Chaffey Joint Union High
Ontario, California · 23,145 students · 11 schools
Enrollment
23,145
Schools
11
Location
Ontario, California
Schools in this district
Etiwanda HighEtiwanda, CA
3,596 students
Chaffey HighOntario, CA
3,346 students
Rancho Cucamonga HighRancho Cucamonga, CA
3,264 students
Los Osos HighRancho Cucamonga, CA
2,837 students
Montclair HighMontclair, CA
2,769 students
Alta Loma HighAlta Loma, CA
2,456 students
Ontario HighOntario, CA
2,182 students
Colony HighOntario, CA
2,122 students
Methodology & sources
- NCES Common Core of Data (CCD) directory
- U.S. Dept. of Education EDFacts assessment results
- California accountability framework (per-indicator). California publishes per-indicator dashboard ratings instead of a single rollup grade — this projection is a COSMIQ composite over math+ELA proficiency, not an official state rating. Cross-check the state dashboard for the per-indicator view. (as of 2026-05-27)
Learn anything, free.
COSMIQ is a free, voice-driven AI tutor for every learner. No credit card, ever.
Start learning free →About this profile. COSMIQ is an independent, free AI tutoring service and is not affiliated with, endorsed by, or sponsored by Chaffey Joint Union High, California, or any government education agency. All figures are drawn from public U.S. Department of Education data (NCES Common Core of Data and EDFacts). Any projected rating is an independent estimate, not an official score. COSMIQ does not collect or publish user reviews or ratings of schools.
Data last refreshed July 7, 2026.