District of Columbia 

DC Flag

Aidan Montessori School  National Child Research Center
Beauvoir, the National Cathedral 
Elementary School
 National Presbyterian School
 Bishop John T. Walker School for Boys  Parkmont School

 Capitol Hill Day School

 The River School
 Edmund Burke School San Miguel School
 The Field School Sheridan School
 Georgetown Day School Sidwell Friends School
 Georgetown Visitation Preparatory Day School St. Albans School
 Gonzaga College High School St. Anselm's Abbey School
Milton Gottesman Jewish Primary School
of the Nation’s Capital
St. Columba's Nursery School
 The Lab School of Washington St. John's College High School
 Little Folks School St. Patrick's Episcopal Day School
 Lowell School  The Washington School for Girls
 Maret School   Washington International School
 National Cathedral School  Washington Jesuit Academy

  Maryland

MD Flag

 The Academy of the Holy Cross The Harbor School  

Alef Bet Montessori School 

 The Heights School
Barrie School  Holton-Arms School 
Bishop McNamara High School Landon School 
Bullis School  Mater Dei School 
 Butler Montessori McLean School 
Charles E. Smith Jewish Day School  The Nora School 
Concord Hill School  Norwood School 
Connelly School of the Holy Child  The Primary Day School 
The Diener School  Sandy Spring Friends School
Evergreen School  Sidwell Friends (Lower) School  
Friends Community School St. Andrew's Episcopal School 
Georgetown Preparatory School  Stone Ridge School of the Sacred Heart 
German International School Washington, D.C.  The Tidewater School
Grace Episcopal Day School  The Woods Academy 
Green Acres School Washington Episcopal School 
  Washington Waldorf School 

Virginia

VA Flag  

Burgundy Farm Country Day School
 The Hill School
Commonwealth Academy
The Langley School 
Congressional School Loudoun Country Day School 
Episcopal High School 
The Madeira School 
Flint Hill School Oakwood School 
Foxcroft School The Potomac School
Grace Episcopal School St. Stephen's and St. Agnes School
Green Hedges School Westminster School