Total enrollment
22,040
-1,701 (-7%) vs SY 2020-21
11 schools in Chaffey Joint Union High
California · 22,040 students · 5 cities
In total, Chaffey Joint Union High hosts 11 public K-12 schools with about 22,040 students, averaging 2004 per school.
4-year change in Chaffey Joint Union High
SY 2020-21 vs SY 2024-25School count
11
0 (0%) vs SY 2020-21
Source: NCES Common Core of Data, enrollment-weighted demographic averages
How Chaffey Joint Union High ranks
Among districts| Measure | This district | In California | In the US |
|---|---|---|---|
| State test proficiency ranked highest first | 51.4% | #144 of 534 | N/A |
| Enrollment ranked largest first | 22,040 | #47 of 587 | #348 of 9,234 |
| Number of schools ranked most first | 11 | #206 of 587 | N/A |
| Students per teacher ranked fewest first | 24.1:1 | #546 of 587 | #8,950 of 9,044 |
| Free or reduced-price lunch share ranked highest first | 66.2% | #287 of 587 | #2,225 of 8,164 |
| Diversity index ranked most diverse first | 54.6% | #272 of 530 | #2,386 of 6,853 |
Districts need at least 2 schools and 500 students to be ranked. Test proficiency is ranked within the state only, since each state gives a different test. Each rank links to the full list.
Inside Chaffey Joint Union High
State test results across the district's 8 scored schools run from Los Osos High at 65.1% proficient to Colony High at 38.0%, a gap of 27.1 points. That is the 243rd widest gap among 458 California districts with four or more scored schools.
Since 2017-18, the 11 district schools that reported both years went from 23,871 to 22,040 students (down 8%) and from 979 to 913 full-time teachers (down 7%), as of 2024-25.
Proficient is the average share of students meeting the state standard across each school's state tests in 2023-24 and 2024-25; schools with fewer than 100 students and schools serving specialized populations are left out. Staffing figures come from the NCES Common Core of Data and count only schools that reported students and teachers in both years.
| Name | City | Level | Grades | Enrollment |
|---|---|---|---|---|
| Etiwanda High | Etiwanda | High | 09-12 | 3,446 |
| Rancho Cucamonga High | Rancho Cucamonga | High | 09-12 | 3,221 |
| Chaffey High | Ontario | High | 09-12 | 3,127 |
| Los Osos High | Rancho Cucamonga | High | 09-12 | 2,759 |
| Montclair High | Montclair | High | 09-12 | 2,515 |
| Alta Loma High | Alta Loma | High | 09-12 | 2,386 |
| Colony High | Ontario | High | 09-12 | 2,109 |
| Ontario High | Ontario | High | 09-12 | 1,994 |
| Valley View High (Continuation) | Ontario | High | 09-12 | 370 |
| Chaffey District Online High | Ontario | High | 09-12 | 93 |
| Chaffey Community Day | Ontario | High | 09-12 | 20 |
About Chaffey Joint Union High
Chaffey Joint Union High is a compact public-school district in California. The district maintains 11 schools and serves approximately 22,040 students.
Per-school enrollment averages around 2,004 in this district, above the California typical of 578.
Over the past 4-year window. Combined enrollment now sits at 22,040 students, contracted 7% from the 23,741 reported in SY 2020-21.
On this page, the community for Chaffey Joint Union High discusses open enrollment windows, redistricting talk, and busing logistics. Members of the local community share what they see day-to-day.