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 | 23 |
| Thomas S. Wootton High School | 22 |
| Eleanor Roosevelt High School | 21 |
| Montgomery Blair High School | 21 |
| Northwest High School | 15 |
| Urbana High School | 14 |
| Atholton High School | 13 |
| Richard Montgomery High School | 12 |
| C. Milton Wright High School | 11 |
| Walt Whitman High School | 11 |
| Walter Johnson High School | 11 |
| Winston Churchill High School | 11 |
| Archbishop Spalding High School | 10 |
| Colonel Zadok A. Magruder High School | 10 |
| River Hill High School | 10 |
| Quince Orchard High School | 9 |
| Reservoir High School | 9 |
| Centennial High School | 8 |
| Clarksburg High School | 8 |
| Dulaney High School | 8 |
| Glenelg High School | 8 |
| Howard High School | 8 |
| Pikesville High School | 8 |
| Severna Park High School | 8 |
| South River High School | 8 |
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