Chaffey Joint Union High School District

Chaffey Joint Union High School District is a 9-12 school district located in San Bernardino County, California, United States that serves the communities of Ontario, Montclair, Rancho Cucamonga, and portions of Fontana, Upland, Chino, and Mount Baldy. With more than 25,000 students, it is one of the largest high school districts in the state. The district operates eight comprehensive high schools, one online high school, one continuation high school, one community day school, and one adult education school.