Oregon Episcopal School Photo - OES offers an inquiry-based education that prepares students for higher education and lifelong learning.

Top 5 Best Oregon Private High Schools Belonging to National Association of Independent Schools (NAIS) (2025)

For the 2025 school year, there are 6 private high schools belonging to National Association of Independent Schools (NAIS) serving 2,795 students in Oregon. You can also find more schools membership associations in Oregon.
The top ranked private high schools belonging to National Association of Independent Schools (NAIS) in Oregon include Catlin Gabel School, The Delphian School, and Oregon Episcopal School.
The average acceptance rate is 46%, which is lower than the Oregon private high school average acceptance rate of 79%.
33% of private high schools belonging to National Association of Independent Schools (NAIS) in Oregon are religiously affiliated (most commonly Catholic and Episcopal).

Top Ranked Private High Schools Belonging to National Association of Independent Schools (NAIS) in Oregon (2025)

School
Location
Grades
Students
Catlin Gabel School
Catlin Gabel School Photo - Catlin Gabel is recognized as one of the finest schools in the nation. When students step onto our 67-acre campus, they find themselves in the center of our educational experience: fir trees, meadows, and apple orchard, as well as multimedia classrooms, a creative arts center, state-of-the-art science labs, divisional libraries, soccer fields, tennis courts, an outdoor track, and much more.
8825 SW Barnes Road
Portland, OR 97225
(503) 297-1894
Grades: PK-12
| 784 students
The Delphian School
The Delphian School Photo - At The Delphian School, 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
Grades: K-12
| 229 students
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
Grades: PK-12
| 866 students
Cascades Academy
Cascades Academy Photo - This year marks Cascades Academy's 20th anniversary, and our school is thriving. With a stable foundation in place, we're able to reflect on the challenges and growth we've experienced over the past two decades, and look to the future while creating a vision for the next 20 years. Our faculty and staff took time earlier this year to update our
19860 Tumalo Reservoir Road
Bend, OR 97703
(541) 382-0699
Grades: PK-12
| 256 students
St. Mary's Of Medford
St. Mary's Of Medford Photo
(Catholic)
(1)
816 Black Oak Drive
Medford, OR 97504
(541) 773-7877
Grades: 5-12
| 529 students
Mt. Scott Park Center For Learning
Alternative School
6148 Se Holgate Blvd
Portland, OR 97206
(503) 771-8880
Grades: 9-12
| 131 students

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