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The Delphian School Photo - At Delphian, you'll design your own high school education, much like at university. There are core courses which everyone does, but many others that you can choose based on your own interests. Then you'll study these subjects on your own, or maybe along with another student, learning from your materials instead of from a teacher lecturing to the whole class
The Delphian School

Best Oregon Private Schools Belonging to Membership Associations (2026)

For the 2026 school year, there are 291 private schools belonging to membership associations in Oregon.
The most popular school membership associations are Association of Christian Schools International (ACSI) (19% of schools), Other school association(s) (17% of schools) and National Catholic Educational Association (NCEA) (16% of schools).

Top-Ranked Oregon Private Schools by Membership Association (2026)

Membership Association
# Schools
# Students
% Minority
AdvancED, Southern Association of Colleges and Schools, Council on Accreditation and School Improvement
2
238
26%
Accelerated Christian Education (ACE) or (School of Tomorrow)
5
258
8%
Accreditation International
1
52
15%
American Association of Christian Schools (AACS)
3
365
36%
American Montessori Society (AMS)
8
689
29%
Association Montessori International (AMI)
5
613
23%
Association Montessori Internationale (AMI)
4
790
28%
Association of Christian Schools International (ACSI)
56
11,575
17%
Association of Christian Teachers and Schools (ACTS)
4
391
18%
Association of Classical and Christian Schools (ACCS)
5
831
30%
Association of Waldorf Schools of North America
9
1,403
14%
Christian Schools International (CSI)
3
298
17%
Cognia
36
9,746
20%
Council of Bilingual Education
1
106
-
European Council for International Schools
2
124
27%
Evangelical Lutheran Education Association (ELEA)
4
193
11%
General Conference of SDA Church
1
13
33%
General Conference of the Seventh Day Adventist Church (GCSDAC)
23
1,597
23%
International Baccalaureate (IB) World School
4
1,630
33%
Islamic School League of America (ISLA)
1
74
68%
Jesuit Secondary Education Association (JSEA)
1
1,299
44%
Middle States Association of Colleges and Secondary Schools
2
524
30%
National Association for the Education of Young Children
27
2,412
30%
National Association of Episcopal Schools (NAES)
1
866
23%
National Association of Independent Schools (NAIS)
17
5,516
29%
National Association of Private Schools
2
312
43%
National Association of Private Special Education Centers
1
49
23%
National Catholic Education Association
2
376
56%
National Catholic Educational Association (NCEA)
48
12,498
28%
National Council for Private School Accreditation
1
238
26%
National Honor Society (NHS)
1
377
37%
National Independent Private Schools Association
7
804
17%
National Lutheran Schools Accreditation
2
722
16%
National Society of Hebrew Day Schools (NSHDS)
1
84
-
Northwest Association of Accredited Schools
23
5,305
25%
NWAIS (Northwest Association of Independent Schools)
7
2,485
20%
Other associations(s) for exceptional children
3
330
29%
Other Montessori association(s)
19
1,167
25%
Other religious school association(s)
15
2,406
28%
Other school association(s)
49
6,997
34%
Other special emphasis association(s)
10
1,728
33%
Prizmah: Center for Jewish Day Schools
1
84
-
Progressive Education Network
1
111
17%
Society For Classical Learning
1
286
33%
State or regional independent school association
13
2,741
33%
The Association of Boarding Schools (TABS)
2
271
37%
The French school system abroad (AEFE)
2
218
21%
Waldorf Early Childhood Association of North America
4
654
14%
Western Association of Schools and Colleges (WASC)
3
980
21%
Wisconsin Evangelical Lutheran Synod School Accreditation (WELSSA)
1
96
30%

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