2021-2022 ICNS Member Schools
| Altus Academy | Chicago |
| American School | Lansing |
| Aqsa School | Bridgeview |
| Aurora Central Catholic High School | Aurora |
| Carriers of Light | Wheaton |
| Catherine Cook School | Chicago |
| Cornerstone Christian School | Chicago Heights |
| Francis W. Parker | Chicago |
| ICCD Academy | Des Plaines |
| Immanuel Christian Academy | Hillside |
| Immanuel Lutheran School | Palatine |
| Lutheran School Association of Decatur | Decatur |
| Montessori Foundations of Chicago | Chicago |
| Noonan Elementary Academy | Mokena |
| North Shore Country Day School | Winnetka |
| Our Savior's Lutheran | Springfield |
| Pui Tak Christian School | Chicago |
| Sacred Heart Schools | Chicago |
| Scuola Italiana Enrico Fermi | Chicago |
| St. Edward Catholic | Elgin |
| St. John's Lutheran | Bloomington |
| The Avery Coonley School | Downers Grove |
| The Frances Xavier Ward School | Chicago |
| Timothy Christian School | Elmhurst |
| Trinity Lutheran | Burr Ridge |
| Wheaton Christian Grammar School | Winfield |
| Willows Academy | Des Plaines |
| Zion Lutheran School | Marengo |
| Zion Lutheran School | Mt. Pulaski |