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For the 2025-26 school year, there are 14 private high schools belonging to NWAIS (Northwest Association of Independent Schools) serving 5,506 students in Washington. You can also find more schools membership associations in Washington.

The top ranked private high schools belonging to NWAIS (Northwest Association of Independent Schools) in Washington include Saint George's School, Holy Names Academy, and Charles Wright Academy.

The average tuition cost is $31,358, which is higher than the Washington private high school average tuition cost of $17,473.

21% of private high schools belonging to NWAIS (Northwest Association of Independent Schools) in Washington are religiously affiliated (most commonly Catholic and Jewish).