ICNS Member Schools
- AAA Academy, Blue Island
- Agape Christian High School, Marion
- Al-Huda Academy, Hanover Park
- Alleman High School, Rock Island
- Altamont Lutheran, Altamont
- Altus Academy, Chicago
- Aurora Central Catholic High School, Aurora
- Bethany Lutheran, Naperville
- Brickton Montessori, Chicago
- Calvary, Springfield
- Calvary Academy, South Holland
- Calvary Academy, Springfield
- Calvary Christian, Naperville
- Calvin Christian, South Holland
- Chiaravalle Montessori, Evanston
- Christ the King, Springfield
- Cornerstone Christian, Bloomington
- Countryside, Champaign
- Countryside Day, Northbrook
- Covenant Christian, Aurora
- Daystar, Chicago
- Elgin Academy, Elgin
- First Baptist Academy, O'Fallon
- Good Shepherd, Collinsville
- Greenbrook Montessori, Hanover Park
- Hanna Sacks, Chicago
- Illinois Lutheran Schools, Crete
- Immanuel Lutheran, Belvidere
- Immanuel Lutheran, Palatine
- Islamic Foundation, Villa Park
- Lake Forest County Day, Lake Forest
- MCC Academy, Morton Grove
- Marmion Academy, Aurora
- Midwest Montessori, Evanston
- Noonan Elementary Academy, Mokena
- North Park Elementary, Chicago
- Our Savior's Lutheran, Springfield
- Pilgrim Lutheran, Chicago
- Queen of Angels, Chicago
- Rogers Park Montessori, Chicago
- Science & Arts Academy, Des Plaines
- Seton Montessori, Clarendon Hills
- Solomon Schechter, Northbrook
- Spectrum Progressive, Rockford
- St. Dennis, Lockport
- St. Francis Borgia, Chicago
- St. John's, Red Bud
- St. John's Lutheran, Lombard
- St. Joseph, Downers Grove
- St. Luke's, Montgomery
- St. Matthew, Champaign
- St. Michael, Orland Park
- St. Paul Lutheran, Mount Prospect
- St. Paul's Lutheran, Bourbonnais
- The Frances Xavier Warde School, Chicago
- Timothy Christian, Elmhurst
- Trinity Lutheran, Stewardson
- Wheaton Academy, West Chicago
- Wheaton Christian, Winfield
- Wheaton Montessori, Wheaton
- Woodlands Academy of the Sacred Heart, Lake Forest
- Zion Lutheran, Marengo
- Zion, Stauton