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Top 10 Best Oregon Private Schools Belonging to National Association of Independent Schools (NAIS) (2025)

For the 2025 school year, there are 16 private schools belonging to National Association of Independent Schools (NAIS) serving 5,305 students in Oregon. You can also find more schools membership associations in Oregon.
The top ranked private schools belonging to National Association of Independent Schools (NAIS) in Oregon include Catlin Gabel School, The Delphian School, and Oregon Episcopal School.
The average tuition cost is $20,627, which is higher than the Oregon private school average tuition cost of $11,872.
31% of private schools belonging to National Association of Independent Schools (NAIS) in Oregon are religiously affiliated (most commonly Catholic and Episcopal).

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

School
Location
Grades
Students
Bridges Middle School
Bridges Middle School Photo
Special Education School
2510 SW 1st Avenue
Portland, OR 97201
(503) 688-2922
Grades: 5-8
| 64 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
International School Of Portland
International School Of Portland Photo
Special Program Emphasis
(17)
2305 S Water Avenue
Portland, OR 97201
(503) 226-2496
Grades: PK-5
| 397 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
Abiqua School
Abiqua School Photo - Abiqua School is located just south of Salem, in the countryside of the beautiful Willamette Valley.
(5)
6974 Bates Rd SE
Salem, OR 97306
(503) 399-9020
Grades: NS-8
| 191 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
Franciscan Montessori Earth School
Franciscan Montessori Earth School Photo - Peace Day at the Franciscan Montessori Earth School and St. Francis Academy featured 2000 pinwheels
Montessori School (Catholic)
(1)
14750 Se Clinton Street
Portland, OR 97236
(503) 760-8220
Grades: Inquire with school
| 293 students
French International School of Oregon
French International School of Oregon Photo - An eighth-grade student takes a Chinese painting class during the eighth-grade international trip to China. Eighth graders can travel to one of five different countries on their international trips.
Special Program Emphasis
(9)
8500 NW Johnson Street
Portland, OR 97229
(503) 292-7776
Grades: NS-8
| 571 students
Holy Redeemer Catholic School
(Catholic)
127 N Rosa Parks Way
Portland, OR 97217
(503) 283-5197
Grades: PK-8
| 291 students
Oak Hill School
Oak Hill School Photo - The Art Barn
86397 Eldon Schafer Dr
Eugene, OR 97405
(541) 744-0954
Grades: PK-8
| 154 students
Portland Adventist Elementary School
(Seventh Day Adventist)
(3)
3990 Nw 1st Street
Gresham, OR 97030
(503) 665-4102
Grades: PK-8
| 330 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
The Portland Montessori School
The Portland Montessori School Photo - Front entrance
Montessori School
205 NE 50th Ave
Portland, OR 97213
(503) 688-2992
Grades: NS-6
| 151 students
West Hills Montessori School-lake Oswego
Montessori School
4515 Parkview Dr
Lake Oswego, OR 97035
(503) 351-6444
Grades: PK-K
| 68 students

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