newark | Prairie 8 | 2024 |
| Newman Central Catholic High School | Sterling | Northwest | 2014 |
| Newton High School | Newton | Eastern | 2024 |
| Niles North High School | Skokie | Northeast | 2014 |
| Noble Street Charter High School | Chicago | Chicago | 2012 |
| Nokomis High School | Nokomis | Eastern | 2018 |
| Normal Community High School | Normal | Cenois | 2023 |
| Normal West High School | Normal | Cenois | 2024 |
| North Boone High School | Poplar Grove | North Central | 2024 |
| North Lawndale College Prep High School | Chicago | Chicago | 2022 |
| Northside College Prep High School | Chicago | Chicago | 2023 |
| Northwestern High School | Palmyra | Kaskaskia | 2024 |
| Notre Dame College Prep High School | Niles | Northeast | 2019 |
| O'Fallon High School | O'Fallon | Kaskaskia | 2024 |
| Oak Lawn Community High School | Oak Lawn | Northeast | 2017 |
| Oak Park and River Forest High School | Oak Park | Northeast | 2023 |
| Oakland High School | Oakland | Eastern | 2023 |
| Oakwood High School | Fithian | Kickapoo | 2024 |
| Oblong High School | Oblong | Eastern | 2018 |
| Odin High School | Odin | Kaskaskia | 2024 |
| Okaw Valley High School | Bethany | Eastern | 2019 |
| Okawville High School | Okawville | Kaskaskia | 2024 |
| Olympia High School | Stanford | Cenois | 2024 |
| Orangeville High School | Orangeville | Northwest | 2013 |
| Oregon Jr./Sr. High School | Oregon | Northwest | 2024 |
| Orion High School | Orion | Blackhawk | 2023 |
| Oswego East High School | Oswego | North Central | 2016 |
| Oswego High School | Oswego | North Central | 2023 |
| Ottawa Township High School | Ottawa | Prairie 8 | 2023 |
| Palatine High School | Palatine | Northeast | 2016 |
| Palestine High School | Palestine | Eastern | 2015 |
| Paris High School | Paris | Eastern | 2024 |
| Pawnee High School | Pawnee | Cenois | 2021 |
| Paxton-Buckley-Loda High School | Paxton | Kickapoo | 2023 |
| Payson Seymour High School | Payson | Illinois Valley | 2019 |
| Pekin High School | Pekin | Hopewell | 2024 |
| Peoria Heights High School | Peoria Heights | Hopewell | 2020 |
| Peoria High School | Peoria | Hopewell | 2021 |
| Peotone High School | Peotone | Prairie 8 | 2021 |
| Pinckneyville High School | Pinckneyville | Little Egypt | 2022 |
| Pittsfield High School | Pittsfield | Illinois Valley | 2024 |
| Plainfield Central High School | Plainfield | Prairie 8 | 2018 |
| Plainfield North High School | Plainfield | Prairie 8 | 2021 |
| Plano High School | Plano | Prairie 8 | 2022 |
| Pleasant Hill High School | Pleasant Hill | Illinois Valley | 2017 |
| Pontiac Township High School | Pontiac | Prairie 8 | 2018 |
| Pope County High School | Golconda | Little Egypt | 2024 |
| PORTA High School | Petersburg | Illinois Valley | 2024 |
| Prairie Central High School | Fairbury | Prairie 8 | 2024 |
| Prairie Ridge High School | Crystal Lake | North Central | 2024 |
| Princeton High School | Princeton | Blackhawk | 2024 |
| Prophetstown High School | Prophetstown | Northwest | 2023 |
| Prospect High School | Mt. Prospect | Northeast | 2017 |
| Prosser High School | Chicago | Chicago | 2017 |
| Proviso East High School | Maywood | Northeast | 2024 |
| Proviso West High School | Hillside | Northeast | 2014 |
| Putnam County High School | Granville | Hopewell | 2024 |
| Queen of Peace High School | | Northeast | 2012 |
| Quest Charter Academy | Peoria | Hopewell | 2022 |
| Quincy Notre Dame High School | Quincy | Illinois Valley | 2020 |
| Quincy Senior High School | Quincy | Illinois Valley | 2024 |
| Ramsey High School | Ramsey | Eastern | 2021 |
| Rantoul High School | Rantoul | Kickapoo | 2024 |
| Reavis High School | Burbank | Northeast | 2024 |
| Red Bud High School | Red Bud | Kaskaskia | 2024 |
| Red Hill High School | Bridgeport | Eastern | 2024 |
| Regina Dominican High School | Wilmette | Northeast | 2012 |
| Resurrection College Prep High School | Chicago | Chicago | 2016 |
| Rich East High School | Park Forest | Northeast | 2024 |
| Rich South High School | Richton Park | Northeast | 2015 |
| Richards High School | Oak Lawn | Northeast | 2024 |
| Richland County High School | Olney | Eastern | 2012 |
| Richmond-Burton High School | Richmond | North Central | 2024 |
| Ridgeview High School | Colfax | Cenois | 2012 |
| Ridgewood High School | Norridge | Northeast | 2024 |
| Riverdale High School | Port Byron | Blackhawk | 2024 |
| Riverside-Brookfield High School | Riverside | Northeast | 2024 |
| Riverton High School | Riverton | Cenois | 2021 |
| Rochelle High School | Rochelle | Northwest | 2024 |
| Rochester High School | Rochester | Cenois | 2012 |
| Rock Island High School | Rock Island | Blackhawk | 2018 |
| Rockford Christian High School | Rockford | North Central | 2017 |
| Rolling Meadows High School | Rolling Meadows | Northeast | 2016 |
| Roosevelt High School | Chicago | Chicago | 2016 |
| Rosary High School | Aurora | North Central | 2023 |
| Round Lake High School | Round Lake | Northeast | 2023 |
| Routt Catholic High School | Jacksonville | Illinois Valley | 2024 |
| Roxana High School | Roxana | Kaskaskia | 2024 |
| Roycemore High School | Evanston | Northeast | 2024 |
| Salt Fork High School | Catlin | Kickapoo | 2019 |
| Sandburg High School | Orland Park | Northeast | 2024 |
| Sandwich High School | Sandwich | North Central | 2014 |
| Sangamon Valley High School | Niantic | Cenois | 2024 |
| Scales Mound High School | Scales Mound | Northwest | 2018 |
| Schaumburg High School | Schaumburg | Northeast | 2024 |
| Serena High School | Serena | North Central | 2023 |
| Shelbyville High School | Shelbyville | Eastern | 2024 |
| Sherrard High School | Sherrard | Blackhawk | 2019 |
| Shiloh High School | Hume | Kickapoo | 2024 |
| SIUE Charter School | Edwardsville | Kaskaskia | 2024 |
| South Central High School | Farina | Eastern | 2024 |
| South Elgin High School | South Elgin | North Central | 2024 |
| South Fork High School | Kincaid | Eastern | 2024 |
| Southwestern High School | Piasa | Kaskaskia | 2014 |
| Sparta High School | Sparta | Kaskaskia | 2024 |
| Springfield High School | Springfield | Cenois | 2019 |
| St. Anne Community High School | St. Anne | Prairie 8 | 2021 |
| St. Anthony High School | Effingham | Eastern | 2024 |
| St. Charles East High School | St. Charles | North Central | 2016 |
| St. Charles North High School | St. Charles | North Central | 2024 |
| St. Edward High School | Elgin | North Central | 2024 |
| St. Francis de Sales High School | Chicago | Chicago | 2021 |
| St. Ignatius College Prep | Chicago | Chicago | 2022 |
| St. Joseph-Ogden High School | St. Joseph | Kickapoo | 2024 |
| St. Laurence High School | Burbank | Northeast | 2015 |
| St. Rita of Cascia High School | Chicago | Chicago | 2024 |
| St. Viator High School | Arlington Heights | Northeast | 2024 |
| Stark County High School | Toulon | Hopewell | 2024 |
| Staunton High School | Staunton | Kaskaskia | 2024 |
| Sterling High School | Sterling | Northwest | 2024 |
| Stevenson High School | Lincolnshire | Northeast | 2024 |
| Stewardson-Strasburg High School | Strasburg | Eastern | 2024 |
| Stillman Valley High School | Stillman Valley | Northwest | 2024 |
| Stockton High School | Stockton | Northwest | 2017 |
| Sullivan High School | Chicago | Chicago | 2012 |
| Sullivan High School | Sullivan | Eastern | 2024 |
| Sycamore High School | Sycamore | North Central | 2017 |
| Taylorville High School | Taylorville | Cenois | 2024 |
| Teutopolis High School | Teutopolis | Eastern | 2024 |
| The Willows Academy | Des Plaines | Northeast | 2012 |
| Thornton Fractional North High School | Calumet City | Northeast | 2024 |
| Timothy Christian High School | Elmhurst | Northeast | 2022 |
| Tinley Park High School | Tinley Park | Northeast | 2022 |
| Tremont High School | Tremont | Hopewell | 2024 |
| Tri-City High School | Buffalo | Cenois | 2018 |
| Tri-Point High School | Cullom | Prairie 8 | 2024 |
| Triad High School | Troy | Kaskaskia | 2024 |
| Trico High School | Campbell Hill | Little Egypt | 2024 |
| Trinity Oaks Christian Academy | Cary | Northeast | 2024 |
| Tuscola High School | Tuscola | Kickapoo | 2024 |
| United High School | Monmouth | Blackhawk | 2024 |
| United Township High School | East Moline | Blackhawk | 2024 |
| Unity Christian School | Decatur | Cenois | 2016 |
| Unity High School | Tolono | Kickapoo | 2024 |
| Universal High School | Bridgeview | Northeast | 2013 |
| University of Chicago Laboratory Schools | Chicago | Chicago | 2017 |
| Urbana High School | Urbana | Kickapoo | 2024 |
| Vernon Hills High School | Vernon Hills | Northeast | 2024 |
| Vienna High School | Vienna | Little Egypt | 2024 |
| Villa Grove High School | Villa Grove | Kickapoo | 2024 |
| Waldorf High School | Chicago | Chicago | 2017 |
| Waltonville High School | Waltonville | Little Egypt | 2021 |
| Warrensburg-Latham High School | Warrensburg | Cenois | 2024 |
| Washington High School | Washington | Hopewell | 2019 |
| Waterloo High School | Waterloo | Kaskaskia | 2024 |
| Watseka High School | Watseka | Prairie 8 | 2013 |
| Wauconda High School | Wauconda | Northeast | 2024 |
| Waukegan High School | Waukegan | Northeast | 2024 |
| Waverly High School | Waverly | Illinois Valley | 2019 |
| Wesclin High School | Trenton | Kaskaskia | 2024 |
| West Carroll High School | Savanna | Northwest | 2024 |
| West Prairie High School | Colchester | Illinois Valley | 2013 |
| Western High School | Barry | Illinois Valley | 2011 |
| Wethersfield High School | Kewanee | Blackhawk | 2024 |
| Wheaton North High School | Wheaton | Northeast | 2024 |
| Whitney Young High School | Chicago | Chicago | 2020 |
| Williamsfield High School | Williamsfield | Hopewell | 2012 |
| Willowbrook High School | Villa Park | Northeast | 2022 |
| Wilmington High School | Wilmington | Prairie 8 | 2024 |
| Winchester High School | Winchester | Illinois Valley | 2021 |
| Windsor High School | Windsor | Eastern | 2024 |
| Winnebago High School | Winnebago | Northwest | 2024 |
| Wolcott College Prep | Chicago | Chicago | 2024 |
| Woodland High School | Streator | Prairie 8 | 2023 |
| Woodstock High School | Woodstock | North Central | 2020 |
| Woodstock North High School | Woodstock | North Central | 2024 |
| York High School | Elmhurst | Northeast | 2024 |
| Zeigler-Royalton High School | Zeigler | Little Egypt | 2024 |