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For the 2026 school year, there are 10 private high schools belonging to Independent Schools Association of the Central States (ISACS) serving 4,527 students in Illinois. You can also find more schools membership associations in Illinois.

The top-ranked private high schools belonging to Independent Schools Association of the Central States (ISACS) in Illinois include University of Chicago Laboratory Schools, Roycemore School, and Lycee Francais De Chicago.

The average tuition cost is $41,516, which is higher than the Illinois private high school average tuition cost of $.

10% of private high schools belonging to Independent Schools Association of the Central States (ISACS) in Illinois are religiously affiliated (most commonly Jewish).