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Best Washington ²ÝÁñÉçÇø Schools Belonging to Membership Associations (2026)

For the 2026 school year, there are 494 private schools belonging to membership associations in Washington.
The most popular school membership associations are Other school association(s) (17% of schools), National Catholic Educational Association (NCEA) (16% of schools) and Association of Christian Schools International (ACSI) (15% of schools).

Top-Ranked Washington ²ÝÁñÉçÇø Schools by Membership Association (2026)

Membership Association
# Schools
# Students
% Minority
AdvancED, Southern Association of Colleges and Schools, Council on Accreditation and School Improvement
2
199
15%
Accelerated Christian Education (ACE) or (School of Tomorrow)
10
881
14%
Accreditation International
1
134
9%
Alternative School Network
1
111
22%
American Association of Christian Schools (AACS)
6
508
18%
American Montessori Society (AMS)
36
4,037
44%
Association Montessori International (AMI)
7
360
16%
Association Montessori Internationale (AMI)
2
345
53%
Association of Christian Schools International (ACSI)
72
26,363
27%
Association of Christian Teachers and Schools (ACTS)
5
2,738
33%
Association of Classical and Christian Schools (ACCS)
11
3,428
13%
Association of LD Schools (ALDS)
1
426
29%
Association of Waldorf Schools of North America
8
1,162
14%
Children and Adults with Attention Deficit or Hyperactivity Disorder (CHADD)
1
90
35%
Christian Schools International (CSI)
14
4,869
15%
Cognia
35
11,303
39%
Council of Bilingual Education
2
129
-
Educational Records Bureau
1
306
70%
Evangelical Lutheran Education Association (ELEA)
8
625
33%
General Conference of the Seventh Day Adventist Church (GCSDAC)
22
1,624
33%
Institute for Independent Education
5
1,426
17%
International Baccalaureate (IB) World School
5
1,758
54%
International Boys Schools Coalition
1
902
68%
International Montessori Council (IMC)
1
26
50%
Jesuit Schools Network
1
115
99%
Jesuit Secondary Education Association (JSEA)
4
2,436
31%
Learning Disabilities Association of America (LDA)
5
222
27%
Middle States Association of Colleges and Secondary Schools
2
578
17%
Montessori Educational Programs International (MEPI)
1
28
26%
National Association for the Education of Young Children
39
2,253
38%
National Association of College Admissions Counselors
3
2,205
44%
National Association of Episcopal Schools (NAES)
1
49
30%
National Association of Independent Schools (NAIS)
58
18,068
37%
National Association of Laboratory Schools
1
29
-
National Association of ²ÝÁñÉçÇø Catholic and Independent Schools (NAPCIS)
2
184
54%
National Association of ²ÝÁñÉçÇø Special Education Centers
1
44
38%
National Catholic Education Association
1
375
47%
National Catholic Educational Association (NCEA)
81
23,163
30%
National Christian School Association (NCSA)
4
238
23%
National Coalition of Alternative Community Schools
1
50
30%
National Coalition of Girls
4
1,322
63%
National Council for ²ÝÁñÉçÇø School Accreditation
8
1,374
34%
National Honor Society (NHS)
2
5,109
50%
National Independent ²ÝÁñÉçÇø Schools Association
11
2,513
23%
National Junior Honor Society (NJHS)
1
4,952
51%
National Lutheran Schools Accreditation
6
1,194
20%
National Society of Hebrew Day Schools (NSHDS)
1
259
3%
Northwest Association of Accredited Schools
33
7,564
24%
Northwest Christian Schools International (NWCSI)
2
594
9%
Not Available (School did not report any membership associatons).
1
88
13%
NWAIS (Northwest Association of Independent Schools)
48
11,902
39%
Other associations(s) for exceptional children
2
212
34%
Other Montessori association(s)
40
2,698
37%
Other religious school association(s)
26
4,043
36%
Other school association(s)
82
18,473
25%
Other special emphasis association(s)
12
2,896
27%
Prizmah: Center for Jewish Day Schools
1
65
3%
Progressive Education Network
1
9
-
Society For Classical Learning
1
173
41%
Southern Baptist Association of Christian Schools (SBACS)
4
618
18%
State or regional independent school association
45
10,243
28%
The Association of Boarding Schools (TABS)
2
1,348
57%
Waldorf Early Childhood Association of North America
4
528
22%
Western Association of Schools and Colleges (WASC)
6
1,678
22%
Wisconsin Evangelical Lutheran Synod School Accreditation (WELSSA)
1
109
21%

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