Ontario High
🇺🇸 Official data · 2025Ontario, California 91762 · Chaffey Joint Union High
#895 of 1,343 high schools in California
#13745 of 16,910 nationally
About Ontario High
Ontario High is a public high located in Ontario, in the Chaffey Joint Union High school district of California, United States. It caters for Grades 9–12. In 2025 it enrolled 1,994 students. Traditional public schools run by a school district; free to attend.
Its Success Index (US) is 28.1 out of 100, placing it in the lower 50% of high schools in United States and 895th of 1,343 ranked high schools in California. Its strongest component is reading proficiency (44th percentile), and its weakest is students per teacher (11th percentile).
Other published figures: enrollment 1,994.
There are 34 schools in Ontario; Ontario High ranks 17th of 34 scored schools there.
Success Index (US) breakdown
Each component is a percentile against high schools across United States.
- Math proficiency (30%)27%
- Reading proficiency (30%)51%
- Community advantage (fewer free/reduced-price lunch) (25%)86.7%
- Students per teacher (15%)21.9
The Success Index (US) summarises published data about a school community. It is not a measure of teaching quality. Read the methodology.
Published measures
All figures published for Ontario High by the official sources.
- Enrollment
- 1,994
- Students enrolled in the latest NCES directory year.
- Free/reduced-price lunch
- 86.7%
- Share of students eligible for free or reduced-price lunch.
- Students per teacher
- 21.9
- Enrollment divided by FTE teachers; not class size.
- Reading proficiency
- 51%
- Share of tested students proficient or above (all students, all grades).
- Math proficiency
- 27%
- Share of tested students proficient or above (all students, all grades).
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Schools near Ontario High
Closest schools by straight-line distance, with their Success Index (US).
Richard Haynes Elementary
Ontario · Public elementary · Grades K–6
641 students · 249 m away
Vista Grande Elementary
Ontario · Public elementary · Grades K–6
358 students · 901 m away
Oaks Middle
Ontario · Public middle · Grades 7–8
668 students · 1.6 km away
Euclid Elementary
Ontario · Public elementary · Grades K–6
572 students · 1.9 km away
Sultana Elementary
Ontario · Public elementary · Grades K–6
589 students · 1.9 km away
De Anza Middle
Ontario · Public middle · Grades 7–8
510 students · 1.9 km away
Alicia Cortez Elementary
Chino · Public elementary · Grades K–6
390 students · 2.1 km away
Mission Elementary
Ontario · Public elementary · Grades K–6
571 students · 2.1 km away
Walnut Avenue Elementary
Chino · Public elementary · Grades K–6
483 students · 2.2 km away
Chino High
Chino · Public high · Grades 9–12
2,077 students · 2.5 km away
Similar schools
Public high schools in California with a comparable Enrollment.
El Rancho High
Pico Rivera · Public high · Grades 9–12
1,995 students
Cerritos High
Cerritos · Public high · Grades 9–12
1,996 students
Bellflower High
Bellflower · Public high · Grades 7–12
1,997 students
Capistrano Valley High
Mission Viejo · Public high · Grades 9–12
1,991 students
Marina High
Huntington Beach · Public high · Grades 9–12
1,997 students
South East High
South Gate · Public high · Grades 9–12
1,990 students
Frequently asked questions
Is Ontario High a good school?
Ontario High has a Success Index (US) of 28.1 out of 100 (Lower 50% of high schools in United States) and ranks #895 of 1,343 in California. The index summarises published data about the school community and, where available, attainment; it does not measure teaching quality, so visit the school and ask about support at your child's level.
Where does Ontario High rank in California?
Ontario High ranks #895 of 1,343 high schools in California and #13745 of 16,910 nationally on the Success Index (US) (2025 data).
How many students attend Ontario High?
Ontario High had 1,994 students in 2025.
Is Ontario High a elementary school or a high school?
Ontario High is classified as a high covering Grades 9–12. It is a public school.
What other schools are near Ontario High?
There are 10 schools within 15 km of Ontario High; they are listed on this page with their Success Index (US) and distance, and can be compared side by side.