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For the 2025-26 school year, there are 2 private high schools belonging to Middle States Association of Colleges and Secondary Schools serving 578 students in Washington. You can also find more schools membership associations in Washington.

The top ranked private high school belonging to Middle States Association of Colleges and Secondary School in Washington is Cascade Christian Academy.

The average acceptance rate is 92%, which is higher than the Washington private high school average acceptance rate of 83%.

50% of private high schools belonging to Middle States Association of Colleges and Secondary Schools in Washington are religiously affiliated (most commonly Seventh Day Adventist).