| Enrolled | Graduated | |
| Day Schools | 478 | 3,979 |
| Boarding Schools | 201 | 1,754 |
| Specialized High Schools† | 2 | 108 |
| Total Students | 681 | 5,841 |
| Enrolled | Graduated | |
| Allen-Stevenson | 3 | 136 |
| Avenues | 9 | 20 |
| Bank Street | 2 | 31 |
| Berkeley Carroll | 25 | 82 |
| Birch Wathen Lenox | 37 | |
| Brearley | 23 | 166 |
| Brooklyn Friends | 7 | 47 |
| Brooklyn Heights Montessori | 2 | 4 |
| Browning | 15 | 69 |
| Buckley | 5 | 67 |
| Buckley Country Day | 1 | 7 |
| Calhoun | 9 | 66 |
| Cardinal Spellman | 1 | |
| Cathedral | 1 | 28 |
| Chapin | 13 | 123 |
| City & Country | 6 | |
| Collegiate | 19 | 165 |
| Columbia Prep | 16 | 102 |
| Dalton | 23 | 165 |
| Dwight School | 4 | 6 |
| Dwight-Englewood | 19 | 15 |
| Fieldston | 14 | 172 |
| Friends | 9 | 86 |
| Grace Church | 7 | 88 |
| Hackley | 8 | 49 |
| Hewitt | 3 | 49 |
| Horace Mann | 35 | 248 |
| ISB | 2 | 3 |
| Kew-Forest | 2 | 24 |
| Léman | 20 | |
| Loyola | 4 | |
| LREI | 7 | 69 |
| Mandell | 17 | |
| Manhattan Country | 24 | |
| Marymount | 6 | 32 |
| Nightingale | 12 | 128 |
| Packer | 13 | 119 |
| Poly Prep | 51 | 251 |
| Riverdale | 7 | 112 |
| Rudolf Steiner | 4 | |
| Rye Country Day School | 4 | 62 |
| Sacred Heart | 5 | 44 |
| Saint Ann's | 7 | 111 |
| Saint David's | 3 | 75 |
| Spence | 22 | 113 |
| Speyer | 3 | 7 |
| St. Bernard's | 3 | 89 |
| Staten Island Academy | 9 | |
| St. Hilda's & St. Hugh's | 4 | |
| St. Luke's | 4 | 68 |
| Town | 2 | 107 |
| Trevor Day | 10 | 33 |
| Trinity | 36 | 304 |
| VCS | 1 | 77 |
| Xavier | 1 | 4 |
| York Prep | 3 | 16 |
| Other Schools* | 24 |
| Enrolled | Graduated | |
| PREP 9 Consortium Schools | ||
| Andover | 20 | 179 |
| Choate | 13 | 148 |
| Deerfield | 15 | 126 |
| Exeter | 25 | 197 |
| Hill | 12 | 49 |
| Hotchkiss | 14 | 114 |
| Lawrenceville | 9 | 109 |
| Loomis Chaffee | 5 | 51 |
| Middlesex | 10 | 76 |
| Milton | 8 | 90 |
| St. Andrew's | 12 | 83 |
| Taft | 12 | 122 |
| Other Boarding Schools | ||
| Berkshire | 4 | |
| Blair | 10 | |
| Canterbury | 16 | |
| Cardigan | 7 | |
| Cheshire | 1 | 1 |
| Church Farm | 3 | 17 |
| Concord | 6 | 13 |
| Dana Hall | 3 | 1 |
| Eaglebrook | 12 | |
| Emma Willard | 16 | |
| Ethel Walker | 1 | 8 |
| Fay | 1 | 28 |
| Fessenden | 8 | |
| Frederick Gunn School | 3 | 4 |
| George | 2 | 3 |
| Groton | 4 | 17 |
| Harvey | 2 | 0 |
| Indian Mountain | 7 | |
| Kent | 13 | |
| Millbrook | 2 | 8 |
| Miss Hall's | 2 | 4 |
| Miss Porter's | 13 | |
| NMH | 1 | 14 |
| Oakwood Friends | 1 | 3 |
| Oldfields | 7 | |
| Peddie | 11 | |
| Pingry | 1 | 1 |
| 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 | 3 | 4 |
| Westtown | 6 | |
| Williston | 4 | 17 |
| Winchedon | 1 | |
| Other Schools* | 34 |