- Enrollment
- 1,812
- Students per teacher
- 21.8:1
- Resource Index
- 23/100
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 →
CCD year-over-year · 2022-23 → 2023-24
-26 students YoY
Black Diamond Middle shrank from 369 students in 2022-23 to 343 in 2023-24 (-7.0%).
Teacher FTE added 15.8 → 18.0 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Shrinking CCD campus
-26 students YoY 060285004440 · Antioch, CA Middle · SMALL · TRAD
358 enr · 23.9:1 · 58.0% lunch · RII 26
Nearest enrollment peer: Deer Valley High (1,812 students)
Black Diamond Middle shrank from 369 students in 2022-23 to 343 in 2023-24 (-7.0%). Teacher FTE added 15.8 → 18.0 across the same CCD years. Read with this school → · District book → · California schools → · Find another →
Black Diamond Middle in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- Deer Valley Hi
Deer Valley High
1,812 students
- Antioch High
Antioch High
1,776 students
- Park Middle
Park Middle
1,055 students
- Dallas Ranch M
Dallas Ranch Middle
795 students
- Orchard Park
Orchard Park
751 students
- This school 358
Black Diamond Middle
358 students
What this shows Black Diamond Middle reports 358 students on the CCD universe file.
How Black Diamond Middle compares
Black Diamond Middle is a shrinking campus on CCD: ratios and free-lunch share vs 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 methodology
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
$17,751
per pupil, district-wide
- below California avg of $18,665
Close to the U.S. public-school average per-pupil spend.
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.
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
District finance for Antioch Unified reports $17,751 per pupil (NCES F-33) - open the district page for the full revenue mix.
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
- 1,776
- 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.
Nationwide middle schools with similar size or staffing
Out-of-state peers matched by enrollment and by student-teacher ratio, not the same-city or same-district lists above.
Similar enrollment (~358 students)
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. CCD year-over-year: 369 (2022-23) → 343 (2023-24), down 26.
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, gifted-program reporting, counselor availability, chronic absenteeism. 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.
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.