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For the 2026 school year, there are 4 private high schools belonging to Independent Schools Association of the South West (ISAS) serving 3,652 students in Oklahoma. You can also find more schools membership associations in Oklahoma.

The top-ranked private high schools belonging to Independent Schools Association of the South West (ISAS) in Oklahoma include Heritage Hall, Holland Hall, and Riverfield Country Day School.

The average acceptance rate is 58%, which is lower than the Oklahoma private high school average acceptance rate of 82%.

50% of private high schools belonging to Independent Schools Association of the South West (ISAS) in Oklahoma are religiously affiliated (most commonly Episcopal).