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| Taylorville High School | Teutopolis High School | The Einstein Academy | The High School of Saint Thomas More | The Noble Academy |
| Tornadoes | Wooden Shoes | Sabers | Griffins |
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| Thomas Kelly High School | Thompsonville High School | Thornton Fractional North High School | Thornton Fractional South High School | Thornwood High School |
| Trojans | Tigers | Meteors | Red Wolves | Thunderbirds |
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| Tilden High School | Timothy Christian School | Tinley Park High School | Tremont High School | Triad High School |
| Blue Devils | Trojans | Titans | Turks | Knights |
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| Tri-City High School | Trico High School | Triopia High School | Tri-Point High School | Tri-Valley High School |
| Tornadoes | Pioneers | Trojans | Chargers | Vikings |
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| Tuscola High School | UChicago Woodlawn Charter School | UIC College Prep | United High School | United Township High School |
| Warriors | Warriors | Firecats | Red Storm | Panthers |
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| Unity Christian School | Unity High School | Unity-Mendon High School | University of Chicago Laboratory School | University of Illinois Laboratory High School |
| Lions | Rockets | Mustangs | Maroons | Illineks |
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| Vandalia High School | Vernon Hills High School | Victor J. Andrew High School | Vienna High School | Villa Grove High School |
| Vandals | Cougars | Thunderbolts | Eagles | Blue Devils |
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| Virginia High School | VIT High School | Von Steuben Metropolitan Science Center | Walter Payton College Preparatory High School | Walther Christian Academy |
| Trojans | Rebels | Panthers | Grizzlies | Broncos |
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| Waltonville High School | Warren High School | Warren Township High School | Warrensburg-Latham High School | Warsaw High School |
| Spartans | Warriors | Blue Devils | Cardinals | Titans |
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| Waterloo High School | Watseka High School | Wauconda High School | Waukegan High School | Wayne City High School |
| Bulldogs | Warriors | Bulldogs | Bulldogs | Indians |
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| Webber High School | Wells Community Academy High School | Wesclin High School | West Aurora High School | West Carroll High School |
| Trojans | Raiders | Warriors | Blackhawks | Thunder |
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| West Central High School | West Chicago Community High School | West Prairie High School | Western High School | Westfair Christian Academy |
| Heat | Wildcats | Cyclones | Wildcats | Warriors |
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| Westlake Christian Academy | Westmont High School | Wethersfield High School | Wheaton Academy | Wheaton North High School |
| Eagles | Sentinels | Flying Geese | Warriors | Falcons |
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| Wheeling High School | Whitney Young Magnet High School | William Howard Taft High School | Williamsfield High School | Williamsville High School |
| Wildcats | Dolphins | Eagles | Bombers | Bullets |
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| Willowbrook High School | Willows Academy | Wilmington High School | Winchester High School | Windsor High School |
| Warriors | Eagles | Wildcats | Cougars | Hatchets |
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| Winnebago High School | Woodland High School | Woodlands Academy of the Sacred Heart | Woodlawn High School | Woodstock High School |
| Indians | Warriors | Wildcats | Cardinals | Blue Streaks |
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| Woodstock North High School | York High School | Yorkville Christian High School | Yorkville High School | Zeigler-Royalton High School |
| Thunder | Dukes | Mustangs | Foxes | Tornadoes |
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| Zion-Benton Township High School | ||||
| Zee-Bees |