Enrollment
2,563
California · 2024-25 NCES data
High school (grades 9-12) · Diamond Bar, CA
Diamond Bar High
Federal NCES profile for Diamond Bar High, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 59/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 064128007894
👥 S:T ratio 0
📚 AP courses 100
🌟 Gifted program 70
🎓 Counselors 49
📋 Attendance 75
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Diamond Bar High earns 59/100 on the Resource Investment Index, with class sizes larger than 88% of California schools. It is also one of the largest schools in California.
- #2 of 10
- public schools in Diamond Bar · Resource Index
- 59
- Resource Index · Higher
- 26.7:1
- large classes for California
- 21.3%
- free-lunch eligible
Diamond Bar High has class sizes larger than 88% of California schools. Computed live against every California school reporting to NCES.
By Resource Investment Index, Diamond Bar High ranks #2 of 10 public schools in Diamond Bar, CA.
School address
District: Walnut Valley Unified · California
NCES ID 064128007894 Verify on NCES CCD record →
Teachers (FTE)
96.0
Federal CCD staff survey
Students per teacher
26.7:1
vs 21.5:1 California avg
+24% vs state
Free-lunch eligible
21.3%
vs 55.5% California avg
-62% vs state
Student-teacher ratio in context
How Diamond Bar High compares with California and U.S. medians
What stands out at Diamond Bar High
Diamond Bar High is a large high school in Diamond Bar, California, enrolling 2,563 students.
Class loads run heavy: 26.7:1 is larger than about 88% of California schools and 24% above the 21.5:1 state mean, so each teacher carries more students than is typical.
Comparatively few students face economic hardship here, 21.3% free-meal eligibility runs 62% below the California average.
By headcount it is one of the larger campuses in California, bigger than 99% of state schools at 2,563 students.
Its Resource Investment Index outscores 91% of the 9,998 California schools with a score on record, a top-tier result on this measure.
Among 226 similarly sized, similarly resourced-need California schools statewide, it ranks #5, a top-tier result once campus size and economic need are matched.
Its student body is led by Asian (72%) and Hispanic or Latino (17%) (diversity index 45/100).
On the academic-pipeline side it reports 26 Advanced Placement courses.
Counselor coverage runs a bit thin, about 256 students per counselor, somewhat past the ASCA-recommended 250:1 benchmark.
10.2% of students were chronically absent in the 2021-22 collection, in line with the post-pandemic national range.
The surrounding Walnut Valley Unified spends $12,979 per pupil, 21% below the California average, a leaner-resourced district than most.
Walnut Valley Unified also operates Walnut High (2,148 students) and Chaparral Middle (1,349 students) alongside Diamond Bar 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 Diamond Bar High compares
Diamond Bar 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 | 26.7:1 | ▲ 24% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 21.3% | ▼ 62% | 55.5% | 51.7% |
| Enrollment | 2,563 | top 1% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
26.7:1
Leaner classes than 3% of US schools, heavier class loads than most.
2,563
Bigger than 99% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Economic need
21.3%
free-lunch eligible
- 62% below the California average of 55.5%
Below the 40% Title I threshold, among the lower-need profiles in the state; federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
26.7:1
students per teacher
- 24% above state mean
Top 88% in California - lower ratio than 12% of state schools
Well above 20:1, one of the more stretched staffing loads nationally relative to enrollment.
Engagement
10.2%
chronically absent (missed 10%+ of school days)
In the 10-15% range, above the pre-pandemic national baseline but within the broader post-pandemic picture.
Funding equity
$12,979
per pupil, district-wide
- below California avg of $16,509
Well below the U.S. average per-pupil spend, a notably leaner funding position that may affect programs, facilities, and staffing.
Support staff
Counselors10.0 FTE
Per 256 students, the combined health-and-guidance staffing load for this school.
Discipline context
86
in-school suspensions + 51 out-of-school
Suspension rate: 3.4 per 100 students. Combined in-school and out-of-school rate: 5.3 per 100 students. Reported via the Civil Rights Data Collection.
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
Asian 71.9%
Hispanic or Latino 17.2%
White 5.0%
Two or More 4.1%
African American 1.4%
Native Hawaiian / Pacific Islander 0.4%
Largest group: Asian at 71.9% of enrollment.
Student-body diversity index 44.9/100
Simpson diversity index - at 44.9, Diamond Bar High is about as mixed as the California school average of 46.0.
Programs
AP courses offered 26
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Walnut Valley Unified, which includes Diamond Bar High.
$12,979
Per student
-21%
vs California
Avg $16,509
-22%
vs U.S.
Avg $16,593
Revenue mix
Local 36.8%
State 54.5%
Federal 8.7%
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 Diamond Bar High Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Walnut High | Similar size | Similar economic need | Lower S:T ratio |
| Chaparral Middle | Smaller | Similar economic need | Higher S:T ratio |
| Suzanne Middle | Smaller | Similar economic need | Similar S:T ratio |
| South Pointe Middle | Smaller | Similar economic need | Similar S:T ratio |
| Evergreen Elementary | Smaller | Similar economic need | Similar S:T ratio |
Comparisons are relative to Diamond Bar High's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 2,148
- Students per teacher
- 23.1:1
- Resource Index
- 52/100
- Enrollment
- 1,349
- Students per teacher
- 30.7:1
- Resource Index
- 41/100
- Enrollment
- 1,190
- Students per teacher
- 27:1
- Resource Index
- 43/100
- Enrollment
- 979
- Students per teacher
- 27.2:1
- Resource Index
- 47/100
- Enrollment
- 709
- Students per teacher
- 25.3:1
- Resource Index
- 27/100
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 (~2,563 students)
Similar student-teacher ratio (~26.7:1)
Next steps
Verify locally before acting on Diamond Bar High's federal record.
- Compare Diamond Bar High against another school. Compare schools
- Walnut Valley Unified'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 Diamond Bar High
How many students attend Diamond Bar High?
Diamond Bar High has 2,563 students enrolled. It is a high school in Diamond Bar, CA.
What is the student-teacher ratio at Diamond Bar High?
The student-teacher ratio at Diamond Bar High is 26.7:1, which is 24% higher than the California average of 21.5:1 and 70% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Diamond Bar High?
21.3% of students at Diamond Bar High are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Diamond Bar High?
The largest demographic group at Diamond Bar High is Asian at 71.9% of enrollment, in Diamond Bar, CA.
What is the Resource Investment Index for Diamond Bar High?
Diamond Bar High has a Resource Investment Index of 59/100 (higher 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 Diamond Bar High rank among public schools in Diamond Bar?
By Resource Investment Index, Diamond Bar High ranks #2 of 10 public schools in Diamond Bar, CA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Diamond Bar on the city page.
Is Diamond Bar High a good school?
Diamond Bar High earns 59/100 on the Resource Investment Index, with class sizes larger than 88% of California schools. 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 Walnut Valley Unified?
Besides Diamond Bar High, Walnut Valley Unified also operates Walnut High (2,148 students), Chaparral Middle (1,349 students), and Suzanne Middle (1,190 students). See the Walnut Valley Unified 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.