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 |
|---|---|
| Poolesville High School | 18 |
| Thomas S. Wootton High School | 18 |
| Montgomery Blair High School | 18 |
| Northwest High School | 17 |
| Eleanor Roosevelt High School | 15 |
| Winston Churchill High School | 15 |
| Richard Montgomery High School | 14 |
| Mount Hebron High School | 13 |
| Eastern Technical High School | 10 |
| South River High School | 10 |
| River Hill High School | 10 |
| Urbana High School | 9 |
| Walt Whitman High School | 8 |
| Sherwood High School | 8 |
| Dulaney High School | 8 |
| Centennial High School | 7 |
| Wheaton High School | 7 |
| Howard High School | 7 |
| Rockville High School | 7 |
| Aberdeen High School | 7 |
| Damascus High School | 7 |
| Severna Park Senior High School | 6 |
| Walter Johnson High School | 6 |
| Glenelg High School | 6 |
| Reservoir High School | 6 |
* Data collected July 1, 2019.
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