- EIL – Eastern Independent League
- Fairchester Athletic Association
- The Founders League
- GIL – Girls Independent League
- HVAL – Housatonic Valley Athletic League
- HVAL – Hudson Valley Athletic League
- ISL – Independent School League
- Lakes Region League
- MAISAD League – Maine Association of Independent Athletic Directors
- MBIL – Massachusetts Bay Independent League
- SENEISAA – Southeastern New England Independent Schools Athletic Association
- IGC – Independent Girls Conference
- Vaillancourt Conference – Girls Hockey
EIL – Eastern Independent League
- Bancroft School
- Beaver Country Day School
- Berwick Academy
- Chapel Hill- Chauncy Hall School
- Concord Academy
- Dana Hall School
- Landmark School
- Lexington Christian Academy
- Newton Country Day School
- The Pingree School
- Portsmouth Abbey School
- The Wheeler School
- The Winsor School
Fairchester Athletic Association
- Brunswick
- Convent of the Sacred Heart
- Greens Farms Academy
- Greenwich Academy
- Hamden Hall
- Holy Child
- Hopkins
- King
- Masters School (NY)
- Rye Country Day School
- St. Luke’s
- Avon Old Farms School
- Choate Rosemary Hall
- Ethel Walker School
- The Hotchkiss School
- Kent School
- Kingswood Oxford School
- Loomis-Chaffee
- Miss Porter’s School
- The Taft School
- Trinity-Pawling School
- Westminster School
GIL – Girls Independent League
- Boston University Academy
- Bradford Christian Academy
- British International School of Boston
- CATS Academy
- Commonwealth School
- International School of Boston
- Marie Philip School
- The Woodward School
- Waldorf HS of Mass Bay
HVAL – Housatonic Valley Athletic League
- Christian Heritage School
- Forman School
- Harvey School
- The Master’s School (CT)
- South Kent School
- Watkinson School
- ​Wooster School
HVAL – Hudson Valley Athletic League
- Darrow
- Faith Christian Academy
- Hoosac
- The Marvelwood School
- New York Military Academy
- Oakwood Friends
- Storm King
- The Woodhall School
ISL – Independent School League
- Belmont Hill School
- Brooks School
- Buckingham Browne & Nichols
- Groton School
- Lawrence Academy
- Middlesex School
- Milton Academy
- Noble & Greenough School
- Roxbury Latin School
- St. George’s School
- St. Mark’s School
- St. Sebastian’s School
- Tabor Academy
- Thayer Academy
- The Governors Academy
- The Rivers School
- Brewster Academy
- Holderness School
- Kimball Union Academy
- New Hampton School
- Proctor Academy
- St. Paul’s School
- Tilton School
- Vermont Academy
MAISAD League
- Hebron Academy
- Gould Academy
- Hyde School
- Kents Hill
- Bridgton Academy
MBIL – Massachusetts Bay Independent League
- Boston Trinity Academy
- Boston Univ. Academy
- Brimmer and May
- Cambridge School of Weston
- Chapel Hill Chauncey Hall
- Commonwealth School
- Covenant Christian Academy
- Gann Academy
- Newman School
- Marie Philip School
- Waldorf HS of Mass Bay
- The Waring School
SENEISAA – Southeastern New England Independent Schools Athletic Association
- Rocky Hill Country Day School
- St. Andrew’s School
- Eagle Hill School
- MacDuffie School
- St. Thomas More School
- CATS Academy Boston
- Dublin School
IGC – Independent Girls Conference
- Boston Trinity Academy
- Brimmer and May
- Cambridge School of Weston
- Chapel Hill Chauncey Hall
- Covenant Christian Academy
- Gann Academy
- Landmark School
- Montrose School
- Newman School
- The Waring School
Vaillancourt Conference – Girls Hockey
Austin Preparatory School
Kents Hill School
North Yarmouth Academy
Northfield Mount Hermon School
Pomfret School
Worcester Academy