Enrollment
1,397
California · 2024-25 NCES data
High school (grades 9-12) · Concord, CA
Mt. Diablo High
Federal NCES profile for Mt. Diablo High, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 29/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 062637003960
👥 S:T ratio 29
📚 AP courses 55
🌟 Gifted program 30
🎓 Counselors 30
📋 Attendance 0
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Mt. Diablo High earns 29/100 on the Resource Investment Index, even as it posts class sizes smaller than 81% of California schools.
- #5 of 5
- high schools in Concord · Resource Index
- 29
- Resource Index · Lower
- 17.7:1
- small classes for California
- 55.9%
- free-lunch eligible
Mt. Diablo High has class sizes smaller than 81% of California schools. Computed live against every California school reporting to NCES.
By Resource Investment Index, Mt. Diablo High ranks #5 of 5 high schools in Concord, CA.
School address
District: Mt. Diablo Unified · California
NCES ID 062637003960 Verify on NCES CCD record →
Teachers (FTE)
79.0
Federal CCD staff survey
Students per teacher
17.7:1
vs 21.5:1 California avg
-18% vs state
Free-lunch eligible
55.9%
vs 55.5% California avg
+1% vs state
Student-teacher ratio in context
How Mt. Diablo High compares with California and U.S. medians
What stands out at Mt. Diablo High
Mt. Diablo High is a higher-need, large high school in Concord, California, enrolling 1,397 students.
Class sizes run a bit leaner than typical: 17.7:1 puts it in the smaller third of California schools by student-teacher ratio.
Its free-meal eligibility rate of 55.9% 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 93% of state schools at 1,397 students.
Its Resource Investment Index lands in the lower third of 9,998 scored California schools.
Among 461 similarly sized, similarly resourced-need California schools statewide, it ranks #352, in the lower tier once campus size and economic need are matched.
Its student body is led by Hispanic or Latino (74%) and African American (8%) (diversity index 44/100).
On the academic-pipeline side it reports 11 Advanced Placement courses.
Counselor availability sits well past the ASCA benchmark, roughly 349 students sharing each counselor, though short of the most stretched campuses.
Chronic absenteeism is elevated: 45.3% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
Among Concord's high schools, it stands alongside Clayton Valley Charter High (2,373 students): Mt. Diablo High is smaller than that campus by headcount and runs leaner classes (17.7:1 vs 25.2:1).
Mt. Diablo Unified also operates College Park High (1,948 students) and Northgate High (1,546 students) alongside Mt. Diablo 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 Mt. Diablo High compares
Mt. Diablo 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 | 17.7:1 | ▼ 18% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 55.9% | ▲ 1% | 55.5% | 51.7% |
| Enrollment | 1,397 | top 7% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
17.7:1
Leaner classes than 26% of US schools, heavier class loads than most.
1,397
Bigger than 96% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Economic need
55.9%
free-lunch eligible
- 1% 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
17.7:1
students per teacher
- 18% below state mean
Top 19% in California - lower ratio than 81% of state schools
Between 16:1 and 20:1, squarely in the typical U.S. public-school staffing range.
Engagement
45.3%
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
$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
Counselors4.0 FTE
Per 349 students, the combined health-and-guidance staffing load for this school.
Discipline context
1
in-school suspensions + 135 out-of-school
Suspension rate: 0.1 per 100 students. Combined in-school and out-of-school rate: 9.7 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
Hispanic or Latino 73.7%
African American 8.3%
Asian 7.6%
White 4.8%
Two or More 4.4%
Native Hawaiian / Pacific Islander 1.1%
Largest group: Hispanic or Latino at 73.7% of enrollment.
Student-body diversity index 44.0/100
Simpson diversity index - at 44.0, Mt. Diablo High is less mixed than the California school average of 46.0.
Programs
AP courses offered 11
Funding & spending
District-wide per-pupil expenditure for Mt. Diablo Unified, which includes Mt. Diablo High.
$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 High Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| College Park High | Larger | Lower economic need | Higher S:T ratio |
| Northgate High | Similar size | Lower economic need | Higher S:T ratio |
| Concord High | Similar size | Lower economic need | Similar S:T ratio |
| Ygnacio Valley High | Similar size | Higher economic need | Similar S:T ratio |
| Foothill Middle | Smaller | Lower economic need | Higher S:T ratio |
Comparisons are relative to Mt. Diablo High'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
- 1,137
- Students per teacher
- 18.6:1
- Resource Index
- 27/100
- Enrollment
- 1,059
- Students per teacher
- 17.4:1
- Resource Index
- 26/100
- Enrollment
- 1,005
- Students per teacher
- 29.6:1
- Resource Index
- 28/100
Similar high schools in Concord
4 comparable high schools (grades 9-12) serving the same city.
Clayton Valley Charter High
Standard public school
2,373 students 25.2:1 students per teacher
Concord High
Standard public school
1,137 students 18.6:1 students per teacher
Ygnacio Valley High
Standard public school
1,059 students 17.4:1 students per teacher
Olympic Continuation High
Alternative education program
233 students 12.9:1 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 (~1,397 students)
Next steps
Verify locally before acting on Mt. Diablo High's federal record.
- Compare Mt. Diablo High 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 High
How many students attend Mt. Diablo High?
Mt. Diablo High has 1,397 students enrolled. It is a high school in Concord, CA.
What is the student-teacher ratio at Mt. Diablo High?
The student-teacher ratio at Mt. Diablo High is 17.7:1, which is 18% lower than the California average of 21.5:1 and 13% 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 Mt. Diablo High?
55.9% of students at Mt. Diablo High are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Mt. Diablo High?
The largest demographic group at Mt. Diablo High is Hispanic or Latino at 73.7% of enrollment, in Concord, CA.
What is the Resource Investment Index for Mt. Diablo High?
Mt. Diablo High has a Resource Investment Index of 29/100 (lower 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 Mt. Diablo High rank among high schools in Concord?
By Resource Investment Index, Mt. Diablo High ranks #5 of 5 high schools in Concord, 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 Concord on the city page.
Is Mt. Diablo High a good school?
Mt. Diablo High earns 29/100 on the Resource Investment Index, even as it posts class sizes smaller than 81% 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 High, Mt. Diablo Unified also operates College Park High (1,948 students), Northgate High (1,546 students), and Concord High (1,137 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.