This list of high schools and cities is part of WikiProject Missing Articles.
- Edwards County High School — Albion, Illinois
- Altamont High School — Altamont, Illinois
- Arcola High School — Arcola, Illinois
- Argenta-Oreana High School — Argenta, Illinois
- Armstrong High School (Illinois) — Armstrong, Illinois
- Arthur Junior-Senior High School — Arthur, Illinois
- A-C Central High School — Ashland, Illinois
- Ashton High School — Ashton, Illinois
- Atwood Hammond High School — Atwood, Illinois
- Auburn High School (Illinois) — Auburn, Illinois
- Barry High School — Barry, Illinois
- Beecher City High School — Beecher City, Illinois
- Bement High School — Bement, Illinois
- Bluffs High School — Bluffs, Illinois
- Webber Township High School — Bluford, Illinois
- Red Hill High School — Bridgeport, Illinois
- Heritage High School (Illinois) — Broadlands, Illinois
- Brownstown High School — Brownstown, Illinois
- Tri-City High School — Buffalo, Illinois
- Trico High School — Campbell Hill, Illinois
- Carbondale Community High School Central — Carbondale, Illinois
- Carlyle Community High School — Carlyle, Illinois
- Carrollton Community High School — Carrollton, Illinois
- Carthage High School (Illinois) — Carthage, Illinois
- Grove Community High School — Cary, Illinois
- Casey-Westfield High School — Casey, Illinois
- Catlin High School — Catlin, Illinois
- Cerro Gordo High School — Cerro Gordo, Illinois
- High School of Saint Thomas More — Champaign, Illinois
- Chenoa High School — Chenoa, Illinois
- Carver Area High School — Chicago
- Collins Academy High School — Chicago
- Best Practice High School — Chicago
- Luther North High School — Chicago
- Spalding High School (Illinois) — Chicago
- Tesla Alternative High School for Pregnant Girls — Chicago
- Chrisman High School — Chrisman, Illinois
- Christopher Community High School — Christopher, Illinois
- Cisne High School — Cisne, Illinois
- Cissna Park High School — Cissna Park, Illinois
- Clay City High School — Clay City, Illinois
- Cobden High School — Cobden, Illinois
- Ridgeview High School (Illinois) — Colfax, Illinois
- Triopia Junior-Senior High School — Concord, Illinois
- Coulterville High School — Coulterville, Illinois
- Cowden-Herrick High School — Cowden, Illinois
- Crescent-Iroquois High School — Crescent City, Illinois
- Tri-Point High School — Cullom, Illinois
- Decatur Christian High School — Decatur, Illinois
- Delavan High School — Delavan, Illinois
- Dieterich Junior-Senior High School — Dieterich, Illinois
- Donovan Junior-Senior High School — Donovan, Illinois
- Duquoin High School — Du Quoin, Illinois
- Dupo High School — Dupo, Illinois
- Earlville High School — Earlville, Illinois
- Effingham High School — Effingham, Illinois
- El Paso High School (Illinois) — El Paso, Illinois
- Eldorado High School (Illinois) — Eldorado, Illinois
- Immaculate Conception High School (Illinois) — Elmhurst, Illinois
- Fairfield Community High School — Fairfield, Illinois
- South Central High School (Illinois) — Farina, Illinois
- Oakwood High School (Illinois) — Fithian, Illinois
- Flora High School — Flora, Illinois
- Forreston High School — Forreston, Illinois
- Franklin Center Junior-Senior High School — Franklin Grove, Illinois
- Aquin Central Catholic High School — Freeport, Illinois
- Gardner-South Wilmington Township High School — Gardner, Illinois
- Georgetown-Ridge Farm High School — Georgetown, Illinois
- Gcms High School — Gibson City, Illinois
- Gillespie High School — Gillespie, Illinois
- Iroquois West High School — Gilman, Illinois
- Goreville High School — Goreville, Illinois
- Grayslake High School — Grayslake, Illinois
- Grayville High School — Grayville, Illinois
- Greenfield High School (Illinois) — Greenfield, Illinois
- Greenview High School — Greenville, Illinois
- Gridley High School (Illinois) — Gridley, Illinois
- Griggsville High School — Griggsville, Illinois
- Alden-Hebron High School — Hebron, Illinois
- Heyworth High School — Heyworth, Illinois
- Hinckley-Big Rock High School — Hinckley, Illinois
- Homewood Christian Academy — Homewood, Illinois
- Hoopeston Area High School — Hoopeston, Illinois
- Hutsonville High School — Hutsonville, Illinois
- Illiopolis High School — Illiopolis, Illinois
- Industry High School — Industry, Illinois
- Jacksonville High School (Illinois) — Jacksonville, Illinois
- Routt High School — Jacksonville, Illinois
- Johnston City High School — Johnston City, Illinois
- Kansas High School — Kansas, Illinois
- South Fork Junior-Senior High School — Kincaid, Illinois
- West Pike High School — Kinderhook, Illinois
- Hiawatha High School — Kirkland, Illinois
- La Harpe High School — La Harpe, Illinois
- Luther East High School — Lansing, Illinois
- Lewistown Community High School — Lewistown, Illinois
- Livingston High School — Livingston, Illinois
- North Clay Community High School — Louisville, Illinois
- Dee-Mack High School — Mackinaw, Illinois
- Madison Senior High School — Madison, Illinois
- Midwest Central High School — Manito, Illinois
- Manteno High School — Manteno, Illinois
- Marengo High School — Marengo, Illinois
- Crab Orchard High School — Marion, Illinois
- Marissa Junior-Senior High School — Marissa, Illinois
- Martinsville High School (Illinois) — Martinsville, Illinois
- Illini Central High School — Mason City, Illinois
- McLeansboro High School — McLeansboro, Illinois
- Milford High School (Illinois) — Milford, Illinois
- Momence High School — Momence, Illinois
- Central A & M High School — Moweaqua, Illinois
- Mount Olive High School (Illinois) — Mount Olive, Illinois
- Mount Pulaski High School — Mount Pulaski, Illinois
- Mulberry Grove High School — Mulberry Grove, Illinois
- Murphysboro High School — Murphysboro, Illinois
- Nauvoo-Colusa Senior High School — Nauvoo, Illinois
- Neoga Junior-Senior High School — Neoga, Illinois
- Newton Community High School — Newton, Illinois
- Niantic-Harristown High School — Niantic, Illinois
- West Richland High School — Noble, Illinois
- Calvary Baptist Academy (Normal, Illinois) — Normal, Illinois
- Norris City-Omaha-Enfield High School — Norris City, Illinois
- Oakland High School (Illinois) — Oakland, Illinois
- Oblong High School — Oblong, Illinois
- O'Fallon High School — O'Fallon, Illinois
- East Richland High School — Olney, Illinois
- Rich Central Campus High School — Olympia Fields, Illinois
- Marquette High School (Illinois) — Ottawa, Illinois
- Palestine High School (Illinois) — Palestine, Illinois
- A.B. Shepard High School — Palos Heights, Illinois
- Pana High School — Pana, Illinois
- Rich East Campus High School — Park Forest, Illinois
- Patoka High School — Patoka, Illinois
- Paw Paw Junior-Senior High School — Paw Paw, Illinois
- Pearl City High School — Pearl City, Illinois
- Peoria Christian School — Peoria, Illinois
- PORTA High School — Petersburg, Illinois
- Pinckneyville High School — Pinckneyville, Illinois
- North Boone High School — Poplar Grove, Illinois
- Ramsey High School (Illinois) — Ramsey, Illinois
- Red Bud High School — Red Bud, Illinois
- Rich South Campus High School — Richton Park, Illinois
- Riverton High School — Riverton, Illinois
- Robinson High School (Illinois) — Robinson, Illinois
- Christian Life High School — Rockford, Illinois
- Lockport High School - West — Romeoville, Illinois
- Roseville High School (Illinois) — Rossville, Illinois
- Salem Community High School — Salem, Illinois
- Sandoval Junior-Senior High School — Sandoval, Illinois
- Seneca High School (Illinois) — Seneca, Illinois
- Serena High School — Serena, Illinois
- Sesser-Valier High School — Sesser, Illinois
- Somonauk High School — Somonauk, Illinois
- South Beloit High School — South Beloit, Illinois
- Sparta High School (Illinois) — Sparta, Illinois
- Grace Baptist Academy (Springfield, Illinois) — Springfield, Illinois
- St. Elmo Junior-Senior High School — St. Elmo, Illinois
- St. Joseph-Ogden High School — St. Joseph, Illinois
- Staunton High School — Staunton, Illinois
- Steeleville High School — Steeleville, Illinois
- Stillman Valley High School — Stillman Valley, Illinois
- Egyptian High School — Tamms, Illinois
- Cumberland High School — Toledo, Illinois
- Wesclin High School — Trenton, Illinois
- Valmeyer High School — Valmeyer, Illinois
- Vandalia Community High School — Vandalia, Illinois
- Villa Grove High School — Villa Grove, Illinois
- Virden High School — Virden, Illinois
- Virginia High School (Illinois) — Virginia, Illinois
- Warrensburg-Latham High School — Warrensburg, Illinois
- Warsaw Junior-Senior High School — Warsaw, Illinois
- Watseka Community High School — Watseka, Illinois
- Waverly High School — Waverly, Illinois
- Wayne City High School — Wayne City, Illinois
- Community High School (Illinois) — West Chicago, Illinois
- West Frankfort High School — West Frankfort, Illinois
- Immaculate Heart of Mary High School — Westchester, Illinois
- Wheaton-Warrenville High School — Wheaton, Illinois
- Windsor High School — Windsor, Illinois
- Shawnee High School — Wolf Lake, Illinois
- Woodlawn Community High School — Woodlawn, Illinois
- Zeigler-Royalton High School — Zeigler, Illinois
- Hartsburg-Emden High School — Hartsburg, Illinois
- Fieldcrest High School — Minonk, Illinois
- Rantoul Township High School — Rantoul, Illinois
- Chicago Discovery Academy — Chicago, Illinois
- Rockford Christian High School — Rockford, Illinois
- Metro-East Lutheran High School — Edwardsville, Illinois
- College Preparatory School of America — Lombard, Illinois
- Benito Juarez Academy High School — Chicago, Illinois
- Chicago International Charter School-Longwood Campus — Chicago, Illinois
- Governor French Academy — Belleville, Illinois
- Collinsville Christian Academy — Collinsville, Illinois
- Belleville West High School — Belleville, Illinois
- John Hancock High School — Chicago, Illinois
- Eagle's Wings Urban Academy — Chicago, Illinois
- Westminster Christian High School — Elgin, Illinois
- Tri-Valley High School (Illinois) — Downs, Illinois
- Okaw Valley High School — Bethany, Illinois
- Josephinum High School — Chicago, Illinois
- Barrington Hills Elite Country Day — Barrington, Illinois
- Schaumburg Christian School — Schaumburg, Illinois
- Mother Theodore Guerin High School — River Grove, Illinois
- Academy of Communications and Technology Charter School — Chicago, Illinois
- Acacia Academy — La Grange Highlands, Illinois
- Lahr-Well Academy — Glen Carbon, Illinois
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