The Fullerton Joint Union High School District (FJUHSD) was organized in 1893 and serves grades 9-12. It serves a fifty-square-mile area that includes the elementary districts of Buena Park, Fullerton, La Habra and Lowell Joint. Six four-year comprehensive high schools are operated by the District -- Buena Park, Fullerton, La Habra, Sonora, Sunny Hills, and Troy. La Vista High School, a continuation high school and La Sierra High School, an alternative high school, also serve FJUHSD students.

The District serves a varied socioeconomic population of families. Active parent organizations, an involved business community and supportive higher education institutions are enjoyed by the District.