The listing below identifies the 25* Maryland high schools that send the most students to the Clark School.
| Name of High School | Number of Students |
|---|---|
| Montgomery Blair High School | 18 |
| Thomas Sprigg Wootton High School | 18 |
| Winston Churchill High School | 16 |
| River Hill High School | 15 |
| Quince Orchard High School | 14 |
| Richard Montgomery High School | 13 |
| Urbana High School | 12 |
| Dulaney High School | 11 |
| Poolesville High School | 11 |
| Walter Johnson High School | 11 |
| Centennial High School | 9 |
| Eleanor Roosevelt High School | 9 |
| Glenelg High School | 9 |
| Severna Park Senior High School | 9 |
| Marriotts Ridge High School | 8 |
| Walt Whitman High School | 8 |
| Clarksburg High School | 7 |
| South River High School | 7 |
| Archbishop Spalding High School | 6 |
| Arundel Senior High School | 6 |
| Calvert Hall College High School | 6 |
| Damascus High School | 6 |
| Hammond High School | 6 |
| Howard High School | 6 |
| Our Lady of Good Counsel High School | 6 |
| Towson High School | 6 |
* Note that, owing to ties, there are 26 schools listed.
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