Middle States Association (MSA) Member Schools

BoardingSchoolReview.com lists 6 boarding schools as Middle States Association (MSA) members, serving 2,359 students. Learn more about the association at Middle States Association (MSA).

Membership data comes from the schools themselves and from published association directories. See all school associations.

Léman Manhattan Preparatory School Photo

The International School of Schaffhausen Photo - The International School of Schaffhausen is located in the north of Switzerland, in the idyllic town of Schaffhausen. ISSH offers both the IB Diploma Programme and a High School Diploma Programme, with a focus on STEM subjects.

Ross School Photo - Ross School offers both seven- and five-dayboarding options for students in Grades 612and postgraduates. The boarding programprovides students with a "home away fromhome" in luxurious single-family houses in East Hampton and Sag Harbor, hosting student groups under the guidance and care of Ross faculty and staff.

EF Academy New York Photo - Our campus is located an hour outside of New York City in the peaceful suburban community of Thornwood, New York.

Middle States Association (MSA) Member Schools (2026-27)

School

Location

Quick Facts

EF Academy New York

Add to Compare

(2)

582 Columbus Ave
Thornwood, NY 10594
(914) 495-6056

Gr: 9-12 | 290 students Student-teacher ratio: 8:1 Avg. class size: 15 students Tuition listed

George School

(Society of Friends)

Add to Compare

(9)

1690 Newtown Langhorne Road
Newtown, PA 18940
(215) 579-6547

Gr: 9-12 | 540 students Student-teacher ratio: 7:1 Avg. class size: 14 students Tuition listed

Grier School

Add to Compare

(6)

2522 Grier School Road
Tyrone, PA 16686
(814) 684-3000

Gr: 7-12, PG | 5-12, PG (day) | 235 students Student-teacher ratio: 6:1 Avg. class size: 9 students Acceptance rate: 50% Tuition listed

The International School of Schaffhausen

Add to Compare

Mühlentalstrasse 280
Schaffhausen, Switzerland 8200
41526241707

Gr: 9-12 | PK-12 (day) | 280 students Student-teacher ratio: 6:1 Avg. class size: 17 students Tuition listed

Léman Manhattan Preparatory School

Add to Compare

1 Morris Street
New York, NY 10004
(212) 232-0266

Gr: 9-12 | PK-12 (day) | 700 students Student-teacher ratio: 6:1 Avg. class size: 18 students Tuition listed

Ross School

Add to Compare

18 Goodfriend Drive
East Hampton, NY 11937
(631) 907-5400

Gr: 6-12, PG | PK-12, PG (day) | 314 students Student-teacher ratio: 7:1 Avg. class size: 16 students Acceptance rate: 60% Tuition listed

Recent Articles

August 31, 2026

When Small Classes Are Not Enough: Executive Function

Small classes help, but students with executive-function challenges may need more. Learn how to evaluate boarding school coaching, structure, residential support, communication, and systems that build lasting independence over time.

August 31, 2026

How Boarding Schools Handle Staff Misconduct

Learn how boarding schools screen employees, supervise staff, establish professional boundaries, investigate concerns, meet reporting obligations, and communicate with families about misconduct before and after enrollment decisions arise.

August 31, 2026

How to Verify Learning-Support Services Before You Enroll

Learn how to verify boarding school learning-support services before enrolling, including staffing, accommodations, costs, progress monitoring, residential coordination, and questions families should ask during admissions visits and final decisions.