District I – Five Schools

Bridgton Academy
Gould Academy
Hebron Academy
Hyde School
Kents Hill School

District II – Twelve Schools

Brewster Academy
Cardigan Mountain School
Dublin School
High Mowing School
Holderness School
Kimball Union Academy
New Hampton School
Proctor Academy
St. Paul’s School
Tilton School
Vermont Academy
The White Mountain School

District III – 77 Schools

Academy at Penguin Hall
Applewild School
Austin Preparatory School
Bancroft School
Beaver Country Day School
Belmont Day School
Belmont Hill School
Berwick Academy
Boston Trinity Academy
Boston University Academy
Bradford Christian Academy
Brimmer & May School
British International School of Boston
Brooks School
Brookwood School
Buckingham Browne & Nichols School
Cambridge School of Weston
Carroll School
CATS Academy
Chapel Hill – Chauncy Hall School
Charles River School
Commonwealth School
Concord Academy
Covenant Christian Academy
Cushing Academy
Dana Hall School
Dedham Country Day School
Derby Academy
DexterSouthfield School
Fay School
Fenn School
Fessenden School
Gann Academy
Glen Urquhart School
The Governor’s Academy
Groton School
Hillside School
Inly School
International School of Boston
Landmark School
Lawrence Academy
Lexington Christian Academy
Marie Philip and Walden Schools
Meadowbrook School
Middlesex School
Milton Academy
Montrose School
Nashoba Brooks School
Newman School
Newton Country Day School of the Sacred Heart
Noble and Greenough
Park School
Phillips Academy
Phillips Exeter Academy
Pike School
Pingree School
Portsmouth Abbey
The Rivers School
Rocky Hill School
Roxbury Latin School
St. Andrew’s School
St. George’s School
St. Mark’s School
St. Sebastian’s School
Shady Hill School
Shore Country Day School
Tabor Academy
Tenacre Country Day School
Thayer Academy
Tower School
Waldorf School of Lexington
Waring School
Wheeler School
Winchendon School
Winsor School
Woodward School
Worcester Academy

District IV – 65 Schools
Avon Old Farms School
The Bement School
Berkshire School
Brunswick School
Canterbury School
Cheshire Academy
Choate Rosemary Hall
Christian Heritage School
Darrow School
Deerfield Academy
Eagle Hill School
Eaglebrook School
The Ethel Walker School
Faith Christian Academy
Foote School
Forman School
The Frederick Gunn School
Greens Farms Academy
Greenwich Academy
Greenwich Country Day School
Hamden Hall Country Day School
Harvey School
Hoosac School
Hopkins School
Hotchkiss School
Indian Mountain School
Kent School
King
Kingswood-Oxford School
Loomis Chaffee School
MacDuffie School
Marianapolis Preparatory School
Marvelwood School
The Master’s School
The Masters School
Millbrook School
Miss Hall’s School
Miss Porter’s School
New York Military Academy
Northfield Mount Hermon School
Oakwood Friends School
Pomfret School
Rectory School
Renbrook School
Rumsey Hall School
Rye Country Day School
Sacred Heart Greenwich
Salisbury School
School of the Holy Child
South Kent School
St. Luke’s School
St. Thomas More School
Stoneleigh-Burnham School
Storm King School
Suffield Academy
Taft School
Trinity-Pawling School
Watkinson School
Westminster School
Westover School
Wilbraham & Monson Academy
The Williams School
Williston Northampton School
The Woodhall School
Wooster School

ASSOCIATE MEMBERSHIPS 
District I
Lee Academy
North Yarmouth Academy

District II
Academie Saint-Louis
Bishop’s College School
Kings-Edghill School
Stanstead College

District III
Culver Academies
Moses Brown
Nichols School
St. Andrew’s College
Upper Canada College
Wyoming Seminary

District IV
Albany Academies
American School For The Deaf
Capitol Prep Harbor School
EF Academy
The Hill School
The Lawrenceville School
Princeton Day School
Putnam Science Academy
Redemption Christian Academy
Woodstock Academy