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 |
|---|---|
| Richard Montgomery High School | 25 |
| Eleanor Roosevelt High School | 18 |
| Montgomery Blair High School | 17 |
| Thomas Sprigg Wootton Hs | 17 |
| Walter Johnson High School | 17 |
| River Hill High School | 14 |
| Poolesville High School | 13 |
| Winston Churchill High School | 12 |
| Northwest High School | 10 |
| Baltimore Polytechnic Inst | 8 |
| Linganore High School | 8 |
| Walt Whitman High School | 8 |
| Atholton High School | 7 |
| Centennial High School | 7 |
| Glenelg High School | 7 |
| Mount Hebron High School | 7 |
| Quince Orchard High School | 7 |
| Broadneck Senior High School | 6 |
| Colonel Zadok Magruder Hs | 6 |
| Marriotts Ridge High School | 6 |
| Rockville High School | 6 |
| Severna Park Senior Hs | 6 |
| Dulaney High | 5 |
| South River High School | 5 |
| Stephen Decatur High School | 5 |
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