The listing below identifies 25 Maryland high schools that send the most students to the Clark School.

In alphabetical order, the schools are:

• Arundel Senior High School
• Atholton High School
• Broadneck Senior High School
• Calvert Hall College High School
• Centennial High School
• Winston Churchill High School
• Damascus High School
• Glenelg High School
• Huntingtown High School
• Governor Thomas Johnson High School
• Walter Johnson High School
• Montgomery Blair High School
• Richard Montgomery High School
• Mount Hebron High School
• Our Lady of Good Counsel High School
• Poolesville High School
• Quince Orchard High School
• River Hill High School
• Eleanor Roosevelt High School
• Severna Park Senior High School
• Sherwood High School
• South River High School
• Towson High School
• Tuscarora High School
• Urbana High School
• Westminster High School
• Thomas Sprigg Wootton High School

*Note that, owing to ties in 2010-2011, there are 27 schools listed.