Private School Review - Established 2003
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
Cascades Academy

Best Oregon Private Schools Belonging to National Association of Independent Schools (NAIS) (2026)

For the 2026 school year, there are 17 private schools belonging to National Association of Independent Schools (NAIS) serving 5,516 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, Cascades Academy, and Oregon Episcopal School.
The average tuition cost is $22,173, which is higher than the Oregon private school average tuition cost of $11,960.
29% 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 (2026)

School
Location
Quick Facts
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
Gr: NS-8 | 226 students Avg. class size: 20 students Sports: 6 | Extracurrculars: 6 Tuition listed
Bridges Middle School
Bridges Middle School Photo
Special Education School
2510 SW 1st Avenue
Portland, OR 97201
(503) 688-2922
Gr: 5-8 | 64 students Avg. class size: 12 students Tuition & acceptance rate listed
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
Gr: PK-12 | 784 students Avg. class size: 17 students Sports: 9 | Extracurrculars: 43 Tuition & acceptance rate listed
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
International School Of Portland
International School Of Portland Photo
Special Program Emphasis
(17)
2305 S Water Avenue
Portland, OR 97201
(503) 226-2496
Gr: PK-5 | 397 students Avg. class size: 13 students Extracurrculars: 4 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
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
Gr: PK-12 | 256 students Avg. class size: 18 students Sports: 8 | Extracurrculars: 11 Tuition & acceptance rate listed
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
Gr: Inquire with school | 293 students Avg. class size: 25 students Sports: 6 | Extracurrculars: 12 Tuition listed
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
Gr: NS-8 | 571 students Avg. class size: 15 students Sports: 5 | Extracurrculars: 17 Tuition listed
Holy Redeemer Catholic School
(Catholic)
127 N Rosa Parks Way
Portland, OR 97217
(503) 283-5197
Gr: PK-8 | 291 students
Oak Hill School
Oak Hill School Photo - The Art Barn
86397 Eldon Schafer Dr
Eugene, OR 97405
(541) 744-0954
Gr: PK-8 | 154 students Avg. class size: 15 students Sports: 3 | Extracurrculars: 5 Tuition & acceptance rate listed
Portland Adventist Elementary School
(Seventh Day Adventist)
(3)
3990 Nw 1st Street
Gresham, OR 97030
(503) 665-4102
Gr: PK-8 | 330 students Avg. class size: 18 students Sports: 5 | Extracurrculars: 6 Tuition & acceptance rate listed
St. Mary's Of Medford
St. Mary's Of Medford Photo
(Catholic)
(1)
816 Black Oak Drive
Medford, OR 97504
(541) 773-7877
Gr: 5-12 | 529 students Avg. class size: 18 students Sports: 13 | Extracurrculars: 16 Tuition listed
Ashbrook Independent School
Ashbrook Independent School Photo
4045 SW Research Way
Corvallis, OR 97333
(541) 766-8313
Gr: NS-8 | 176 students Avg. class size: 17 students Sports: 1 | Extracurrculars: 19 Tuition listed
Mt. Scott Park Center For Learning
Alternative School
6148 Se Holgate Blvd
Portland, OR 97206
(503) 771-8880
Gr: 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
Gr: NS-6 | 151 students Avg. class size: 22 students Tuition listed
West Hills Montessori School-lake Oswego
Montessori School
4515 Parkview Dr
Lake Oswego, OR 97035
(503) 351-6444
Gr: PK-K | 68 students Tuition listed

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