Black Diamond Middle vs Del Mar Middle
A head-to-head comparison of two middle schools in California, United States, 63 km apart, using official American 2025 data. The better value in each row is highlighted.
Black Diamond Middle
Antioch · Public middle · Grades 7–8
358 students
Del Mar Middle
Tiburon · Public middle · Grades 6–8
359 students
| Measure | Black Diamond Middle Antioch, California | Del Mar Middle Tiburon, California |
|---|---|---|
| Success Index (US) | 9 Lower 50% | 95 Top 5% |
| State rank | #1290 of 1,334 | #2 of 1,334 |
| National rank | #15187 of 15,369 | #59 of 15,369 |
| Sector | Public | Public |
| Type | Middle | Middle |
| Year range | Grades 7–8 | Grades 6–8 |
| Students | 358 | 359 |
| Enrollment | 358 | 359 |
| Free/reduced-price lunch | 81% | 4.7% |
| Students per teacher | 22.4 | 12.0 |
| Reading proficiency | 18% | 86% |
| Math proficiency | 8% | 81% |
| city | Antioch | Tiburon |
| state | California | California |
| Website | – | – |
The verdict
- •Del Mar Middle scores higher on the Success Index (US) (94.7 vs 8.7).
- •Del Mar Middle does better on math proficiency (81% vs 8%).
- •Del Mar Middle does better on reading proficiency (86% vs 18%).
- •Del Mar Middle does better on community advantage (fewer free/reduced-price lunch) (4.7% vs 81%).
- •Del Mar Middle does better on students per teacher (12.0 vs 22.4).
- •Del Mar Middle is the larger school with 359 students compared with 358.
The Success Index (US) summarises published results and context from official data. It does not measure teaching quality or fit. Methodology.
Free academic assessment
Torn between two schools? Start with your child.
Whichever you choose, a free Success Tutoring assessment shows exactly where your child is in English and Maths and how to get ahead before the next school year.
- Personalised learning plan mapped to the Australian Curriculum
- English & Maths from Kindergarten to Year 12
- Flexible memberships, no lock-in contracts
- Centres across NSW, VIC, QLD, WA, SA and ACT
Frequently asked questions
Is Black Diamond Middle better than Del Mar Middle?
On the Success Index (US), Del Mar Middle ranks higher (94.7 vs 8.7 out of 100). The index is built from published results and context data, not from teaching quality or fit, so visit both schools before deciding.
How far apart are Black Diamond Middle and Del Mar Middle?
About 63 km in a straight line, between Antioch and Tiburon in California.
Which has the better Enrollment?
Black Diamond Middle: 358. Del Mar Middle: 359. Students enrolled in the latest NCES directory year.
How do Black Diamond Middle and Del Mar Middle rank in California?
Black Diamond Middle is 1290th of 1,334 and Del Mar Middle is 2nd of 1,334 among middle schools in California on the 2025 Success Index (US).