Founding year: 1920
Address: The Nightingale-Bamford School, 20 E 92nd St New York,, New York, 10128, United States
Founding year: 1919
Address: North Shore Country Day School, 310 Green Bay Rd Winnetka,, Illinois, 60093-4094, United States
Founding year: 1919
Address: Saint Thomas Choir School, 202 West 58th Street, New York, 10019, United States
Founding year: 1919
Address: Tower Hill School, 2813 W. 17th Street, Wilmington, Delaware, 19806, United States
Founding year: 1918
Address: Gem State Adventist Academy, 16115 S Montana Ave, Caldwell, , Idaho, 83607, United States
Founding year: 1918
Address: Hillcrest Lutheran Academy, 610 HILLCREST DRIVE, FERGUS FALLS,, Minnesota, 56537, United States
Founding year: 1918
Address: The Kew-Forest School, 119-17 Union Turnpike Forest Hills, New York, 11375, United States
Founding year: 1918
Address: Cathedral High School, 5225 E 56th Street Indianapolis, , Indiana, 46226, United States
Founding year: 1918
Address: Church Farm School, 1001 E. Lincoln Hwy, Exton,, Pennsylvania, 19341, United States
Founding year: 1917
Address: St. Catherine's School, 6001 Grove Avenue, Richmond, Virginia, 23226, United States
Founding year: 1917
Address: The Harley School, 1981 Clover Street Rochester, New York, 14618, United States
Founding year: 1916
Address: Virginia Episcopal School, 400 VES Road, Lynchburg, Virginia, 24503, United States
Founding year: 1916
Address: The Ellis School, 6425 Fifth Avenue Pittsburgh, Pennsylvania, 15206, United States
Founding year: 1916
Address: Iona Preparatory School, 255 Wilmot Road, New Rochelle, , New York, 10804, United States
Founding year: 1916
Address: Keith Country Day School, 1 Jacoby Pl, Rockford,, Illinois, 61107, United States
Founding year: 1915
Address: Menlo School, 50 Valparaiso Avenue Atherton,, California, 94027, United States
Founding year: 1915
Address: Hawken School, 12465 County Line Rd Gates Mills, , Ohio, 44124, United States
Founding year: 1915
Address: Roycemore School, 1200 Davis Street Evanston,, Illinois, 60201, United States
Founding year: 1915
Address: Canterbury School, 101 Aspetuck Ave, New Milford, , Connecticut, 06776, United States
Founding year: 1915
Address: The Rivers School, 333 Winter Street Weston, Massachusetts, 02493, United States
Founding year: 1915
Address: Louisville Collegiate School, 2427 Glenmary Ave Louisville, , Kentucky, 40204, United States
Founding year: 1915
Address: Collegiate School, 103 N. Mooreland Road, Richmond, , Virginia, 23229, United States
Founding year: 1914
Address: Severn School, US, Maryland, 21012, United States
Founding year: 1914
Address: Foxcroft School, 22407 Foxhound Lane, Middleburg,, Virginia, 20117, United States
Founding year: 1914
Address: Professional Children's School, 132 W 60th St New York, New York, 10023, United States
Founding year: 1914
Address: The Hun School of Princeton, 176 Edgerstoune Road, Princeton, New Jersey, 08540, United States
Founding year: 1914
Address: Regis High School, 55 E 84th St New York, New York, 10028, United States
Founding year: 1914
Address: Rockhurst High School, 9301 State Line Road, Kansas City,, Missouri, 64114, United States
Founding year: 1914
Address: The Loomis Chaffee School, 4 Batchelder Rd Windsor, Connecticut, 06095, United States
Founding year: 1913
Address: Minnehaha Academy, 3100 W River Pkwy, Minneapolis, Alabama, 55406, United States
Founding year: 1913
Address: Westridge School, 324 Madeline Drive, Pasadena, California, 91105, United States
Founding year: 1913
Address: The Hockaday School, 11600 Welch Rd, Dallas, Texas, 75229, United States
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