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| Beacon Academy | C | | | Illinois Regional | (Independent School) | IL | |
| Ed W. Clark High School | C | | | Nevada Science Olympiad | Clark County School District | NV |
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| Elgin High School | C | | | Rock Valley/Elgin Regional | School District U-46 | IL | |
| Evanston Township High School | C | | | Oakton | Evanston Township High School District 202 | IL | |
| Foothill High School | C | | | Alameda Regional Science Olympiad | Pleasanton USD | CA | |
| Glenbrook North HS | C | | | Oakton | Glenbrook District 225 | IL | |
| Glenbrook South High School | C | | | Illinois State Science Olympiad | Glenbrook 225 | IL | |
| Hinsdale South HS | C | | | Illinois Regional | Hinsdale Township High School District 86 | IL | |
| Illinois Mathematics and Science Academy | C | | | College of Dupage | Illinois Mathematics and Science Academy | IL | |
| John Adams H. S. | C | | | State | South Bend Community School Corporation | IN | |
| Lake Central High School | C | | | State | Lake Central School Corp. | IN | |
| Lane Tech College Prep High School | C | | | Chicago Public Schools Regional | Chicago Public Schools | IL | |
| Loyola Academy | C | | | Illinois State Science Olympiad | Roman Catholic Archdiocese of Chicago | IL | |
| Lyons Township High School | C | | | Illinois Regional | Lyons Township High School D204 | IL | |
| Mundelein High School | C | | | Illinois State Science Olympiad | 120 | IL |
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| Munster High School | C | | | Valpo Regional | School Town of Munster | IN | |
| Naperville Central High School | C | | | COD | Naperville CUSD203 | IL | |
| North Shore Country Day School | C | | | Oakton | Private School | IL | |
| Northside College Prep | C | | | CPS | CPS | IL | |
| Payton College Prep | C | | | Walter Payton College Prep | Chicago Public Schools | IL | |
| University High School | C | | | Illinois State Science Olympiad | Illinois State University | IL | |
| Vernon Hills High School | C | | | Illinois Regional | Community High School District 128 | IL | |
| Whitney M. Young Magnet High School | C | | | CPS Regionals | Chicago Public Schools | IL |
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