The school is also home to the naval Junior Reserve Officers' Training Corps for Frederick County (NJROTC).

The building has 292,940 square feet (27,215 m2) of space located on 40 acres (16 ha) of land.

Thomas Johnson High has around 1,850 students and the demographics were as follows for 2021-2022 year [7] 30.5% White 23.7% African American 35.1% Hispanic 4.7% Multiracial Thomas Johnson's graduation rate steadily rose throughout the late 1990s and early 2000s.

[10] AFA, as it is called, offers various college level classes pertaining to the arts for students in 10th, 11th, and 12th grade.

[11] The Naval Junior Reserve Officers' Training Corps was a new addition to GTJHS for the 2015–16 school year.