- American International School of Bucharest – Bucharest, Romania
- Annapolis Area Christian School – Annapolis, MD
- Anne Arundel County International Baccalaureate Program – Annapolis, MD
- Anne Arundel County Science Technology Engineering Mathematics (STEM) Program – Annapolis, MD
- Archbishop Spalding High School – Severn, MD
- Bishop McNamara High School – Forestville, MD
- Bryn Mawr School – Baltimore, MD
- The Calverton School – Huntingtown, MD
- Christchurch School – Christchurch, VA
- The Covenant School – Charlottesville, VA
- Dana Hall – Wellesley, MA
- DeMatha Catholic High School – Hyattsville, MD
- Episcopal High School -- Alexandria, VA
- Friends School of Baltimore – Baltimore, MD
- Garrison Forest School – Owings Mills, MD
- Gilman School – Baltimore, MD
- Gonzaga College High School – Washington, D.C.
- The Grier School – Tyrone, PA
- Gunston Day School – Centreville, MD
- Holton-Arms School – Bethesda, MD
- Indian Creek School – Crownsville, MD
- Institute of Notre Dame – Baltimore, MD
- The Key School – Annapolis, MD
- Lake Highland Prep School – Orlando, FL
- Loyola Blakefield – Baltimore, MD
- Lutheran South Academy – Houston, TX
| - Madeira School – McLean, VA
- McDonogh School – Owings Mills, MD
- Mt. St. Joseph’s High School – Catonsville, MD
- New Mexico Military Academy – Roswell, NM
- Our Lady of Good Counsel High School – Olney, MD
- Prince George's County Science Technology Engineering Mathematics (STEM) Program
- Proctor Academy - Andover, NH
- Queen Anne School – Upper Marlboro, MD
- Saint James School – St. James, MD
- St. Alban’s School – Washington, D.C.
- St. Andrew’s School – Middletown, DE
- St. Anselm’s Abbey School – Washington, D.C.
- St. John's College High School – Washington, D.C.
- St. Mary’s High School – Annapolis, MD
- Sts. Peter & Paul High School – Easton, MD
- St. Timothy’s School – Stevenson, MD
- Seton Keogh High School – Baltimore, MD
- Severn School – Severna Park, MD
- Tabor Academy – Marion, MA
- Windermere Preparatory School – Windermere, FL
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