Students were taught at the original brick building until 1910, when a large new school was dedicated to relieve overcrowding.

In 1925, Baltimore County purchased land and buildings from the Catonsville Country Club with the intention of making it the new high school.

The campus was originally the "Farmlands" estate, owned in the 19th century by Theodore Lurman.

[6] Catonsville High School received a 64.5 out of a possible 100 points (64%) on the 2018–2019 Maryland State Department of Education Report Card and received a 4 out of 5 star rating, ranking in the 61st percentile among all Maryland schools.

[1] The graduation rate at Catonsville High School ranged from 94% in 1998 to a low of 83% in 2001.