Enrollment
1,994
California · 2024-25 NCES data
High school (grades 9-12) · Ontario, CA
Ontario High
Federal NCES profile for Ontario High, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 33/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 060816000795
👥 S:T ratio 17
📚 AP courses 60
🌟 Gifted program 70
🎓 Counselors 20
📋 Attendance 0
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Ontario High earns 33/100 on the Resource Investment Index, with class sizes near the California median. It is also one of the largest schools in California.
- #5 of 6
- high schools in Ontario · Resource Index
- 33
- Resource Index · Typical
- 20.8:1
- students per teacher
- 74.8%
- free-lunch eligible
Ontario High has class sizes near the California median. Computed live against every California school reporting to NCES.
By Resource Investment Index, Ontario High ranks #5 of 6 high schools in Ontario, CA.
School address
District: Chaffey Joint Union High · California
NCES ID 060816000795 Verify on NCES CCD record →
Teachers (FTE)
96.0
Federal CCD staff survey
Students per teacher
20.8:1
vs 21.5:1 California avg
-3% vs state
Free-lunch eligible
74.8%
vs 55.5% California avg
+35% vs state
Student-teacher ratio in context
How Ontario High compares with California and U.S. medians
What stands out at Ontario High
Ontario High is a higher-need, large high school in Ontario, California, enrolling 1,994 students.
At 20.8:1, its student-teacher ratio sits close to the California median, within a few percentage points of the 21.5:1 state norm, neither notably crowded nor notably small.
Economic need runs somewhat above the state's typical profile, with 74.8% of students eligible for free meals.
By headcount it is one of the larger campuses in California, bigger than 97% of state schools at 1,994 students.
Its Resource Investment Index sits near the middle of the pack among 9,998 scored California schools.
Against 261 statewide peers matched on enrollment and economic need, it ranks mid-pack at #180.
Its student body is predominantly Hispanic or Latino (89% of enrollment), among the less diverse in the state (diversity index 21/100).
On the academic-pipeline side it reports 12 Advanced Placement courses.
Counselor availability sits well past the ASCA benchmark, roughly 399 students sharing each counselor, though short of the most stretched campuses.
Chronic absenteeism is elevated: 49.0% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
The federal civil-rights collection also records 4 expulsions at this campus for 2021-22.
Among Ontario's high schools, it stands alongside Chaffey High (3,127 students): Ontario High is smaller than that campus by headcount and runs leaner classes (20.8:1 vs 22.8:1).
Chaffey Joint Union High also operates Etiwanda High (3,446 students) and Rancho Cucamonga High (3,221 students) alongside Ontario High.
Sourced from NCES CCD, CRDC, and F-33 (federal records, not a quality verdict). How we source and compute this.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Ontario High compares
Ontario High on the metrics families compare, against California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 20.8:1 | ▼ 3% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 74.8% | ▲ 35% | 55.5% | 51.7% |
| Enrollment | 1,994 | top 3% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
20.8:1
Leaner classes than 13% of US schools, heavier class loads than most.
1,994
Bigger than 98% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Economic need
74.8%
free-lunch eligible
- 35% above the California average of 55.5%
Above the 40% Title I schoolwide threshold; federal funds support the whole school, not individual students.
Staffing depth
20.8:1
students per teacher
- 3% below state mean
Top 42% in California - lower ratio than 58% of state schools
Above 20:1, running heavier than the typical U.S. public school; staffing is comparatively stretched.
Engagement
49.0%
chronically absent (missed 10%+ of school days)
At or above 20%, the commonly used threshold for "high" chronic absenteeism, signaling significant barriers to regular attendance.
Funding equity
$15,404
per pupil, district-wide
- below California avg of $16,509
Somewhat below the U.S. average per-pupil spend; funding constraints may affect programs, facilities, and staffing.
Support staff
Counselors5.0 FTE
Per 399 students, the combined health-and-guidance staffing load for this school.
Discipline context
1
in-school suspensions + 182 out-of-school
Suspension rate: 0.1 per 100 students. Combined in-school and out-of-school rate: 9.2 per 100 students. Reported via the Civil Rights Data Collection. Includes 4 expulsions.
Overview
- Common Core of Data (June 2026): enrollment, staffing, and the student-teacher ratio above.
- Civil Rights Data Collection: discipline counts and program access (AP, gifted, special education).
- F-33 School District Finance Survey: the district-wide per-pupil spending figures below.
Three separate federal collections, each on its own reporting cadence - which is why this school's numbers line up on a consistent basis against every other school and state on this site, rather than mixing figures pulled from different survey years.
Student demographics
Hispanic or Latino 89.0%
Asian 3.3%
African American 2.7%
White 2.4%
Two or More 1.5%
American Indian / Alaska Native 0.8%
Native Hawaiian / Pacific Islander 0.4%
Largest group: Hispanic or Latino at 89.0% of enrollment.
Student-body diversity index 20.5/100
Simpson diversity index - at 20.5, Ontario High is less mixed than the California school average of 46.0.
Programs
AP courses offered 12
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Chaffey Joint Union High, which includes Ontario High.
$15,404
Per student
-7%
vs California
Avg $16,509
-7%
vs U.S.
Avg $16,593
Revenue mix
Local 35.9%
State 52.9%
Federal 11.2%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
How Ontario High Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Etiwanda High | Larger | Lower economic need | Higher S:T ratio |
| Rancho Cucamonga High | Larger | Lower economic need | Higher S:T ratio |
| Chaffey High | Larger | Similar economic need | Higher S:T ratio |
| Los Osos High | Larger | Lower economic need | Higher S:T ratio |
| Montclair High | Larger | Similar economic need | Higher S:T ratio |
Comparisons are relative to Ontario High's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 3,446
- Students per teacher
- 24.6:1
- Resource Index
- 28/100
- Enrollment
- 3,221
- Students per teacher
- 24.4:1
- Resource Index
- 31/100
- Enrollment
- 3,127
- Students per teacher
- 22.8:1
- Resource Index
- 30/100
- Enrollment
- 2,759
- Students per teacher
- 24.2:1
- Resource Index
- 28/100
- Enrollment
- 2,515
- Students per teacher
- 22.5:1
- Resource Index
- 36/100
Similar high schools in Ontario
5 comparable high schools (grades 9-12) serving the same city.
Chaffey High
Standard public school
3,127 students 22.8:1 students per teacher
Colony High
Standard public school
2,109 students 24.2:1 students per teacher
Valley View High (Continuation)
Alternative education program
370 students 14.8:1 students per teacher
Chaffey District Online High
Alternative education program
93 students 18.6:1 students per teacher
Chaffey Community Day
Alternative education program
20 students 10:1 students per teacher
Similar high schools statewide
Matched by enrollment size and by staffing ratio across all of California, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~1,994 students)
Similar student-teacher ratio (~20.8:1)
Next steps
Verify locally before acting on Ontario High's federal record.
- Compare Ontario High against another school. Compare schools
- Chaffey Joint Union High's spending and staffing shape this school. District profile
- Confirm current enrollment and boundaries with the school. Choosing guide
Federal record (CCD 2024-25, CRDC 2021-22) - PlainSchools assigns no subjective rating; the composite quality score is a transparent, reproducible index computed from this cited federal data.
Frequently asked questions about Ontario High
How many students attend Ontario High?
Ontario High has 1,994 students enrolled. It is a high school in Ontario, CA.
What is the student-teacher ratio at Ontario High?
The student-teacher ratio at Ontario High is 20.8:1, which is 3% lower than the California average of 21.5:1 and 32% higher than the national average of 15.7:1. Lower ratios generally mean more individual attention per student.
What percentage of students receive free lunch at Ontario High?
74.8% of students at Ontario High are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Ontario High?
The largest demographic group at Ontario High is Hispanic or Latino at 89.0% of enrollment, in Ontario, CA.
What is the Resource Investment Index for Ontario High?
Ontario High has a Resource Investment Index of 33/100 (typical reported resources relative to schools nationally) based on 5 factors: student-teacher ratio, AP course offerings, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Ontario High rank among high schools in Ontario?
By Resource Investment Index, Ontario High ranks #5 of 6 high schools in Ontario, CA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all high schools in Ontario on the city page.
Is Ontario High a good school?
Ontario High earns 33/100 on the Resource Investment Index, with class sizes near the California median. It is also one of the largest schools in California. This is a resource snapshot, not an academic rating; see the Resource Investment Index question above for what the number does and doesn't measure.
What other schools are in Chaffey Joint Union High?
Besides Ontario High, Chaffey Joint Union High also operates Etiwanda High (3,446 students), Rancho Cucamonga High (3,221 students), and Chaffey High (3,127 students). See the Chaffey Joint Union High district page for the complete list.
Related tools
Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.