In the 1940s, population in the area boomed and more people moved to the district, which made the enrollment grow quickly.

In 1948 Fitzgerald Junior-Senior High School opened Unit A with nine classrooms, a cafeteria, a library and offices.

Unit B was added to the Junior-Senior High School with 16 classrooms and football and track area.

Another large addition to Fitzgerald Junior-Senior High School was opened, including a new library, gym, and cafeteria.

Enrollment hit another new high of 4714 in September 1963, which led to the opening of many schools around the area.

In 2004 the athletic fields were updated and the old auto shop demolished to make way for future expansion.

The Fitzgerald high school concert bands are currently directed by Katrina O'Higgins.

The Fitzgerald Spartan Marching Band is directed by O'Higgins with Assistant Director Honher.

There have only been five concert band directors in the history of Fitzgerald High School: The music and lyrics for the alma mater "Blue and Gold" and the Fitzgerald Fight Song were composed by director Tauno Luoma.

The Fight Song and Alma Mater were later arranged for modern instrumentation by John Smith in the 1990s.