Schools in Chaffey Joint Union High, California (2025)
8 schools · 21,557 students · 8 public · median Enrollment 2,759.
Chaffey Joint Union High, in California, has 8 schools in United States's 2025 data, together educating about 21,557 students. By level there is 8 high; by sector 8 public.
The median Enrollment across Chaffey Joint Union High's schools is 2,759, above the California median of 503. Students enrolled in the latest NCES directory year.
8 of the 8 schools qualify for the Success Index (US). The highest-scoring is Los Osos High (63.9, top 50% of high schools nationally), followed by Rancho Cucamonga High (57.0, top 50% of high schools nationally), and Etiwanda High (52.2, top 50% of high schools nationally). Scores are percentiles within school type, so compare an elementary school with other elementary schools.
The largest schools are Etiwanda High (3,446 students), Rancho Cucamonga High (3,221 students), Chaffey High (3,127 students).
Schools are spread across 5 citys, with the most in Ontario (3), Rancho Cucamonga (2), Etiwanda (1), Alta Loma (1).
Ranked schools in Chaffey Joint Union High
Ordered by Success Index (US). Rank positions shown on each profile are within United States and California.
- 164Los Osos HighRancho Cucamonga · Public High58% Math proficiency · 2,759 students
- 257Rancho Cucamonga HighRancho Cucamonga · Public High52% Math proficiency · 3,221 students
- 352Etiwanda HighEtiwanda · Public High44% Math proficiency · 3,446 students
- 448Alta Loma HighAlta Loma · Public High40% Math proficiency · 2,386 students
- 539Colony HighOntario · Public High35% Math proficiency · 2,109 students
- 638Montclair HighMontclair · Public High35% Math proficiency · 2,515 students
- 728Ontario HighOntario · Public High27% Math proficiency · 1,994 students
- 825Chaffey HighOntario · Public High20% Math proficiency · 3,127 students
| # | School | Sector | Success Index (US) | Key result | Students |
|---|---|---|---|---|---|
| 1 | Los Osos High Rancho Cucamonga · High · Grades 9–12 | Public | 63.9 Top 50% | 58% Math proficiency | 2,759 |
| 2 | Rancho Cucamonga High Rancho Cucamonga · High · Grades 9–12 | Public | 57.0 Top 50% | 52% Math proficiency | 3,221 |
| 3 | Etiwanda High Etiwanda · High · Grades 9–12 | Public | 52.2 Top 50% | 44% Math proficiency | 3,446 |
| 4 | Alta Loma High Alta Loma · High · Grades 9–12 | Public | 48.2 Lower 50% | 40% Math proficiency | 2,386 |
| 5 | Colony High Ontario · High · Grades 9–12 | Public | 38.7 Lower 50% | 35% Math proficiency | 2,109 |
| 6 | Montclair High Montclair · High · Grades 9–12 | Public | 38.4 Lower 50% | 35% Math proficiency | 2,515 |
| 7 | Ontario High Ontario · High · Grades 9–12 | Public | 28.1 Lower 50% | 27% Math proficiency | 1,994 |
| 8 | Chaffey High Ontario · High · Grades 9–12 | Public | 24.8 Lower 50% | 20% Math proficiency | 3,127 |
Compare the top 4 schools in Chaffey Joint Union High side by side →
Citys in Chaffey Joint Union High
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Frequently asked questions
What is the best school in Chaffey Joint Union High?
Los Osos High is the highest-ranked school in Chaffey Joint Union High with a Success Index (US) of 63.9 out of 100 (Top 50% of high schools in United States).
How many schools are in Chaffey Joint Union High?
Chaffey Joint Union High has 8 schools (8 high) educating 21,557 students in 2025.
What is the typical Enrollment in Chaffey Joint Union High?
The median Enrollment across schools in Chaffey Joint Union High is 2,759. Students enrolled in the latest NCES directory year.