Founding year: 1956
Address: St. Francis High School, 2130 W. Roosevelt Road, Wheaton, Illinois, 60187, United States
Founding year: 1956
Address: Flint Hill School, 3320 Jermantown Rd, Oakton,, Virginia, 22124, United States
Founding year: 1956
Address: The Awty International School, 7455 Awty School Lane Houston, Texas, 77055, United States
Founding year: 1956
Address: Jesuit High School, 9000 SW Beaverton-Hillsdale Hwy. Portland,, Oregon, 97225, United States
Founding year: 1956
Address: The Marvelwood School, 476 Skiff Mountain Rd. Kent, Connecticut, 06757, United States
Founding year: 1956
Address: La Salle High School, 3880 E Sierra Madre Blvd Pasadena, , California, 91107, United States
Founding year: 1956
Address: Saint Louis Priory School, 500 South Mason Road St. Louis,, Missouri, 63141, United States
Founding year: 1956
Address: Cor Jesu Academy, 10230 Gravois Rd, St. Louis,, Missouri, 63123, United States
Founding year: 1955
Address: St. Francis High School, 1885 Miramonte Avenue Mountain View, California, 94040, United States
Founding year: 1955
Address: Webb School of Knoxville, 9800 Webb School Drive, Knoxville, Tennessee, 37923, United States
Founding year: 1955
Address: Albuquerque Academy, 6400 Wyoming Blvd NE ABQ, New Mexico, 87109, United States
Founding year: 1955
Address: Bergen Catholic High School, 1040 Oradell Ave, Oradell, , New Jersey, 07649, United States
Founding year: 1955
Address: Rochambeau The French International School, 9600 Forest Road, Bethesda, Maryland, 20814, United States
Founding year: 1955
Address: Saint George's School, 372 Purgatory Rd, Middletown, Rhode Island, 99208-9209, United States
Founding year: 1955
Address: Saint James School, 17641 College Rd, Hagerstown, Alabama, 36116, United States
Founding year: 1954
Address: Milo Adventist Academy, 324 Milo Dr, Days Creek, Alabama, 97429, United States
Founding year: 1954
Address: Glenelg Country School, 12793 Folly Quarter Rd, Ellicott City,, Maryland, 21042, United States
Founding year: 1954
Address: Rancho Solano Preparatory School, 9180 E Via de Ventura Scottsdale, Arizona, 85258, United States
Founding year: 1953
Address: Trinity High School, 4011 Shelbyville Rd, Louisville, Kentucky, 40207, United States
Founding year: 1953
Address: Mount Michael Benedictine School, 22520 Mount Michael Road Elkhorn, , Nebraska, 68022, United States
Founding year: 1953
Address: Fairmont Preparatory Academy, 2200 W Sequoia Ave, Anaheim, , California, 92801, United States
Founding year: 1953
Address: Colorado Rocky Mountain School, 500 Holden Way, Carbondale,, Colorado, 81623, United States
Founding year: 1952
Address: St. Andrew's Episcopal School, 8804 Postoak Rd, Potomac, Maryland, 78705, United States
Founding year: 1952
Address: Whitfield School, 175 S Mason Rd, St. Louis, Missouri, 63141, United States
Founding year: 1952
Address: Stevenson School, 3152 Forest Lake Rd Pebble Beach, California, 93953, United States
Founding year: 1952
Address: Harbert Hills Academy, 45 Rural Ln, Savannah, Alabama, 38372, United States
Founding year: 1952
Address: Indian Springs School, 190 Woodward Drive Indian Springs,, Alabama, 35124-3272, United States
Founding year: 1952
Address: Chaminade College Preparatory, 7500 Chaminade Ave, West Hills,, California, 91304, United States
Founding year: 1951
Address: All Saints' Episcopal School, 9700 Saints Circle, Fort Worth, Texas, 76108, United States
Founding year: 1951
Address: Brookstone School, 440 Bradley Park Dr, Columbus,, Georgia, 31904, United States
Founding year: 1951
Address: Marist Brothers International School, 1-2-1 Chimori-cho, Suma-ku, Kobe, Alabama, 654-0072, United States
Founding year: 1950
Address: Greenhill School, 11600 WELCH RD, DALLAS,, Texas, 75001, United States
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