Enrollment
739
California · 2024-25 NCES data
Elementary school (grades K-5) · Clayton, CA
Mt. Diablo Elementary
Federal NCES profile for Mt. Diablo Elementary, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 25/100.
2024-25 NCES dataElementary school (grades K-5)NCES 062637003959
👥 S:T ratio 0
🌟 Gifted program 30
🎓 Counselors 0
📋 Attendance 71
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Mt. Diablo Elementary earns 25/100 on the Resource Investment Index, with class sizes larger than 98% of California schools.
- 25
- Resource Index · Lower
- 35.2:1
- large classes for California
- 5.1%
- free-lunch eligible
- 739
- students enrolled
Mt. Diablo Elementary has class sizes larger than 98% of California schools. Computed live against every California school reporting to NCES.
School address
District: Mt. Diablo Unified · California
NCES ID 062637003959 Verify on NCES CCD record →
Teachers (FTE)
21.0
Federal CCD staff survey
Students per teacher
35.2:1
vs 21.5:1 California avg
+64% vs state
Free-lunch eligible
5.1%
vs 55.5% California avg
-91% vs state
Student-teacher ratio in context
How Mt. Diablo Elementary compares with California and U.S. medians
What stands out at Mt. Diablo Elementary
Mt. Diablo Elementary is a lower-poverty, mid-sized elementary school in Clayton, California, enrolling 739 students.
Class loads run heavy: 35.2:1 is larger than about 98% of California schools and 64% above the 21.5:1 state mean, so each teacher carries more students than is typical.
Comparatively few students face economic hardship here, 5.1% free-meal eligibility runs 91% below the California average.
Enrollment of 739 puts it in the larger third of California schools by headcount.
Its Resource Investment Index lands in the lower third of 9,998 scored California schools.
Among 588 similarly sized, similarly resourced-need California schools statewide, it ranks #522, in the lower tier once campus size and economic need are matched.
Its student body is led by White (52%) and Two or More (18%) (diversity index 65/100).
Counselor access is stretched at roughly 1848 students per counselor, well above the ASCA-recommended 250:1 ceiling.
11.5% of students were chronically absent in the 2021-22 collection, in line with the post-pandemic national range.
Mt. Diablo Unified also operates College Park High (1,948 students) and Northgate High (1,546 students) alongside Mt. Diablo Elementary.
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 Mt. Diablo Elementary compares
Mt. Diablo Elementary on the metrics families compare, against California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 35.2:1 | ▲ 64% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 5.1% | ▼ 91% | 55.5% | 51.7% |
| Enrollment | 739 | top 21% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
35.2:1
Leaner classes than 1% of US schools, heavier class loads than most.
739
Bigger than 82% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Economic need
5.1%
free-lunch eligible
- 91% 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
35.2:1
students per teacher
- 64% above state mean
Top 98% in California - lower ratio than 2% of state schools
Well above 20:1, one of the more stretched staffing loads nationally relative to enrollment.
Engagement
11.5%
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
$13,649
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
Counselors0.4 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
0
in-school suspensions + 1 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 0.1 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
White 52.1%
Two or More 17.6%
Hispanic or Latino 17.3%
Asian 11.5%
African American 0.9%
Native Hawaiian / Pacific Islander 0.5%
Largest group: White at 52.1% of enrollment.
Student-body diversity index 65.4/100
Simpson diversity index - at 65.4, Mt. Diablo Elementary is more mixed than the California school average of 46.0.
Programs
Funding & spending
District-wide per-pupil expenditure for Mt. Diablo Unified, which includes Mt. Diablo Elementary.
$13,649
Per student
-17%
vs California
Avg $16,509
-18%
vs U.S.
Avg $16,593
Revenue mix
Local 46.6%
State 43.9%
Federal 9.4%
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 Mt. Diablo Elementary Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| College Park High | Larger | Higher economic need | Lower S:T ratio |
| Northgate High | Larger | Similar economic need | Lower S:T ratio |
| Mt. Diablo High | Larger | Higher economic need | Lower S:T ratio |
| Concord High | Larger | Higher economic need | Lower S:T ratio |
| Ygnacio Valley High | Larger | Higher economic need | Lower S:T ratio |
Comparisons are relative to Mt. Diablo Elementary's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,948
- Students per teacher
- 25:1
- Resource Index
- 21/100
- Enrollment
- 1,546
- Students per teacher
- 24.9:1
- Resource Index
- 23/100
- Enrollment
- 1,397
- Students per teacher
- 17.7:1
- Resource Index
- 22/100
- Enrollment
- 1,137
- Students per teacher
- 18.6:1
- Resource Index
- 27/100
- Enrollment
- 1,059
- Students per teacher
- 17.4:1
- Resource Index
- 26/100
Similar elementary 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 (~739 students)
Similar student-teacher ratio (~35.2:1)
Next steps
Verify locally before acting on Mt. Diablo Elementary's federal record.
- Compare Mt. Diablo Elementary against another school. Compare schools
- Mt. Diablo 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 Mt. Diablo Elementary
How many students attend Mt. Diablo Elementary?
Mt. Diablo Elementary has 739 students enrolled. It is an elementary school in Clayton, CA.
What is the student-teacher ratio at Mt. Diablo Elementary?
The student-teacher ratio at Mt. Diablo Elementary is 35.2:1, which is 64% higher than the California average of 21.5:1 and 124% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Mt. Diablo Elementary?
5.1% of students at Mt. Diablo Elementary are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Mt. Diablo Elementary?
The largest demographic group at Mt. Diablo Elementary is White at 52.1% of enrollment, in Clayton, CA. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 65.4/100.
What is the Resource Investment Index for Mt. Diablo Elementary?
Mt. Diablo Elementary has a Resource Investment Index of 25/100 (lower 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).
Is Mt. Diablo Elementary a good school?
Mt. Diablo Elementary earns 25/100 on the Resource Investment Index, with class sizes larger than 98% 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 Mt. Diablo Unified?
Besides Mt. Diablo Elementary, Mt. Diablo Unified also operates College Park High (1,948 students), Northgate High (1,546 students), and Mt. Diablo High (1,397 students). See the Mt. Diablo 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.