Enrollment
1,542
California · 2024-25 NCES data
High school (grades 9-12) · Pomona, CA
Diamond Ranch High
Federal NCES profile for Diamond Ranch High, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 36/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 063132007136
👥 S:T ratio 6
🌟 Gifted program 70
🎓 Counselors 38
📋 Attendance 28
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Diamond Ranch High earns 36/100 on the Resource Investment Index, with class sizes near the California median.
- #5 of 7
- high schools in Pomona · Resource Index
- 36
- Resource Index · Typical
- 23.4:1
- students per teacher
- 59.1%
- free-lunch eligible
Diamond Ranch High has class sizes near the California median. Computed live against every California school reporting to NCES.
By Resource Investment Index, Diamond Ranch High ranks #5 of 7 high schools in Pomona, CA.
School address
District: Pomona Unified · California
NCES ID 063132007136 Verify on NCES CCD record →
Teachers (FTE)
66.0
Federal CCD staff survey
Students per teacher
23.4:1
vs 21.5:1 California avg
+9% vs state
Free-lunch eligible
59.1%
vs 55.5% California avg
+6% vs state
Student-teacher ratio in context
How Diamond Ranch High compares with California and U.S. medians
What stands out at Diamond Ranch High
Large campus carrying a heavier staffing load
Diamond Ranch High is larger than most California schools and also reports more students per teacher than the state norm. Those facts reinforce one another: this is not merely a small specialist campus whose ratio is distorted by a tiny denominator. The operational constraint is scale paired with tighter staffing. Families comparing programs should inspect whether counselors, gifted access, and other support indicators compensate for that teacher-staffing load.
Need and resources require a component-level read
Diamond Ranch High falls within the wide middle of the California distribution on both free-meal eligibility and the Resource Investment Index. Neither measure supplies an honest headline by itself. The useful distinctions are in the components: classroom staffing, counselor availability, attendance, gifted-program access, and district spending. Those fields can pull in opposite directions even when the overall percentile looks ordinary.
Attendance is the dominant support signal
Diamond Ranch High's 28.9% chronic-absence rate is more consequential than a generic staffing label: at least one quarter of students missed 10% or more of school days in the 2021-22 collection. That level can affect instruction, counseling demand, and continuity even when other reported resources look ordinary. The dataset records the scale of absence but not its causes, so it should prompt a current-year question rather than a conclusion about school management.
Diamond Ranch High is a higher-need, large high school in Pomona, California, enrolling 1,542 students.
Class loads run somewhat heavier than typical: 23.4:1 puts it in the larger third of California schools by student-teacher ratio.
Its free-meal eligibility rate of 59.1% lands close to the California typical range, neither a high- nor low-need campus by this measure.
By headcount it is one of the larger campuses in California, bigger than 94% of state schools at 1,542 students.
Its Resource Investment Index lands in the upper third of 9,998 scored California schools.
Against 396 statewide peers matched on enrollment and economic need, it ranks in the upper tier at #90.
Its student body is led by Hispanic or Latino (78%) and Asian (10%) (diversity index 38/100).
On the academic-pipeline side it reports 18 Advanced Placement courses.
Counselor coverage runs a bit thin, about 308 students per counselor, somewhat past the ASCA-recommended 250:1 benchmark.
Chronic absenteeism is elevated: 28.9% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
Its district draws 17.6% of revenue from federal sources, an above-typical federal share that tends to track a higher-need student population.
Among Pomona's high schools, it stands alongside Garey High (1,567 students): Diamond Ranch High is smaller than that campus by headcount and runs heavier classes (23.4:1 vs 20.9:1).
Pomona Unified also operates Garey High (1,567 students) and School of Extended Educational Options (1,204 students) alongside Diamond Ranch 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 Ranch High compares
Diamond Ranch 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 | 23.4:1 | ▲ 9% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 59.1% | ▲ 6% | 55.5% | 51.7% |
| Enrollment | 1,542 | top 6% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
23.4:1
Leaner classes than 7% of US schools, heavier class loads than most.
1,542
Bigger than 96% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Economic need
59.1%
free-lunch eligible
- 6% 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
23.4:1
students per teacher
- 9% above state mean
Top 66% in California - lower ratio than 34% of state schools
Above 20:1, running heavier than the typical U.S. public school; staffing is comparatively stretched.
Engagement
28.9%
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
$20,239
per pupil, district-wide
- above California avg of $18,665
Somewhat above the U.S. public-school average, reflecting higher local or state investment per enrolled student.
Support staff
Counselors5.0 FTE
Per 308 students, the combined health-and-guidance staffing load for this school.
Discipline context
2
in-school suspensions + 76 out-of-school
Suspension rate: 0.1 per 100 students. Combined in-school and out-of-school rate: 5.1 per 100 students. Reported via the Civil Rights Data Collection.
Student demographics
Hispanic or Latino 78.1%
Asian 10.3%
African American 5.0%
White 3.2%
Two or More 2.9%
Native Hawaiian / Pacific Islander 0.5%
Largest group: Hispanic or Latino at 78.1% of enrollment.
Student-body diversity index 37.5/100
Simpson diversity index - at 37.5, Diamond Ranch High is less mixed than the California school average of 46.0.
Programs
AP courses offered 18
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Pomona Unified, which includes Diamond Ranch High.
$20,239
Per student
+8%
vs California
Avg $18,665
+15%
vs U.S.
Avg $17,658
Revenue mix
Local 21.6%
State 60.9%
Federal 17.6%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2022-23 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
How Diamond Ranch High Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Garey High | Similar size | Higher economic need | Lower S:T ratio |
| School of Extended Educational Options | Similar size | Similar economic need | Higher S:T ratio |
| Pomona High | Smaller | Higher economic need | Lower S:T ratio |
| Ganesha High | Smaller | Higher economic need | Lower S:T ratio |
| Vejar Elementary | Smaller | Higher economic need | Lower S:T ratio |
Comparisons are relative to Diamond Ranch High's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,567
- Students per teacher
- 20.9:1
- Resource Index
- 34/100
- Enrollment
- 1,204
- Students per teacher
- 32.5:1
- Resource Index
- 43/100
- Enrollment
- 993
- Students per teacher
- 16.6:1
- Resource Index
- 37/100
- Enrollment
- 895
- Students per teacher
- 19.5:1
- Resource Index
- 35/100
- Enrollment
- 741
- Students per teacher
- 20.6:1
- Resource Index
- 22/100
Similar high schools in Pomona
6 comparable high schools (grades 9-12) serving the same city.
Garey High
Standard public school
1,567 students 20.9:1 students per teacher
Pomona High
Standard public school
993 students 16.6:1 students per teacher
Ganesha High
Standard public school
895 students 19.5:1 students per teacher
International Polytechnic High
Alternative education program
458 students 20.8:1 students per teacher
Village Academy High School at Indian Hill
Alternative education program
270 students 15.9:1 students per teacher
Park West High (Continuation)
Alternative education program
225 students 14.1:1 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 (~1,542 students)
Similar student-teacher ratio (~23.4:1)
Next steps
Verify locally before acting on Diamond Ranch High's federal record.
- Compare Diamond Ranch High against another school. Compare schools
- Pomona 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 Ranch High
How many students attend Diamond Ranch High?
Diamond Ranch High has 1,542 students enrolled. It is a high school in Pomona, CA.
What is the student-teacher ratio at Diamond Ranch High?
The student-teacher ratio at Diamond Ranch High is 23.4:1, which is 9% higher than the California average of 21.5:1 and 49% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Diamond Ranch High?
59.1% of students at Diamond Ranch High are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Diamond Ranch High?
The largest demographic group at Diamond Ranch High is Hispanic or Latino at 78.1% of enrollment, in Pomona, CA.
What is the Resource Investment Index for Diamond Ranch High?
Diamond Ranch High has a Resource Investment Index of 36/100 (typical reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, gifted-program reporting, counselor availability, chronic absenteeism. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Diamond Ranch High rank among high schools in Pomona?
By Resource Investment Index, Diamond Ranch High ranks #5 of 7 high schools in Pomona, 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 Pomona on the city page.
What other schools are in Pomona Unified?
Besides Diamond Ranch High, Pomona Unified also operates Garey High (1,567 students), School of Extended Educational Options (1,204 students), and Pomona High (993 students). See the Pomona 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, the data changelog, or report a data error. Data current as of August 2026.