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For the 2026 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).