The first graduating class of Toronto High School was in 1889 with four students. In 1898 the first superintendent of schools, Mr. Abram Grove, organized what is known today as the Toronto Public School System. In 1905, Toronto High School was granted a charter as a First Grade High School and in 1918, the school was given membership in the North Central Association of Colleges and Secondary Schools. The current high school building was erected in 1926, and the latest addition, which provided for the library, cafeteria, the George J. Kunzler Memorial Gymnasium, and additional classrooms was dedicated in April 1940.
Presently, Toronto Junior/Senior High School holds grades 6-12 in a combined facility that opened in September 2013.