Founding year: 1934
Address: The Grove School, 175 Copse Rd Madison, Connecticut, 06443, United States
Founding year: 1934
Address: Rocky Hill School, 530 Ives Rd, East Greenwich,, Rhode Island, 02818, United States
Founding year: 1933
Address: Durham Academy, 3116 Academy Rd, Durham, , North Carolina, 27705, United States
Founding year: 1933
Address: Villa Victoria Academy, 376 West Upper Ferry Road Ewing, New Jersey, 08628, United States
Founding year: 1933
Address: Flintridge Preparatory School, 4543 Crown Avenue La Cañada Flintridge, California, 91011, United States
Founding year: 1933
Address: Admiral Farragut Academy, 501 Park Street North, St. Petersburg, Florida, 33710, United States
Founding year: 1933
Address: The Bolles School, 7400 San Jose Blvd Jacksonville, Florida, 32217, United States
Founding year: 1933
Address: The Buckley School, 3900 Stansbury Ave. Sherman Oaks, California, 91423, United States
Founding year: 1933
Address: The Harvey School, 260 Jay Street, Katonah, New York, 10536, United States
Founding year: 1933
Address: Laguna Blanca School, 4125 Paloma Dr, Santa Barbara, , California, 93110, United States
Founding year: 1933
Address: Marmion Academy, 1000 Butterfield Rd, Aurora, Alabama, 60502, United States
Founding year: 1932
Address: Midland School, 5100 Figueroa Mountain Rd,, California, 93441, United States
Founding year: 1932
Address: Archmere Academy, 3600 Philadelphia Pike, Claymont, Delaware, 19703, United States
Founding year: 1932
Address: The Darrow School, 110 Darrow Road New Lebanon, New York, 12125, United States
Founding year: 1932
Address: Sandia Preparatory School, 532 Osuna Rd. NE, Albuquerque, New Mexico, 87113, United States
Founding year: 1931
Address: Mayfield Senior School, 500 Bellefontaine St Pasadena, , California, 91105, United States
Founding year: 1931
Address: Flintridge Sacred Heart Academy, 440 St. Katherine Drive La Cañada Flintridge,, California, 91011, United States
Founding year: 1930
Address: Trevor Day School, 312 E 95th St NY, New York, 10128, United States
Founding year: 1930
Address: Fountain Valley School of Colorado, 6155 Fountain Valley School Rd, Colorado Springs, , Colorado, 80911, United States
Founding year: 1930
Address: Forman School, 12 Norfolk Rd, Litchfield, , Connecticut, 06759, United States
Founding year: 1930
Address: The Bullis School, 10601 Falls Road, Potomac, Maryland, 20854, United States
Founding year: 1930
Address: Chaminade High School, 340 Jackson Ave., Mineola, , New York, 11501, United States
Founding year: 1930
Address: Sanford School, 6900 Lancaster Pike, Hockessin, Delaware, 19707, United States
Founding year: 1930
Address: The Tatnall School, 1501 Barley Mill Road Wilmington, Delaware, 19807, United States
Founding year: 1929
Address: St. Andrew's School, 350 Noxontown Road, Middletown, Delaware, 19709, United States
Founding year: 1929
Address: Villa Duchesne & Oak Hill School, 801 South Spoede Road, Saint Louis, Missouri, 63131, United States
Founding year: 1929
Address: Metairie Park Country Day School, 300 Park Road, Metairie,, Louisiana, 70005, United States
Founding year: 1929
Address: Fenwick High School, 505 Washington Blvd, Oak Park,, Illinois, 60302, United States
Founding year: 1929
Address: St.Andrew's School, 350 Noxontown Rd Middletown, Delaware, 19709, United States
Founding year: 1929
Address: Landon School, 6101 Wilson Lane Bethesda,, Maryland, 20817, United States
Founding year: 1929
Address: The Leelanau School, One Old Homestead Road, Glen Arbor, Michigan, 49636, United States
Founding year: 1929
Address: The Orme School, 1000 E. Orme School Road, Mayer, Alabama, 86333, United States
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