Founding year: 1924
Address: The Bush School, 3400 E Harrison St Seattle, Washington, 98112, United States
Founding year: 1924
Address: Canyonville Academy, 250 E 1st St, Canyonville,, Oregon, 97417, United States
Founding year: 1924
Address: Lexington Catholic High School, 2250 Clays Mill Road, Lexington, , Kentucky, 40503, United States
Founding year: 1924
Address: The Out-of-Door Academy, 444 Reid St Sarasota, Florida, 34240, United States
Founding year: 1923
Address: Marymount High School, 10643 Sunset Blvd, Los Angeles, Alabama, 90077, United States
Founding year: 1923
Address: South Kent School, 40 Bulls Bridge Road South Kent, Connecticut, 06785, United States
Founding year: 1923
Address: St. Charles Preparatory School, 2010 E Broad St. Columbus, Ohio, 43209, United States
Founding year: 1923
Address: Stone Ridge School of the Sacred Heart, 9101 Rockville Pike, Bethesda, Maryland, 20814, United States
Founding year: 1923
Address: Belmont Hill School, 350 Prospect St, Massachusetts, 02478, United States
Founding year: 1923
Address: Our Lady of the Elms, 1375 W Exchange St, Akron, , Ohio, 44313, United States
Founding year: 1923
Address: John Burroughs School, 755 South Price Road, St. Louis, , Alabama, 63124, United States
Founding year: 1923
Address: Covington Latin School, 21 E 11th St, Covington,, Kentucky, 41011, United States
Founding year: 1923
Address: The Providence Country Day School, 660 Waterman Avenue East Providence, Rhode Island, 02914, United States
Founding year: 1923
Address: Shorecrest Preparatory School, 5101 First Street Northeast St Petersburg, Florida, 33703, United States
Founding year: 1922
Address: St. Augustine High School, 3266 Nutmeg Street San Diego, California, 92104, United States
Founding year: 1922
Address: Eaglebrook School, 271 Pine Nook Rd, Deerfield, , Massachusetts, 01342, United States
Founding year: 1922
Address: Holland Hall, 5666 E 81st St, Tulsa, , Oklahoma, 74137, United States
Founding year: 1922
Address: Indian Mountain School, 211 Indian Mountain Rd, Lakeville, , Connecticut, 06039, United States
Founding year: 1922
Address: Kent Denver School, 4000 East Quincy Avenue Englewood, , Colorado, 80113, United States
Founding year: 1922
Address: Cranbrook Schools, 39221 Woodward Ave, Bloomfield Hills, Michigan, 48304, United States
Founding year: 1922
Address: The Webb Schools, 1175 W. Baseline Road Claremont, California, 91711, United States
Founding year: 1922
Address: Concord Academy, 166 Main St, Concord, , Massachusetts, 01742, United States
Founding year: 1922
Address: The Stony Brook School, 1 Chapman Parkway, Stony Brook, New York, 11790, United States
Founding year: 1921
Address: Union Springs Academy, 40 Spring Street Union Springs, New York, 13160, United States
Founding year: 1921
Address: St. Margaret's School, P.O. Box 158 Tappahannock, Virginia, 22560, United States
Founding year: 1921
Address: Judge Memorial Catholic High School, 650 South 1100 East, LLC Series #107, Salt Lake City, Utah, 84102, United States
Founding year: 1921
Address: Christchurch School, 49 Seahorse Lane, Christchurch,, Virginia, 23031, United States
Founding year: 1920
Address: Upper Columbia Academy, 3025 E. Spangle-Waverly Rd Spangle, Washington, 99031, United States
Founding year: 1920
Address: Beaver Country Day School, Beaver Drive, Chestnut Hill, Newton, Massachusetts, 02467, United States
Founding year: 1920
Address: Bentley School, 1 Hiller Dr, Oakland, Alabama, 94618, United States
Founding year: 1920
Address: Rectory School, 528 Pomfret Street, Pomfret, Connecticut, 06258, United States
Founding year: 1920
Address: The Hewitt School, 45 East 75th Street, NY, New York, 10021, United States
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