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For the 2026 school year, there are 16 private high schools belonging to NWAIS (Northwest Association of Independent Schools) serving 5,630 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 Eastside Catholic School, Saint George's School, and Annie Wright Schools.

The average tuition cost is $31,351, which is higher than the Washington private high school average tuition cost of $17,460.

19% of private high schools belonging to NWAIS (Northwest Association of Independent Schools) in Washington are religiously affiliated (most commonly Catholic and Jewish).