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The Sage School Photo - Sagers consistently show an environmentally and community-minded spirit. In Spring 2021 Sage installed "Sprout," a solar tracker that was gifted by faculty and staff of the past and present. The student-led group, Service @ Sage, also works year round to host food drives and other acts of community service.

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

For the 2026 school year, there are 584 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).

Bay Farm Montessori Academy Photo - Our Toddler Program is a joyous, loving, and respectful place that honors our youngest students, ages 12 months to 2.9. At Bay Farm, we encourage our toddlers to be independent and self-confident by making their own choices from among a wide variety of developmentally appropriate materials.

Bay Farm Montessori Academy Photo - Our Toddler Program is a joyous, loving, and respectful place that honors our youngest students, ages 12 months to 2.9. At Bay Farm, we encourage our toddlers to be independent and self-confident by making their own choices from among a wide variety of developmentally appropriate materials.

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.

Delphi Academy of Boston Photo - Delphi offers strong academics and a personal approach. The program is geared to children pre-k to 8th grade. Students are both helped and challenged. We want to see students grow, stretch, reach higher and further, and prepare them to be independent learners. The program taps into the unique beauty, talent and genius of each child.

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.

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.

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.

Fusion Academy Burlington Photo - Classes at Fusion are one-to-one: one student and one teacher per classroom. Students have different teachers for different subjects, and teachers act as mentors in the one-to-one setting.

New England Innovation Academy Photo

Nashoba Brooks School Photo

The Sage School Photo - Sagers consistently show an environmentally and community-minded spirit. In Spring 2021 Sage installed "Sprout," a solar tracker that was gifted by faculty and staff of the past and present. The student-led group, Service @ Sage, also works year round to host food drives and other acts of community service.

Fusion Academy Newton Photo - Classes at Fusion are one-to-one: one student and one teacher per classroom. Students have different teachers for different subjects, and teachers act as mentors in the one-to-one setting.

Stoneleigh-Burnham School Photo

Wellan Montessori School Photo

Catholic Memorial Photo - The performing arts are a staple at CM. Band, choir, and its acapella offshoot, the Baker Street Boys, as well as theater give rise to students' artistic and creative instincts and provides the well-rounded education synonymous with student life at CM.

Miss Hall's School Photo - 90 acres nestled in the beautiful Berkshires of western Massachusetts.

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.

Fusion Academy Hingham Photo - Classes at Fusion are one-to-one: one student and one teacher per classroom. Students have different teachers for different subjects, and teachers act as mentors in the one-to-one setting.

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 Meadowbrook School Of Weston Photo - Meadowbrook is a co-educational independent day school that inspires and challenges learners in grades junior kindergarten through eight. From their first day, children are asked to think out of the box, be curious, and empathize with those around them.

The Cambridge School Of Weston Photo - When you live on CSW's campus, you get to know this community through a uniquely focused lens. You'll have additional access to teachers, facilities, friends, and all of the resources and cultural opportunities Greater Boston has to offer. And with all that happens on weekends and after hours, there's no shortage of excitement.

Top-Ranked Massachusetts ��ԭ��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

14

4,456

22%

National Council for ��ԭ�� Accreditation

2

149

49%

National Independent ��ԭ��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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