- Academy NW/Family Academy
- Alger Learning Center, Inc.
- All Saints School
- Arbor School
- Assumption School
- Assumption-St. Bridget School
- Auburn Adventist Academy
- Bellarmine Preparatory School
- Bellevue Children’s Academy
- Bellevue Christian Mack Elementary
- Bellevue Christian School
- Bellevue Montessori School
- Billings Middle School
- Brighton School
- Brooklake Christian School
- Buena Vista SDA School
- Burlington Little School
- Cascade Christian Academy
- Cataldo School
- Cedar Park Christian School
- Charles Wright Academy
- Chelan Valley Independent School
- Chief Leschi School
- Child School/New Heights School
- Christ the King Academy
- Christ the King School
- Christian Life School
- Chrysalis School
- Community Christian Academy
- Cornerstone Christian School
- Cougar Mountain Academy
- Dartmoor School
- Discovery Montessori
- Eastside Catholic High School
- Eastside Christian School
- * Eastside Montessori Education Foundation
- Emerald Heights Academy
- Eton School
- Evergreen Academy
- Evergreen Lutheran High School
- Evergreen School
- Fairview Christian School
- Family Academy/Academy NW
- Forest Ridge School of Sacred Heart
- French-Am School of Puget Sound
- Glen Eden Institute
- Gig Harbor Academy/Our School
- Hamlin Robinson School
- Happy Medium School
- Hawthorn Schools
- Heritage Christian School
- Highlands Christian School
- Holy Names Academy
- Holy Rosary Elementary
- Holy Rosary School
- Islamic School of Seattle
- Island School
- JF Kennedy Memorial High School
- Kings Schools
- Kings West School
- La Salle High School
- Lake Washington Girls Middle School
- Lakeside School
- Liberty Christian School
- Life Christian School
- Lynden Christian Schools
- Meridian School
- Monroe Montessori School
- Neighborhood Christian School
- New Horizon School
- Northshore Christian Academy
- Northwest Christian School
- Northwest School
- O’Dea High School
- Olympia Waldorf School
- Open Window School
- Overlake School
- Pacific Crest Academy
- Paladin Academy
- Peace Lutheran School
- Puget Sound Adventist Academy
- Rose Hill Academy/Children’s Academic Program
- Sacred Heart School
- Seabury School
- Seattle Academy of Arts/Sciences
- Seattle Christian School
- * Seattle Girls School
- Seattle Jewish Community School
- Seattle Lutheran High School
- Seattle Prep/Matteo Ricci College
- Seattle Waldorf School
- Shamrock Educational Academy
- Shoreline Christian School
- Silverwood School
- Skinner Montessori School
- Sky Valley SDA School
- * Skys The Limit Montessori
- Snohomish County Christian
- Solomon Christian School
- Soundview Private School
- * Spectrum Learning Community
- Spring Valley Montessori
- Springhurst School
- St. Alphonsus School
- St. Catherine School
- St. George’s School
- St. Joseph School
- St. Michaels School
- St. Monica School
- St. Patrick School
- The Bear Creek School
- The Bush School
- The Children’s Inn
- The Clearwater School
- The Village School
- University Preparatory
- Upper Columbia Academy
- Valley Christian School
- Villa Academy
- Voyager Montessori Elementary
- WA Academy of Performing Arts
- Walla Walla Valley Academy
- West Sound Academy
- Whatcom Day Academy
- Whidbey Island Waldorf School
- Zion Prep Academy
