Enrollment
358
Middle
DISTRICT 718 · STATE 659
SCHOOL COMMUNITY·ANTIOCH UNIFIED·NCES 060285004440
Black Diamond Middle
4730 Sterling Hill Dr., Antioch, CA 94531 · (925) 779-7460 · Contra Costa County
GRADES 07–08MIDDLE21-SUBURBTITLE IREGULAR SCHOOL358 STUDENTS
Student : Teacher
21.3:1
17 FTE teachers
DISTRICT 22.2:1 · STATE 20.7:1
Free / Reduced Lunch
81%
290 students
DISTRICT 79% · STATE 65%
Community
0
0 members
Enrollment and student:teacher ratio compared against other middle schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade, 2024-25
| Grade | Students | Share |
|---|---|---|
| Grade 6 | 6 | 2% |
| Grade 7 | 184 | 51% |
| Grade 8 | 168 | 47% |
Student demographics
70%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 67% · STATE 62% · US 70%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
School pathway
Based on grade levels within Antioch Unified. Attendance zones can vary; confirm enrollment with the district.
Test scores
CAASPP 2024-25 . % met or exceeded standardEnglish Language Arts
21.6%
CA avg 49.1% . -0.4pp since 2014
Math
8.0%
CA avg 37.7% . -5.0pp since 2014
What this means: On the CAASPP, California's statewide test, about 22 of every 100 students at this school read and write at grade level and about 8 of 100 do math at grade level. Across all California schools, those numbers are about 49 and 38. Reading and writing scores have held steady since 2014, while math scores are down about 5 points.
Performance levels, 2024-25
| Subject | Standard Exceeded | Standard Met | Standard Nearly Met | Standard Not Met |
|---|---|---|---|---|
| English Language Arts | 4.3% | 17.2% | 22.4% | 56.0% |
| Math | 3.7% | 4.3% | 17.5% | 74.5% |
Share of tested students at each CAASPP level. Each student counts in one level, so a row adds to about 100%.
CAASPP results by year
| School year | English Language Arts | Math |
|---|---|---|
| 2024-25 | 21.6% | 8.0% |
| 2023-24 | 22.2% | 13.1% |
| 2022-23 | 20.1% | 9.2% |
| 2021-22 | 18.0% | 7.9% |
| 2018-19 | 17.5% | 6.5% |
| 2017-18 | 18.8% | 12.8% |
| 2016-17 | 20.3% | 8.8% |
| 2015-16 | 20.0% | 12.0% |
| 2014-15 | 22.0% | 13.0% |
% met or exceeded standard, all students and all tested grades.
Source: CAASPP. All students, all grades. See all years and grades →
BeatsExpectations
Demographically-adjusted score · methodologyTier
UNDERPERFORMING
Bottom 10% of CA schools after controlling for student poverty
Actual proficiency
16.2%
composite math + reading, all grades
Predicted
32.1%
based on CA schools with similar FRL share
Beats by
-15.9pp
below demographic expectation
What this means: About 16% of students here test proficient in math and reading, below the roughly 32% typical for California schools with a similar share of low-income students. BeatsExpectations compares each school with others at the same poverty level, not by raw scores, so a school lands here when its results trail those comparable schools, which is not the same as having low scores. A higher-scoring school can still fall in this tier if similar schools score higher still.
BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →
Where Black Diamond Middle ranks
Among middle schools| Measure | This school | In California | In Contra Costa County |
|---|---|---|---|
| State test proficiency ranked highest first | 16.2% | #1,124 of 1,224 | #32 of 39 |
| Math proficiency ranked highest first | 8.0% | #1,181 of 1,227 | #39 of 42 |
| Reading proficiency ranked highest first | 21.6% | #1,138 of 1,227 | #36 of 42 |
| 3-year test score change ranked biggest gain first | +1.8pp | #645 of 1,214 | #27 of 42 |
| Enrollment ranked largest first | 358 | #1,136 of 1,377 | #41 of 44 |
| Students per teacher ranked fewest first | 21.3:1 | #671 of 1,279 | #11 of 43 |
| Diversity index ranked most diverse first | 69.8% | #138 of 1,278 | #14 of 43 |
| Enrollment change since 2017-18 ranked steepest decline first | -4.3% | #827 of 930 | #30 of 35 |
Ranked against other public middle schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list.
7-year change
SY 2017-18 vs SY 2024-25Enrollment
358
-16 (-4%) vs 2017
Student : Teacher
21.3:1
was 23.7:1
% White
8%
was 8%
% Hispanic
42%
was 36%
% Black
33%
was 35%
% Asian
9%
was 13%
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free or reduced lunch |
|---|---|---|---|---|
| 2024-25 | 358 | 16.8 | 21.3:1 | 81% (290) |
| 2023-24 | 343 | 18 | 19.0:1 | 72% (247) |
| 2022-23 | 369 | 15.8 | 23.3:1 | 68% (250) |
| 2017-18 | 374 | 15.8 | 23.7:1 | 74% (278) |
Source: NCES Common Core of Data. Rows are the federal collections on file for Black Diamond Middle.
About Black Diamond Middle
Black Diamond Middle is a middle-grades school in Antioch, California, reachable at (925) 779-7460. Classes run from 7 through 8, and the school has 358 students. Against the 659-student average for middle schools in California, enrollment here is 46% lower.
Antioch Unified is the district for Black Diamond Middle. It has 25 schools and 15,111 students.
Hispanic students form the largest group at Black Diamond Middle, 42% of enrollment. The next largest groups are 33% Black, 9% Asian, 8% White, and 6% multiracial. In Contra Costa County overall, about 28% of residents are Hispanic. The chance that two students picked at random at Black Diamond Middle belong to different racial or ethnic groups, known as the diversity index, is 70%.
A ratio of 21.3:1 comes from the school's 16.8 full-time-equivalent teachers. Middle schools in California average about 20.7:1, a similar figure. The lunch program counts 81% of students at Black Diamond Middle as eligible for free or reduced-price meals. Among public schools in Contra Costa County, the average eligibility rate is 45%.
After accounting for student poverty, Black Diamond Middle is in the bottom 10% of California schools. Its average proficiency rate on state tests of 16.2% is 15.9 points below the 32.1% predicted for its lunch-eligibility share.
Recent Census Bureau figures for Contra Costa County show that median household income is about $127,229, 45% of adults hold a bachelor's degree or higher, and about 6% of people live in poverty. Federal data list 280 public schools in Contra Costa County, with a combined enrollment of about 167,423.
Thomas Gaines Virtual Academy is the public school closest to Black Diamond Middle, less than a tenth of a mile away. Inside a five-mile radius, there are at least 8 other public schools. On average proficiency, Black Diamond Middle is 7th of 7 nearby schools with test data.
The NCES locale for Black Diamond Middle is Suburb: Large, which covers schools in a suburban area outside a principal city, within an urbanized area with a population of 250,000 or more.
Black Diamond Middle saw enrollment fall 4% between 2017-18 and 2024-25. Hispanic enrollment as a share of the school grew from 36% to 42%. The ratio was 23.7:1 in 2017-18 and 21.3:1 in 2024-25.
To ask about school safety, transportation, and start times, start a discussion on this page. Posting is open to anyone connected to the school.
Contra Costa County at a glance
View full county profilePopulation
1,165,012
Census ACS
Median income
$127,229
Household, ACS
Bachelor's+
45%
Adults 25+
Poverty rate
6%
Below federal line
Schools in county
280
167,423 students
Quick facts
Related schools
Other schools in Antioch Unified
- Deer Valley HighHigh · 1,812 students
- Antioch HighHigh · 1,776 students
- Park MiddleMiddle · 1,055 students
- Dallas Ranch MiddleMiddle · 795 students
- Orchard ParkElementary · 751 students
- Dozier-Libbey Medical HighHigh · 681 students
Other schools in Antioch
- Deer Valley HighHigh · 1,812 students
- Antioch HighHigh · 1,776 students
- Park MiddleMiddle · 1,055 students
- Dallas Ranch MiddleMiddle · 795 students
- Dozier-Libbey Medical HighHigh · 681 students
- Antioch MiddleMiddle · 665 students
Nearby schools
- Thomas Gaines Virtual Academy0.0 mi · 261
- Jack London Elementary0.5 mi · 446
- Deer Valley High0.6 mi · 1,812
- Carmen Dragon Elementary0.8 mi · 495
- Diablo Vista Elementary0.8 mi · 496
- Grant Elementary1.1 mi · 478
Frequently asked questions
About Black Diamond MiddleHow many students attend Black Diamond Middle?
Black Diamond Middle enrolls approximately 358 students in grades 07-08.
What age range does Black Diamond Middle serve?
Black Diamond Middle serves students from grade 07 through grade 08.
How many students per teacher at Black Diamond Middle?
Approximately 21.3:1 students per teacher at Black Diamond Middle.
How diverse is Black Diamond Middle?
Black Diamond Middle reports a student body of 8% White, 42% Hispanic, 33% Black, 9% Asian, 6% Two or more.
What district is Black Diamond Middle in?
Black Diamond Middle is part of Antioch Unified.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.