Armstrong Elementary vs Chaparral Middle
A head-to-head comparison of two schools in California, United States, 2.9 km apart, using official American 2025 data. The better value in each row is highlighted.
Armstrong Elementary
Diamond Bar · Public elementary · Grades K–6
251 students
Chaparral Middle
Diamond Bar · Public middle · Grades 6–8
1,349 students
| Measure | Armstrong Elementary Diamond Bar, California | Chaparral Middle Diamond Bar, California |
|---|---|---|
| Success Index (US) | 50 Lower 50% | 78 Top 25% |
| State rank | #1914 of 5,693 | #105 of 1,334 |
| National rank | #25279 of 50,301 | #1906 of 15,369 |
| Sector | Public | Public |
| Type | Elementary | Middle |
| Year range | Grades K–6 | Grades 6–8 |
| Students | 251 | 1,349 |
| Enrollment | 251 | 1,349 |
| Free/reduced-price lunch | 66.9% | 24.6% |
| Students per teacher | 19.3 | 28.7 |
| Reading proficiency | 67% | 77% |
| Math proficiency | 42% | 77% |
| city | Diamond Bar | Diamond Bar |
| state | California | California |
| Website | – | – |
The verdict
- •Chaparral Middle scores higher on the Success Index (US) (77.5 vs 49.8).
- •Chaparral Middle does better on math proficiency (77% vs 42%).
- •Chaparral Middle does better on reading proficiency (77% vs 67%).
- •Chaparral Middle does better on community advantage (fewer free/reduced-price lunch) (24.6% vs 66.9%).
- •Armstrong Elementary does better on students per teacher (19.3 vs 28.7).
- •Chaparral Middle is the larger school with 1,349 students compared with 251.
The Success Index (US) summarises published results and context from official data. It does not measure teaching quality or fit. Methodology.
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Frequently asked questions
Is Armstrong Elementary better than Chaparral Middle?
On the Success Index (US), Chaparral Middle ranks higher (77.5 vs 49.8 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 Armstrong Elementary and Chaparral Middle?
About 2.9 km in a straight line, between Diamond Bar and Diamond Bar in California.
Which has the better Enrollment?
Armstrong Elementary: 251. Chaparral Middle: 1,349. Students enrolled in the latest NCES directory year.
How do Armstrong Elementary and Chaparral Middle rank in California?
Armstrong Elementary is 1914th of 5,693 and Chaparral Middle is 105th of 1,334 among elementary schools in California on the 2025 Success Index (US).