| Worcester Academy | Massachusetts |
| Woodberry Forest School | Virginia |
| The Winsor School | Massachusetts |
| Wilmington Friends School | Delaware |
| William Penn Charter School | Pennsylvania |
| Whitfield School | Missouri |
| The Wheeler School | Rhode Island |
| Westtown School | Pennsylvania |
| Westridge School for Girls | California |
| Westover School | Connecticut |
| The Westminster Schools | Georgia |
| Westchester Country Day School | North Carolina |
| The Wellington School | Ohio |
| The Webb Schools | California |
| Webb School of Knoxville | Tennessee |
| The Wardlaw-Hartridge | New Jersey |
| The Walker School | Georgia |
| Viewpoint School | California |
| Vermont Academy | Vermont |
| Ursuline Academy of Dallas | Texas |
| University School of Nashville | Tennessee |
| University School | Florida |
| University Prep | Washington |
| University Liggett School | Michigan |
| University High School of Indiana | Indiana |
| Trinity Valley School | Texas |
| Trinity Preparatory School | Florida |
| Trinity School | New York |
| Pingree School | Massachusetts |
| The Hill School | Pennsylvania |
| Thayer Academy | Massachusetts |
| The Thacher School | California |
| The Taft School | Connecticut |
| Suffield Academy | Connecticut |
| Stuart Hall High School | California |
| St. Mark;s School of Texas | Texas |
| St. Gregory College Preparatory School | Arizona |
| St. Andrew's School - Deleware | Delaware |
| St. Andrew's School | Delaware |
| St, Andrew's Episcopal School | Maryland |
| Sidwell Friends | District of Columbia |
| The Shipley School | Pennsylvania |
| Shady Side Academy | Pennsylvania |
| Sewickley Academy | Pennsylvania |
| Severn School | Maryland |
| Sanford School | Delaware |
| Sandy Spring Friends School | Maryland |
| Sandia Preparatory School | New Mexico |
| San Francisco University School | California |
| St. Timothy's School | Maryland |
| St. Stephen's Episcopal School | Texas |
| St. Paul's School (Maryland) | Maryland |
| St. Paul's School (New Hampshire) | New Hampshire |
| St. Paul Academy & Summit School | Minnesota |
| Saint Mary's School | North Carolina |
| St. Mary's Episcopal School | Tennesee |
| St. Margaret's Episcopal School | California |
| Saint James School | Maryland |
| St. George's School | Rhode Island |
| Saint George's School | Washington |
| Saint Edward's School | Florida |
| St. Christopher's School | Virginia |
| St. Andrew's School | Georgia |
| Saint Andrew's School | Florida |
| St. Albans School | District of Columbia |
| Sage Ridge School | Nevada |
| Rye Country Day School | New York |
| Roxbury Latin School | Massachusetts |
| Rowland Hall | Utah |
| Roland Park Country School | Maryland |
| Ravenscroft School | North Carolina |
| Ransom Everglades School | Florida |
| Ranney School | New Jersey |
| Randolph School | Alabama |
| Rabun Gap-Nacoochee School | Georgia |
| Providence Day School | North Carolina |
| Potomac School | Virginia |
| Portsmouth Abbey School | Rhode Island |
| Pomfret School | Connecticut |
| Polytechnic School | California |
| Poly Prep Country Day School | New York |
| The Pingry School | New Jersey |
| The Pingree School | Massachusetts |
| The Pine School | Florida |
| Pine Crest School | Florida |
| Phoenix Country Day School | Arizona |
| Phillips Exeter Academy | New Hampshire |
| Phillips Academy Andover | Massachusetts |
| Pembroke Hill School | Missouri |
| Park Tudor School | Indiana |
| The Park School of Baltimore | Maryland |
| Palmer Trinity School | Florida |
| Pacific Ridge School | California |
| Pace Academy | Georgia |
| The Overlake School | Washington |
| Oregon Episcopal School | Oregon |
| Oakwood School | California |
| The Oakwood School | North Carolina |
| The Oakridge School | Texas |
| The Northwest School | Washington |
| North Shore Country Day School | Illinois |
| Norfolk Academy | Virginia |
| Noble and Greenough School | Massachusetts |
| New Hampton School | New Hampshire |
| National Cathedral School | District of Columbia |
| Morristown-Beard School | New Jersey |
| Montgomery Bell Academy | Tennessee |
| Miss Porter's School | Connecticut |
| Miss Hall's School | Massachusetts |
| Milton Academy | Massachusetts |
| Millbrook School | New York |
| Millbrook School | New York |
| Midland School | California |
| Middlesex School | Massachusetts |
| The Miami Valley School | Ohio |
| Miami Country Day School | Florida |
| Menlo School | California |
| McLean School | Maryland |
| McDonogh School | Maryland |
| McCallie School | Tennessee |
| Maumee Valley Country Day School | Ohio |
| The Masters School | New York |
| Marymount School | New York |
| Mary Institute and Saint Louis Country Day School | Missouri |
| Marlborough School | California |
| Marist School | Georgia |
| Maret School | District of Columbia |
| Manlius Pebble Hill School | New York |
| Maine Central Institute | Maine |
| Madeira School | Virginia |
| Lycee Francais de New York | New York |
| The Lovett School | Georgia |
| Loomis Chaffee | Connecticut |
| The Linsly School | West Virginia |
| Lincoln School | Rhode Island |
| Lawrenceville School | New Jersey |
| Lawrence Academy | Massachusetts |
| Laurel School | Ohio |
| Latin School of Chicago | Illinois |
| Landon School | Maryland |
| Lakeside School | Washington |
| Lake Highland Preparatory School | Florida |
| The Kiski School | Pennsylvania |
| The Kinkaid School | Texas |
| King & Low-Heywood Thomas School | Connecticut |
| Kimball Union Academy | New Hampshire |
| The Key School | Maryland |
| Kent School | Connecticut |
| Boston University Academy | Massachusetts |
| The John Cooper School | Texas |
| John Burroughs School | Missouri |
| Jackson Preparatory School | Mississippi |
| Isidore Newman School | Louisiana |
| Indian Springs School | Alabama |
| The Hyde Schools | Maine |
| Hutchinson School | Tennessee |
| The Hun School of Princeton | New Jersey |
| The Hotchkiss School | Connecticut |
| Holy Innocents' Episcopal School | Georgia |
| The Holton-Arms School | Maryland |
| The Hockaday School | Texas |
| Head-Royce School | California |
| Hawken School | Ohio |
| The Haverford School | Pennsylvania |
| Hathaway Brown School | Ohio |
| Harvard-Westlake School | California |
| The Harpeth Hall School | Tennessee |
| The Harker School | California |
| Hackley School | New York |
| The Gunnery | Connecticut |
| Groton School | Massachusetts |
| Greenwich Academy | Connecticut |
| Greens Farms Academy | Connecticut |
| Greenhill School | Texas |
| The Good Hope School | Virgin Islands |
| Girls Preparatory School | Tennessee |
| Gilman School | Maryland |
| Georgetown Day School | District of Columbia |
| Garrison Forest School | Maryland |
| The Galloway School | Georgia |
| Friends' Central School | Pennsylvania |
| Friends Seminary | New York |
| Friends School of Baltimore | Maryland |
| Friends Academy | New York |
| Franklin Road Academy | Tennessee |
| Francis W. Parker School | Illinois |
| Francis Parker School | California |
| Foxcroft School | Virginia |
| Fountain Valley School of Colorado | Colorado |
| Fort Worth Country Day | Texas |
| Forsyth Country Day School | North Carolina |
| Flintridge Preparatory School | California |
| Flint Hill School | Virginia |
| Flint Hill School | Virginia |
| Episcopal School of Acadiana | Louisiana |
| Episcopal School of Dallas | Texas |
| Episcopal High School | Virginia |
| The Episcopal Academy | Pennsylvania |
| The Ensworth School | Tennessee |
| The Emery Weiner School | Texas |
| The Ellis School | Pennsylvania |
| Eagle Hill School | Massachusetts |
| Dunn School | California |
| Derryfield School | New Hampshire |
| Darlington School | Georgia |
| Dana Hall School | Massachusetts |
| Cushing Academy | Massachusetts |
| Crystal Springs Uplands School | California |
| Concord Academy | Massachusetts |
| Community School of Naples | Florida |
| Columbus School for Girls | Ohio |
| The Columbus Academy | Ohio |
| Colorado Academy | Colorado |
| Collegiate School, Richmond, VA | Virginia |
| Cincinnati Country Day School | Ohio |
| Choate Rosemary Hall | Connecticut |
| Chestnut Hill Academy | Pennsylvania |
| Chase Collegiate School | Connecticut |
| Charles Wright Academy | Washington |
| Charles E. Smith Jewish Day School | Maryland |
| Cate School | California |
| Castilleja School | California |
| Casady School | Oklahoma |
| Cape Henry Collegiate School | Virginia |
| Cannon School | North Carolina |
| The Bush School | Washington |
| Bullis School | Maryland |
| The Buckley School | California |
| The Bryn Mawr School | Maryland |
| Brooks School | Massachusetts |
| The Brimmer and May School | Massachusetts |
| Breck School | Minnesota |
| The Boys' Latin School of Maryland | Maryland |
| Boston University Academy | Massachusetts |
| The Bolles School | Florida |
| Blair Academy | New Jersey |
| The Bishop's School | California |
| The Benjamin School | Florida |
| Belmont Hill School | Massachusetts |
| Beaver Country Day School | Massachusetts |
| Baylor School | Tennessee |
| The Awty School | Texas |
| Augusta Preparatory Day School | Georgia |
| Athens Academy | Georgia |
| Antilles School | Virgin Islands |
| The Athenian School | California |
| Annie Wright School | Washington |
| The Altamont School | Alabama |
| Alexander Dawson School | Colorado |
| The Agnes Irwin School | Pennsylvania |
| The Adelson School | Nevada |
