| Enrolled | Graduated | |
| Day Schools | 480 | 3920 |
| Boarding Schools | 185 | 1711 |
| Specialized High Schools† | 3 | 105 |
| Total Students | 668 | 5736 |
| Enrolled | Graduated | |
| Allen-Stevenson | 5 | 133 |
| Avenues | 11 | 16 |
| Bank Street | 2 | 30 |
| Berkeley Carroll | 25 | 78 |
| Birch Wathen Lenox | 37 | |
| Brearley | 22 | 161 |
| Brooklyn Friends | 8 | 47 |
| Brooklyn Heights Montessori | 2 | 4 |
| Browning | 14 | 67 |
| Buckley | 5 | 64 |
| Buckley Country Day | 1 | 7 |
| Calhoun | 8 | 66 |
| Cardinal Spellman | 1 | |
| Cathedral | 1 | 27 |
| Chapin | 13 | 121 |
| City & Country | 6 | |
| Collegiate | 19 | 162 |
| Columbia Prep | 16 | 100 |
| Dalton | 23 | 162 |
| Dwight School | 2 | 5 |
| Dwight-Englewood | 16 | 14 |
| Fieldston | 18 | 168 |
| Friends | 8 | 85 |
| Grace Church | 5 | 86 |
| Hackley | 6 | 49 |
| Hewitt | 4 | 48 |
| Horace Mann | 30 | 244 |
| ISB | 2 | 2 |
| Kew-Forest | 2 | 24 |
| Léman | 1 | 19 |
| Loyola | 0 | 4 |
| LREI | 7 | 68 |
| Mandell | 17 | |
| Manhattan Country | 0 | 24 |
| Marymount | 6 | 31 |
| Nightingale | 13 | 127 |
| Packer | 12 | 118 |
| Poly Prep | 51 | 245 |
| Riverdale | 8 | 110 |
| Rudolf Steiner | 4 | |
| Rye Country Day School | 4 | 61 |
| Sacred Heart | 4 | 43 |
| Saint Ann's | 9 | 108 |
| Saint David's | 3 | 75 |
| Spence | 24 | 128 |
| Speyer | 2 | 7 |
| St. Bernard's | 5 | 87 |
| St. Hilda's & St. Hugh's | 6 | |
| St. Luke's | 4 | 67 |
| Stevenson School | 2 | 4 |
| Town | 4 | 106 |
| Trevor Day | 7 | 32 |
| Trinity | 40 | 296 |
| VCS | 2 | 76 |
| Winchendon | 1 | |
| Xavier | 4 | |
| York Prep | 2 | 15 |
| Other Schools* | 24 |
| Enrolled | Graduated | |
| PREP 9 Consortium Schools | ||
| Andover | 20 | 173 |
| Choate | 13 | 145 |
| Deerfield | 15 | 122 |
| Exeter | 22 | 193 |
| Hill | 10 | 47 |
| Hotchkiss | 15 | 111 |
| Lawrenceville | 9 | 107 |
| Loomis Chaffee | 6 | 49 |
| Middlesex | 10 | 76 |
| Milton | 8 | 88 |
| St. Andrew's | 11 | 81 |
| Taft | 13 | 118 |
| Other Boarding Schools | ||
| Berkshire | 4 | |
| Blair | 10 | |
| Canterbury | 16 | |
| Cardigan | 7 | |
| Church Farm | 2 | 17 |
| Concord | 5 | 13 |
| Dana Hall | 3 | 1 |
| Eaglebrook | 12 | |
| Emma Willard | 16 | |
| Ethel Walker | 2 | 7 |
| Fay | 1 | 28 |
| Fessenden | 8 | |
| Groton | 1 | 16 |
| Frederick Gunn | 1 | 4 |
| Indian Mountain | 7 | |
| Kent | 13 | |
| Masters | 1 | 9 |
| Millbrook | 2 | 8 |
| Miss Hall's | 2 | 4 |
| Miss Porter's | 13 | |
| NMH | 1 | 13 |
| Oakwood Friends | 1 | 3 |
| Oldfields | 7 | |
| Peddie | 1 | 10 |
| Pomfret | 1 | 17 |
| Saddle River | 1 | |
| Sandy Spring Friends | 1 | |
| Solebury | 1 | |
| St. Mark's | 5 | |
| St. Paul's | 15 | |
| St. Timothy's | 7 | |
| Stony Brook School | 7 | |
| Suffield | 5 | |
| Tabor | 18 | |
| Westminster | 1 | 21 |
| Westover | 2 | 4 |
| Westtown | 1 | 5 |
| Williston | 2 | 17 |
| Other Schools* | 34 |