Brunswick School
EF Academy
Greenwich Academy
Greenwich Country Day School
Greenwich High School
John Jay High School
Kent School
King School
The Masters School
Miss Porter's School
Northfield Mt. Hermon
The Peddie School
Rye Country Day School
Sacred Heart Greenwich
St. Luke’s School
Taft School
| Academy of Information, Technology & Engineering* | Kimball Union Academy |
| The Benjamin School | King School* |
| Berkshire School* | Laurel Springs School |
| Blair Academy* | Lawrenceville School |
| Blind Brook High School | Loomis Chaffee School |
| Brighton College UK | Marymount School of New York |
| Brunswick School* | The Masters School* |
| Byram Hills High School* | Mercersburg Academy |
| Choate Rosemary Hall* | Middlesex School |
| Columbus Academy | Milton Academy |
| Eastside Preparatory School | Miss Porter's School |
| EF Academy | New Fairfield High School |
| Emma Willard School | Northfield Mount Hermon School |
| The Ethel Walker School | Northwood School |
| Fairfield College Preparatory School* | Notre Dame High School |
| Fiorello H. LaGuardia High School of Music & Art and Performing Arts | Openbaar Lyceum Zeist |
| Fordham Preparatory School | Oscar Romero College Belgium |
| Fox Lane High School | The Peddie School* |
| Greens Farms Academy* | Phillips Academy Andover* |
| Greenwich Academy* | Phillips Exeter Academy |
| Greenwich Country Day School* | Pomfret School |
| Greenwich High School* | Rye Country Day School* |
| Hackley School* | Rye High School |
| Harrison High School (International Baccalaureate World School) | Sacred Heart Greenwich* |
| The Harvey School* | Salisbury School |
| Hopkins School* | St. Luke’s School* |
| International School of Curitiba | St. Joseph's High School |
| International School of Krakow | Taft School |
| John Jay High School | Westhill High School |
| Kent School | Westminster |
| Kildonan School | * Indicates multiple matriculations |
