Independent School League (12)
Belmont Hill
Brooks
Governor Dummer Academy
Lawrence
Middlesex
Milton Academy
Nobles
Rivers
Roxbury Latin
St. Mark's
St. Paul's
Thayer Academy

Inter-Academic League (6)
Chesnut Hill Academy
Episcopal Academy
Germantown Academy
Haverford School
Malvern Prep
William Penn Charter

Inter-State Prepschool League (5)
Kiski School
Linsly
Shady Side Academy
University School
Western Reserve

Interstate Athletic Conference (7)
Bullis
Episcopal H.S.
Georgetown Prep
Landon
St. Albans
St. Stephens/St. Agnes
Sidwell Friends

Maryland Interscholastic Athletic Association (13)
Annapolis Area Christian School
Archbishop Curley
Archbishop Spalding
Boys Latin
Calvert Hall 
Friends Central
Gilman
John Carroll
Loyola Blakefield
McDonogh
Mount St. Joseph
St. Mary's
St. Paul's

Mid-Atlantic Conference (6)
Georgetown Day
Maret
Mercersburg Academy
Potomac School
St. Andrew's Episcopal
St. James

Philadelphia Catholic League (12)
Archbishop Carroll
Archbishop Wood
Cardinal Dougherty
Cardinal O'Hara
Conwell-Egan
Kennedy-Kenrick
LaSalle H.S.
Monsignor Bonner
Northeast Catholic
St. Joseph's Prep

Tidewater Conference of Independent Schools (6)
Cape Henry Collegiate
Catholic H.S.
Greenbrier Christian
Norfolk Academy
Norfolk Collegiate
Peninsula Catholic

Virginia Prep League (9)                  
Blue Ridge                               
Christ Church                                    
Collegiate                       
Fork Union Military Academy                         
Norfolk Academy                                                                                             
St. Christopher's                                     
Trinity Episcopal
Virginia Episcopal                               
Woodberry Forest

Washington Catholic Athletic Conference (8)  
Bishop Ireton
Bishop McNamara
Bishop O'Connell
DeMatha
Gonzaga
Good Counsel
Palotti
Paul VI