Private School Review - Established 2003
The Delphian School Photo - Delphian is on 720 acres in the beautiful coastal mountains of the Pacific Northwest in Oregon. Here teachers don't lecture in front of a blackboard while students frantically take notes. At our school, students learn at their own pace and study independently with a personalized program that is specifically designed to satisfy their specific needs and interests.
The Delphian School

Best Oregon Private High Schools Belonging to NWAIS (Northwest Association of Independent Schools) (2026)

For the 2026 school year, there are 3 private high schools belonging to NWAIS (Northwest Association of Independent Schools) serving 1,329 students in Oregon. You can also find more schools membership associations in Oregon.
The top-ranked private high schools belonging to NWAIS (Northwest Association of Independent Schools) in Oregon include The Delphian School, Oregon Episcopal School, and Northwest Academy.
The average acceptance rate is 52%, which is lower than the Oregon private high school average acceptance rate of 81%.
33% of private high schools belonging to NWAIS (Northwest Association of Independent Schools) in Oregon are religiously affiliated (most commonly Episcopal).

Top-Ranked Private High Schools Belonging to NWAIS (Northwest Association of Independent Schools) in Oregon (2026)

School
Location
Quick Facts
The Delphian School
The Delphian School Photo - Delphian is on 720 acres in the beautiful coastal mountains of the Pacific Northwest in Oregon. Here teachers don't lecture in front of a blackboard while students frantically take notes. At our school, students learn at their own pace and study independently with a personalized program that is specifically designed to satisfy their specific needs and interests.
Alternative School
(6)
20950 South West Rock Creek Road
Sheridan, OR 97378
(503) 843-3521
Gr: K-12 | 229 students Avg. class size: 13 students Sports: 6 | Extracurrculars: 36 Tuition & acceptance rate listed
Oregon Episcopal School
Oregon Episcopal School Photo - Our beautiful 59-acre campus provides the perfect setting for open minds to inquire, explore, and grow in order to succeed in an ever-changing global community.
(Episcopal)
(5)
6300 SW Nicol Road
Portland, OR 97223
(503) 768-3115
Gr: PK-12 | 866 students Avg. class size: 16 students Sports: 10 | Extracurrculars: 24 Tuition & acceptance rate listed
Northwest Academy
Northwest Academy Photo
(3)
1130 SW Main Street
Portland, OR 97205
(503) 223-3367
Gr: 6-12 | 234 students Avg. class size: 12 students Sports: 2 | Extracurrculars: 19 Tuition & acceptance rate listed

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