Colonel Zadok A. Magruder High School (#510) is a secondary public school located in Rockville, Maryland. Magruder is named for Colonel Zadok Magruder, a Revolutionary War patriot and farmer. He was colonel in command of part of the Maryland militia and helped establish Montgomery County's government in 1776. The school is called simply "Magruder" by its students. The school first opened in 1970 at 149,533 sq ft, with 8th, 9th and 10th graders.