| Randolph-Macon Academy | |
| Salisbury School | |
| Solebury School | |
| South Kent School | |
| St. Andrew's School, DE | |
| St. Andrew's School, FL | |
| St. Andrew's School, RI | |
| St. Andrew's -Sewanee | |
| St. George's School | |
| St. James School | |
| St. Johnsbury Academy | |
| St. Mark's School | |
| St. Paul's School | |
| St. Stephen's Episcopal | |
| St. Thomas More School | |
| St. Timothy's | |
| Stevenson School | |
| Stoneleigh-Burnham School | |
| Stony Brook School | |
| Storm King School | |
| Suffield Academy | |
| Tabor Academy | |
| Taft School | |
| TASIS | |
| Thacher School | |
| Tilton School | |
| Trinity-Pawling School | |
| Valley Forge Military Academy | |
| Vermont Academy | |
| Virginia Episcopal School | |
| Walnut Hill School | |
| Watkinson School | |
| Webb School | |
| West Nottingham Academy | |
| Western Reserve Academy | |
| Westminster School | |
| Westover School | |
Westtown School
The White Mountain School
| |
| Wilbraham & Monson Academy | |
| Williston Northampton School | |
| Winchendon School | |
| Wolfeboro Schools | |
| Woodberry Forest School | |
| Woodhall School | |
| Wooster School | |
| Wyoming Seminary | |