| School | Location | Colors | Mascot | Established | Enrollment | Grades | Head of School | Athletic Director |
| Bancroft School | Worcester, MA | | Bulldogs | 1900 | 420 | PK-12 | James P. "Trey" Cassidy | Tracy Jones |
| Beaver Country Day School | Chestnut Hill, MA | | Beavers | 1920 | 452 | 6-12 | Peter Hutton | Nancy Collins |
| Berwick Academy | South Berwick, ME | | Bulldogs | 1791 | 592 | PK-12 | James Hamilton | Rob Quinn |
| Concord Academy | Concord, MA | | Chameleons | 1922 | 378 | 9-12 | Rick Hardy | Sue Johnson |
| Dana Hall School | Wellesley, MA | | Dragons | 1881 | 484 | 5-12 | Katherine Bradley | John Suby |
| Landmark School | Prides Crossing, MA | | Vikings | 1971 | 465 | 2-12 | Robert Broudo | Brook Sumner |
| Lexington Christian Academy | Lexington, MA | | Lions | 1946 | 350 | 6-12 | Christine Metzger | Ryan Patrie |
| Newton Country Day School | Newton, MA | | Falcons | 1880 | 400 | 5-12 | Sister Barbara Rogers | Kim Southall |
| Pingree School | South Hamilton, MA | | Highlanders | 1961 | 335 | 9-12 | Timothy Johnson | Betsy Kennedy |
| Portsmouth Abbey School | Portsmouth, RI | | Ravens | 1926 | 360 | 9-12 | Daniel McDonough | Al Brown |
| The Winsor School | Boston, MA | | Wildcats | 1886 | 430 | 5-12 | Sarah Pelmas | Sherren Granese |
