For the 2025 school year, there are 494 private schools belonging to membership associations in Washington.
The most popular school membership associations are Other school association(s) (17% of schools), National Catholic Educational Association (NCEA) (16% of schools) and Association of Christian Schools International (ACSI) (15% of schools).
Top Ranked Washington Private Schools by Membership Association (2025)
Membership Association
# Schools
# Students
% Minority
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