Enrollment
358
California · 2024-25 NCES data
2024-25 NCES data Middle school (grades 6-8) NCES 060285004440
Black Diamond Middle — Antioch, CA
Federal NCES profile for Black Diamond Middle, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators — Resource Investment Index 25/100.
👥 Class size 2
🌟 Gifted program 70
🎓 Counselors 28
📋 Attendance 0
How this works: Each indicator above is scored 0–100 from federal NCES and CRDC data, then averaged into the Resource Investment Index. This measures resource allocation — staffing, programs, and support services — not standardized test scores or academic outcomes. Full methodology →
School address
District: Antioch Unified · California
Public location data per NCES (National Center for Education Statistics) Common Core of Data. Verify the school's current address on the NCES CCD record.
Teachers (FTE)
15.0
Federal CCD staff survey
Students per teacher
24.6:1
vs 21.6:1 California avg
+14% 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
The federal record — no proprietary index, no editorial formula.
PlainSchools publishes the actual federal measurements — enrollment, staffing, demographics, discipline, and finance — straight from the NCES Common Core of Data, CRDC, and F-33 surveys. No composite rating, no opinion-based score on top. You get the same raw numbers researchers and policymakers use, with benchmarks, spending context, and equity indicators computed from the same federal datasets. Full methodology linked below.
What this school's NCES data tells you
Black Diamond Middle reports 358 enrolled students to the National Center for Education Statistics (NCES) alongside 15.0 full-time-equivalent teachers, producing a 24.6:1 student-teacher ratio. That figure sits 14% above the California state mean of 21.6:1, signalling larger average class loads than peers in the same state. Against the national 2024-25 average of 15.9:1, it is 55% higher, a useful calibration for families comparing districts across state lines.
Title I and federal lunch eligibility offer another window into the student body: 58.0% of pupils qualify for free meals, a proxy for household income that federal programs use to direct funding. The free-lunch share is 5% above the California average and 12% above the national baseline. Counselor coverage works out to roughly 358 students per counselor, above the ASCA-recommended ceiling of 250:1. Chronic absenteeism — missing 10% or more of school days — stands at 43.0% according to the 2021-22 Civil Rights Data Collection.
On the finance side, the surrounding Antioch Unified spends $16,158 per pupil district-wide, below the California average of $18,039 and below the national average of $19,490. Revenue comes 28.6% from local sources (property taxes), 60.0% from the state, and 11.4% from federal programs per the NCES F-33 finance survey. Taken together, these measurements produce a Resource Investment Index of 25/100 (F), calculated from 4 distinct NCES and CRDC indicators measuring resource allocation rather than academic outcomes.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Black Diamond Middle compares
Cross-validating school-level NCES values against California state and U.S. national means lets readers see whether this school is an outlier or in line with peers.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 24.6:1 | ▲ 14% | 21.6:1 | 15.9:1 |
| Free-lunch eligible | 58.0% | ▲ 5% | 55.5% | 51.8% |
| Enrollment | 358 | top 33% | — | — |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
What the federal data reveals about equity at this school
Federal measurements — not ratings — surface the resource and opportunity picture. Below are the indicators that researchers, civil-rights monitors, and funding formulas use to assess equity.
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
24.6:1
students per teacher
— 14% above state mean
Top 78% in California — lower ratio than 22% of state schools
Above 20:1 — larger class loads than the typical U.S. public school; staffing is stretched relative to enrollment.
Engagement
43.0%
chronically absent (missed 10%+ of school days)
Chronic absenteeism at or above 20% — the CDC threshold for "high" — signals significant barriers to regular attendance.
Funding equity
$16,158
per pupil, district-wide
— below California avg of $18,039
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
Enrollment 358 Top 33% in California — larger than 67% of 10,006 state schools
Teachers (FTE) 15.0
Students per teacher 24.6:1 +14% vs state
Free-lunch eligible 58.0% +5% vs state
NCES ID 060285004440
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.
Programs & staff
Gifted & talented Yes
Counselors (FTE) 1.0
Students per counselor 358:1
Discipline & special education
Chronically absent 43.0%
In-school suspensions 7
Out-of-school suspensions 58
Funding & spending
District-wide per-pupil expenditure for Antioch Unified, which includes Black Diamond Middle.
$16,158
Per student
-10%
vs California
Avg $18,039
-17%
vs U.S.
Avg $19,490
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.
Other Schools in This District
- Enrollment
- 1,812
- Students per teacher
- 22.3:1
- Enrollment
- 1,776
- Students per teacher
- 23.1:1
- Enrollment
- 1,055
- Students per teacher
- 24.3:1
- Enrollment
- 795
- Students per teacher
- 22.9:1
- Enrollment
- 751
- Students per teacher
- 23.1:1
Similar middle schools in Antioch
3 comparable middle schools (grades 6-8) serving the same city.
Educator & family resources
In-depth guides on understanding NCES data, school choice, and education funding.
Understanding NCES data
How CCD, CRDC and EDFacts feed every public-school number you see.
Choose a school district
Eight signals that matter more than the overall ranking number.
How schools are funded
Title I, F-33, state aid formulas and what per-pupil spending really means.
Chronic absenteeism
Why missing 10% of school matters and how it varies by district.
Magnet vs charter vs traditional
Three school types, three funding models, three sets of trade-offs.
School discipline data
What CRDC suspension and expulsion records do and don't reveal.
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 24.6:1, which is 14% higher than the California average of 21.6:1 and 55% higher than the national average of 15.9:1.
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%. The school serves a diverse student body in Antioch, CA.
What is the Resource Investment Index for Black Diamond Middle?
Black Diamond Middle has a Resource Investment Index of 25/100 (F) based on 4 factors: student-teacher ratio, counselor availability, attendance rates. This index measures federal resource allocation — staffing levels, program availability, and support services — not standardized test scores or academic outcomes.