2023-2024 ICNS Member Schools
11/8/2023
| Agape Christian High School | Marion |
| Altamont Lutheran Interparish School | Altamont |
| Altus Academy | Chicago |
| American School | Lansing |
| Arie Crown Hebrew Day School | Skokie |
| Calvin Christian School | South Holland |
| Carriers of Light | Wheaton |
| Chicago Academy for the Arts | Chicago |
| Chicago West Side Christian School | Chicago |
| Christ Lutheran High School | Buckley |
| Christ Our Savior LHS | Evansville |
| Cornerstone Christian Academy of McLean County | Bloomington |
| Cornerstone Christian School | Chicago Heights |
| Countryside Day School | Northbrook |
| Francis W. Parker | Chicago |
| Good Shepherd Lutheran | Collinsville |
| Governor French Academy | Belleville |
| Holy Family | Chicago |
| Ida Crown Jewish Academy | Skokie |
| Illinois Lutheran Schools | Crete |
| Immanuel Lutheran School | Okawville |
| Immanuel Lutheran School | Palatine |
| Joan Dachs Bais Yaakov | Chicago |
| Joliet Catholic Academy | Joliet |
| Lansing Christian School | Lansing |
| Leo Catholic High School | Chicago |
| MCC Academy | Skokie |
| Marmion Academy | Aurora |
| Montini Catholic High School | Lombard |
| Montessori School of Lemont | Lemont |
| Mount Carmel High School | Chicago |
| Noonan Elementary Academy | Mokena |
| Our Savior's Lutheran School | Springfield |
| Ronald Knox Montessori School | Wilmette |
| Sacred Heart Schools | Chicago |
| Science Arts & Academy | Des Plaines |
| Seton Montessori Institute & School | Clarendon Hills |
| Skokie Montessori School | Skokie |
| South Side Christian Academy | Peoria |
| Springfield Christian School | Springfield |
| St. Andrews | Park Ridge |
| St. Bede Academy | Peru |
| St. Francis High School | Wheaton |
| St. Theresa School | Palatine |
| Timothy Christian Schools | Elmhurst |
| Trinity Christian School | Shorewood |
| Trinity Lutheran | Burr Ridge |
| Trinity Oaks Christian Academy | Cary |
| Willows Academy | Des Plaines |
| Zion Lutheran School | Litchfield |