[6][7][8] A 1965 cross burning onsite was an indication of the strained race relations of the era.

Glenelg student body enrollment through the years has fluctuated due to many factors, including new housing construction and redistricting.

In 2021, Glenelg was ranked as the 400th best high school in the nation, 9th best in Maryland, and 2nd best in Howard County, by U.S. News & World Report.

Glenelg's FIRST Robotics Competition Team 888 came in first in 2002 at the Western Michigan Regional[43] and 2022 at the Chesapeake Greater DC regional event [44] On May 24, 2018, Glenelg High School property was defaced with racially-charged hate speech.

[45] The perpetrators spray-painted school property with swastikas and other racially-charged epithets.