Enrollment
1,349
California · 2024-25 NCES data
Middle school (grades 6-8) · Diamond Bar, CA
Chaparral Middle
Federal NCES profile for Chaparral Middle, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 41/100.
2024-25 NCES dataMiddle school (grades 6-8)NCES 064128006834
👥 S:T ratio 0
🌟 Gifted program 70
🎓 Counselors 10
📋 Attendance 85
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Chaparral Middle earns 41/100 on the Resource Investment Index, with class sizes larger than 96% of California schools.
- #3 of 10
- public schools in Diamond Bar · Resource Index
- 41
- Resource Index · Typical
- 30.7:1
- large classes for California
- 21.5%
- free-lunch eligible
Chaparral Middle has class sizes larger than 96% of California schools. Computed live against every California school reporting to NCES.
By Resource Investment Index, Chaparral Middle ranks #3 of 10 public schools in Diamond Bar, CA.
School address
District: Walnut Valley Unified · California
NCES ID 064128006834 Verify on NCES CCD record →
Teachers (FTE)
44.0
Federal CCD staff survey
Students per teacher
30.7:1
vs 21.5:1 California avg
+43% vs state
Free-lunch eligible
21.5%
vs 55.5% California avg
-61% vs state
Student-teacher ratio in context
How Chaparral Middle compares with California and U.S. medians
What stands out at Chaparral Middle
Chaparral Middle is a large middle school in Diamond Bar, California, enrolling 1,349 students.
Class loads run heavy: 30.7:1 is larger than about 96% of California schools and 43% above the 21.5:1 state mean, so each teacher carries more students than is typical.
Comparatively few students face economic hardship here, 21.5% free-meal eligibility runs 61% below the California average.
By headcount it is one of the larger campuses in California, bigger than 93% of state schools at 1,349 students.
Its Resource Investment Index lands in the upper third of 9,998 scored California schools.
Against 447 statewide peers matched on enrollment and economic need, it ranks in the upper tier at #105.
Its student body is led by Asian (78%) and Hispanic or Latino (15%) (diversity index 38/100).
Counselor access is stretched at roughly 450 students per counselor, well above the ASCA-recommended 250:1 ceiling.
Attendance holds up well here: only 6.0% of students were chronically absent, below the typical post-pandemic national figure.
The surrounding Walnut Valley Unified spends $12,979 per pupil, 21% below the California average, a leaner-resourced district than most.
Among Diamond Bar's middle schools, it stands alongside Lorbeer Middle (688 students): Chaparral Middle is larger than that campus by headcount and runs heavier classes (30.7:1 vs 23.7:1).
Walnut Valley Unified also operates Diamond Bar High (2,563 students) and Walnut High (2,148 students) alongside Chaparral Middle.
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 Chaparral Middle compares
Chaparral Middle on the metrics families compare, against California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 30.7:1 | ▲ 43% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 21.5% | ▼ 61% | 55.5% | 51.7% |
| Enrollment | 1,349 | top 7% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
30.7:1
Leaner classes than 2% of US schools, heavier class loads than most.
1,349
Bigger than 95% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Economic need
21.5%
free-lunch eligible
- 61% 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
30.7:1
students per teacher
- 43% above state mean
Top 96% in California - lower ratio than 4% of state schools
Well above 20:1, one of the more stretched staffing loads nationally relative to enrollment.
Engagement
6.0%
chronically absent (missed 10%+ of school days)
In the 5-10% range, close to the pre-pandemic national baseline.
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
Counselors3.0 FTE
Per 450 students, the combined health-and-guidance staffing load for this school.
Discipline context
14
in-school suspensions + 20 out-of-school
Suspension rate: 1.0 per 100 students. Combined in-school and out-of-school rate: 2.5 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 77.5%
Hispanic or Latino 14.5%
White 3.6%
Two or More 3.3%
African American 1.2%
Largest group: Asian at 77.5% of enrollment.
Student-body diversity index 37.6/100
Simpson diversity index - at 37.6, Chaparral Middle is less mixed than the California school average of 46.0.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Walnut Valley Unified, which includes Chaparral Middle.
$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 Chaparral Middle Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Diamond Bar High | Larger | Similar economic need | Lower S:T ratio |
| Walnut High | Larger | Similar economic need | Lower S:T ratio |
| Suzanne Middle | Similar size | Similar economic need | Lower S:T ratio |
| South Pointe Middle | Smaller | Similar economic need | Lower S:T ratio |
| Evergreen Elementary | Smaller | Similar economic need | Lower S:T ratio |
Comparisons are relative to Chaparral Middle's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 2,563
- Students per teacher
- 26.7:1
- Resource Index
- 48/100
- Enrollment
- 2,148
- Students per teacher
- 23.1:1
- Resource Index
- 52/100
- 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 middle schools in Diamond Bar
1 comparable middle schools (grades 6-8) serving the same city.
Similar middle 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 (~1,349 students)
Next steps
Verify locally before acting on Chaparral Middle's federal record.
- Compare Chaparral Middle 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 Chaparral Middle
How many students attend Chaparral Middle?
Chaparral Middle has 1,349 students enrolled. It is a middle school in Diamond Bar, CA.
What is the student-teacher ratio at Chaparral Middle?
The student-teacher ratio at Chaparral Middle is 30.7:1, which is 43% higher than the California average of 21.5:1 and 96% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Chaparral Middle?
21.5% of students at Chaparral Middle are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Chaparral Middle?
The largest demographic group at Chaparral Middle is Asian at 77.5% of enrollment, in Diamond Bar, CA.
What is the Resource Investment Index for Chaparral Middle?
Chaparral Middle has a Resource Investment Index of 41/100 (typical reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Chaparral Middle rank among public schools in Diamond Bar?
By Resource Investment Index, Chaparral Middle ranks #3 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 Chaparral Middle a good school?
Chaparral Middle earns 41/100 on the Resource Investment Index, with class sizes larger than 96% of California schools. 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 Chaparral Middle, Walnut Valley Unified also operates Diamond Bar High (2,563 students), Walnut High (2,148 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.