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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 Casady School, Heritage Hall, and Holland Hall.

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).