Central

• Champaign Central High School
• Dee-Mack High School
• Dunlap High School
• Henry Senachwine High School
• Lanphier High School
• Lincoln Community High School
• Mahomet-Seymour High School
• Mt. Zion High School
• Normal Community High School
• Paxton-Buckley-Loda High School
• Rantoul Township High School
• Sangamon Valley High School
• St. Teresa High School

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​Central Northern

• Coal City High School
• Evergreen Park Community High School
• Francis W. Parker School
• Illinois Mathematics and Science Academy 
• Lemont High School
• Lincoln-Way Central High School
• Lincoln-Way East High School
• Lincoln-Way West High School
• Providence-St. Mel High School

Eastern

• Beecher City High School
• Edwards County High School​
• Fairfield Community High School​
• Marshall Community High School
• Martinsville High School
• Newton Community High School
• Oblong High School
• Richland County High School
• Stewardson-Strasburg High School

Northern

• Adlai E. Stevenson High School
• East Leyden High School
• Grant Community High School
• Grayslake Central High School
• Grayslake North High School
• ​Huntley High School
• Lake Forest Academy
• Lake Forest High School 
• Lake Zurich High School
• Libertyville High School
• Mundelein High School
• ​Ridgewood High School
• South Beloit High School
• Stillman Valley High School
• Vernon Hills High School
• Warren Township High School
• Wauconda High School
• ​West Leyden High School
• Woodstock High School ​​

Southern

• Anna-Jonesboro High School
• Brehm Preparatory School
• Carbondale Community High School
• Carrier Mills Stonefort High School​
• Carterville High School
• DuQuoin High School
• Gallatin County High School
• Goreville High School
• Hamilton County Senior High School
• Harrisburg High School
• Herrin High School
• Marion High School
• Mt. Vernon Township High School
• Pinckneyville Community High School
• Pope County High School
• Red Bud High School
• Shawnee High School
• Sparta High School
• Steeleville High School
• Trico High School
• Waltonville High School
• Woodlawn High School

Southwestern

• Belleville East High School
• Carlyle High School
• Central Community High School, Breese
• Centralia High School
• Freeburg Community High School
• ​Mater Dei High School
• O'Fallon Township High School
• Okawville High School
• Salem Community High School
• South Central High School​

Western

• Beardstown High School
• Camp Point Central High School
• Carrollton High School
• Illini West High School
• Quincy Senior High School 
• Southeastern High School
• Warsaw High School
• West Central High School

Middle Level Chapters

• Carterville Middle School​
• Evans Junior High School
• St. Matthew's School