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Commonwealth School Photo - Two blocks from Copley Square, nestled in a pair of brownstones in Boston's Back Bay, the feeling of family persists at Commonwealth, and its location gives students unparalleled access to Boston's resources, fostering meaningful scholarly research, independent projects, and community service.

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Best Massachusetts 91��s Belonging to Membership Associations (2026)

For the 2026 school year, there are 583 private schools belonging to membership associations in Massachusetts.

The most popular school membership associations are Association of Independent Schools in New England (AISNE) (23% of schools), National Association of Independent Schools (NAIS) (21% of schools) and National Catholic Educational Association (NCEA) (20% of schools).

Fay School Photo - Fay School is located on a 66-acre campus 25 miles from Boston in Southborough, Massachusetts, and is the oldest junior boarding school in the United States. Fay currently serves students in Kindergarten through grade nine, with an optional boarding program starting in grade seven.

Fay School Photo - Fay School is located on a 66-acre campus 25 miles from Boston in Southborough, Massachusetts, and is the oldest junior boarding school in the United States. Fay currently serves students in Kindergarten through grade nine, with an optional boarding program starting in grade seven.

Stoneleigh-Burnham School Photo

Nashoba Brooks School Photo

New England Innovation Academy Photo

Commonwealth School Photo - Two blocks from Copley Square, nestled in a pair of brownstones in Boston's Back Bay, the feeling of family persists at Commonwealth, and its location gives students unparalleled access to Boston's resources, fostering meaningful scholarly research, independent projects, and community service.

Catholic Memorial Photo - Middle schoolers work together during their start of school retreat.

Wellan Montessori School Photo

Fusion Academy Newton Photo - Each Fusion campus has a state-of-the-art music studio with professional-grade tools. Students can explore instruments, vocals, songwriting, DJ performing arts, and more.

Bay Farm Montessori Academy Photo - Located in Duxbury, MA, our campus is right off of exit 10/20 on 3a and a short walk away from Duxbury Bay.

Fusion Academy Hingham Photo - Each Fusion campus has a state-of-the-art music studio with professional-grade tools. Students can explore instruments, vocals, songwriting, DJ performing arts, and more.

Miss Hall's School Photo - The MHS graduate is a thinker, a creator and a contributor to the common good. She is a global citizen, a self-aware, resilient, and courageous participant in a multicultural society. Empowered by skills and knowledge, the MHS graduate is able to solve problems with intellect and creativity while embracing a spirit of exploration and curiosity.

Tabor Academy Photo - Situated on the shores of Sippican Harbor, Tabor's 88-acre campus includes direct and immediate access to the water allowing for place-based learning like no other.

Delphi Academy of Boston Photo - Small class sizes, big thinkers & challenging environment. Caring faculty provide personal, one-on-one attention for every child. Over 40 years of educational experience and success.

Kingsley Montessori School Photo - Elementary students exploring a geography work. A key component of the Kingsley mission is raising empathetic global citizens-students who care deeply for the world and work together to improve it.

The Sage School Photo - Summer Sage offers six weeks of enrichment-based, hands-on workshops for curious and motivated students starting at 3 or 4 years old through Grade 6. Our wide variety of workshops allow students to explore their passions with like-minded peers. Classes are offered in-person on our campus in Foxboro, MA! Students have the option to attend morning, afternoon, or full-day sessions.

Fusion Academy Burlington Photo - Each Fusion campus has a state-of-the-art music studio with professional-grade tools. Students can explore instruments, vocals, songwriting, DJ performing arts, and more.

The Advent School Photo - Advent is an independent, Pre-K to Grade 6 school in Beacon Hill serving students from across Greater Boston. With outstanding academics, a robust After School Enrichment program, and small class sizes, Advent prepares students to thrive in middle and high school.

Whitinsville Christian School Photo - Our actively engaged, student-focused, distinctively Christian learning environment includes a strong commitment to outdoor education, inspiring students to grow academically, creatively, and physically while integrating faith into every learning experience. Outdoor Education is a part of our core elementary curriculum.

Worcester Academy Photo - On overhead of our historic campus in the city of Worcester, MA.

Adams Montessori School Photo

Top-Ranked Massachusetts 91��s by Membership Association (2026)

Membership Association

# Schools

# Students

% Minority

Accelerated Christian Education (ACE) or (School of Tomorrow)

3

43

34%

Alabama Association of Independent Schools (AAIS)

1

42

26%

Alternative School Network

1

32

19%

American Association of Christian Schools (AACS)

3

80

80%

American Montessori Society (AMS)

40

4,730

34%

Association Montessori International (AMI)

7

658

42%

Association Montessori Internationale (AMI)

1

52

-

Association of Christian Schools International (ACSI)

25

4,227

36%

Association of Christian Teachers and Schools (ACTS)

2

401

36%

Association of Classical and Christian Schools (ACCS)

2

522

8%

Association of Independent Schools in New England (AISNE)

133

36,450

26%

Association of Waldorf Schools of North America

5

637

11%

Christian Schools International (CSI)

3

980

32%

4

173

2%

Council of Bilingual Education

1

31

15%

Educational Records Bureau

3

572

10%

European Council for International Schools

3

163

34%

Friends Council on Education (FCE)

1

-

-

General Conference of the Seventh Day Adventist Church (GCSDAC)

4

702

77%

Institute for Independent Education

3

143

22%

International Baccalaureate (IB) World School

3

1,320

15%

International Boys Schools Coalition

3

1,401

36%

International Coalition of Girls Schools

1

381

14%

International Montessori Council (IMC)

1

34

-

Islamic School League of America (ISLA)

4

466

63%

Jesuit Secondary Education Association (JSEA)

4

505

46%

Learning Disabilities Association of America (LDA)

2

484

8%

Middle States Association of Colleges and Secondary Schools

1

50

-

National Association for the Education of Young Children

112

9,158

46%

National Association for the Gifted

1

96

20%

National Association of College Admissions Counselors

4

1,285

19%

National Association of Episcopal Schools (NAES)

5

1,651

52%

National Association of Independent Schools (NAIS)

123

35,805

26%

National Association of Laboratory Schools

3

344

39%

National Association of Private Catholic and Independent Schools (NAPCIS)

1

245

27%

National Association of Private Special Education Centers

13

981

24%

National Catholic Education Association

3

1,090

8%

National Catholic Educational Association (NCEA)

116

36,183

30%

National Coalition of Alternative Community Schools

2

175

47%

National Coalition of Boys Schools

2

855

41%

National Coalition of Girls

13

4,172

23%

National Council for 91�� Accreditation

2

149

49%

National Independent 91��s Association

7

1,707

29%

National Junior Honor Society (NJHS)

1

249

31%

National Middle School Association

1

424

5%

National Society of Hebrew Day Schools (NSHDS)

3

292

-

New England Association of Schools and Colleges

110

34,076

28%

New Jersey Association of Independent Schools

1

93

30%

Northwest Association of Accredited Schools

1

200

24%

Not Available (School did not report any membership associatons).

1

200

24%

Other associations(s) for exceptional children

26

1,644

27%

Other Montessori association(s)

26

1,777

29%

Other religious school association(s)

17

2,239

40%

Other school association(s)

90

14,185

33%

Other special emphasis association(s)

32

3,715

45%

Prizmah: Center for Jewish Day Schools

1

242

6%

Solomon Schechter Day Schools (SSDS)

3

737

4%

State or regional independent school association

33

4,878

32%

The Association of Boarding Schools (TABS)

26

8,350

29%

Waldorf Early Childhood Association of North America

1

117

6%

Xaverian Brothers School Sponsorship

1

762

37%

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