Enrollment
358
California · 2024-25 NCES data
Middle school (grades 6-8) · Antioch, CA
Black Diamond Middle
Federal NCES profile for Black Diamond Middle, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 26/100.
2024-25 NCES dataMiddle school (grades 6-8)NCES 060285004440
👥 S:T ratio 4
🌟 Gifted program 70
🎓 Counselors 28
📋 Attendance 0
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Black Diamond Middle earns 26/100 on the Resource Investment Index, with class sizes larger than 70% of California schools. It is also more racially and ethnically mixed than most California schools.
- #3 of 4
- middle schools in Antioch · Resource Index
- 26
- Resource Index · Lower
- 23.9:1
- large classes for California
- 58.0%
- free-lunch eligible
Black Diamond Middle has class sizes larger than 70% of California schools. Computed live against every California school reporting to NCES.
By Resource Investment Index, Black Diamond Middle ranks #3 of 4 middle schools in Antioch, CA.
School address
District: Antioch Unified · California
NCES ID 060285004440 Verify on NCES CCD record →
Teachers (FTE)
15.0
Federal CCD staff survey
Students per teacher
23.9:1
vs 21.5:1 California avg
+11% vs state
Free-lunch eligible
58.0%
vs 55.5% California avg
+5% vs state
Student-teacher ratio in context
How Black Diamond Middle compares with California and U.S. medians
What stands out at Black Diamond Middle
Black Diamond Middle is a higher-need, mid-sized middle school in Antioch, California, enrolling 358 students.
Class loads run somewhat heavier than typical: 23.9:1 puts it in the larger third of California schools by student-teacher ratio.
Its free-meal eligibility rate of 58.0% lands close to the California typical range, neither a high- nor low-need campus by this measure.
Enrollment of 358 puts it in the smaller third of California schools by headcount.
Its Resource Investment Index lands in the lower third of 9,998 scored California schools.
Against 1,354 statewide peers matched on enrollment and economic need, it ranks mid-pack at #724.
Its student body is led by Hispanic or Latino (42%) and African American (33%), more mixed than most schools in the state (diversity index 70/100).
Counselor availability sits well past the ASCA benchmark, roughly 358 students sharing each counselor, though short of the most stretched campuses.
Chronic absenteeism is elevated: 43.0% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
Among Antioch's middle schools, it stands alongside Park Middle (1,055 students): Black Diamond Middle is smaller than that campus by headcount and runs leaner classes (23.9:1 vs 25.7:1).
Antioch Unified also operates Deer Valley High (1,812 students) and Antioch High (1,776 students) alongside Black Diamond 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 Black Diamond Middle compares
Black Diamond 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 | 23.9:1 | ▲ 11% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 58.0% | ▲ 5% | 55.5% | 51.7% |
| Enrollment | 358 | top 67% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
23.9:1
Leaner classes than 7% of US schools, heavier class loads than most.
358
Bigger than 41% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
58.0%
free-lunch eligible
- 5% 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
23.9:1
students per teacher
- 11% above state mean
Top 70% in California - lower ratio than 30% of state schools
Above 20:1, running heavier than the typical U.S. public school; staffing is comparatively stretched.
Engagement
43.0%
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
$15,485
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
Counselors1.0 FTE
Per 358 students, the combined health-and-guidance staffing load for this school.
Discipline context
7
in-school suspensions + 58 out-of-school
Suspension rate: 2.0 per 100 students. Combined in-school and out-of-school rate: 18.2 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 41.9%
African American 32.7%
Asian 8.9%
White 8.4%
Two or More 6.4%
Native Hawaiian / Pacific Islander 1.1%
American Indian / Alaska Native 0.6%
Largest group: Hispanic or Latino at 41.9% of enrollment.
Student-body diversity index 69.8/100
Simpson diversity index - at 69.8, Black Diamond Middle is more mixed than the California school average of 46.0.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Antioch Unified, which includes Black Diamond Middle.
$15,485
Per student
-6%
vs California
Avg $16,509
-7%
vs U.S.
Avg $16,593
Revenue mix
Local 28.6%
State 60.0%
Federal 11.4%
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 Black Diamond Middle Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Deer Valley High | Larger | Similar economic need | Lower S:T ratio |
| Antioch High | Larger | Similar economic need | Lower S:T ratio |
| Park Middle | Larger | Higher economic need | Higher S:T ratio |
| Dallas Ranch Middle | Larger | Similar economic need | Higher S:T ratio |
| Orchard Park | Larger | Similar economic need | Similar S:T ratio |
Comparisons are relative to Black Diamond Middle's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,812
- Students per teacher
- 21.8:1
- Resource Index
- 23/100
- Enrollment
- 1,776
- Students per teacher
- 20.9:1
- Resource Index
- 22/100
- Enrollment
- 1,055
- Students per teacher
- 25.7:1
- Resource Index
- 27/100
- Enrollment
- 795
- Students per teacher
- 25.6:1
- Resource Index
- 27/100
- Enrollment
- 751
- Students per teacher
- 24.2:1
- Resource Index
- 18/100
Similar middle schools in Antioch
3 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 (~358 students)
Similar student-teacher ratio (~23.9:1)
Next steps
Verify locally before acting on Black Diamond Middle's federal record.
- Compare Black Diamond Middle against another school. Compare schools
- Antioch 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 Black Diamond Middle
How many students attend Black Diamond Middle?
Black Diamond Middle has 358 students enrolled. It is a middle school in Antioch, CA.
What is the student-teacher ratio at Black Diamond Middle?
The student-teacher ratio at Black Diamond Middle is 23.9:1, which is 11% higher than the California average of 21.5:1 and 52% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Black Diamond Middle?
58.0% of students at Black Diamond Middle are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Black Diamond Middle?
The largest demographic group at Black Diamond Middle is Hispanic or Latino at 41.9% of enrollment, in Antioch, CA. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 69.8/100.
What is the Resource Investment Index for Black Diamond Middle?
Black Diamond Middle has a Resource Investment Index of 26/100 (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).
How does Black Diamond Middle rank among middle schools in Antioch?
By Resource Investment Index, Black Diamond Middle ranks #3 of 4 middle schools in Antioch, CA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all middle schools in Antioch on the city page.
Is Black Diamond Middle a good school?
Black Diamond Middle earns 26/100 on the Resource Investment Index, with class sizes larger than 70% of California schools. It is also more racially and ethnically mixed than most 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 Antioch Unified?
Besides Black Diamond Middle, Antioch Unified also operates Deer Valley High (1,812 students), Antioch High (1,776 students), and Park Middle (1,055 students). See the Antioch 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.