Jefferson High School (JHS) opened in 1922 to its first 50 students using the old Jefferson Hall (previously Jefferson Elementary School) near San Pedro Road and Hill Street. Recognizing the need for a more suitable campus to accommodate the rapidly expanding student body, JUHSD residents voted to build a new campus at the current location in 1923. The first building was finished in 1925. Subsequently, this building was demolished and replaced in 1963. In 2000, alumnus
John Madden donated the lighting for the campus football field. They are named "Madden Lights" in his honor. In 2005, Jefferson began a project to renovate and remodel the campus. In 2025, Jefferson began a project to remodel the gym. ==Demographics==