Armstrong Elementary
Score 45.9/100: better than 45% of California elementary schools on 2024-25 state tests. Schools are only compared with others of the same type in the same state. How we score schools
Performance (state tests, 2024-25)
% met or exceeded standard on state tests in California, all students. Colored bars are green when the school is at or above the average for similar California schools.
Results over time
How this school's published results have moved year by year.
All 12 published results by grade and test
As published by California Department of Education. "Hidden" means the state didn't publish the result to protect student privacy.
| Subject | Grade | Test | Result | Students tested |
|---|---|---|---|---|
| English language arts | Grade 3 | Smarter Balanced ELA | 37.9 | 29 |
| English language arts | Grade 4 | Smarter Balanced ELA | 40.5 | 37 |
| English language arts | Grade 5 | Smarter Balanced ELA | 68 | 25 |
| English language arts | Grade 6 | Smarter Balanced ELA | 48 | 25 |
| English language arts | All grades | Smarter Balanced ELA | 47.4 | 116 |
| Math | Grade 3 | Smarter Balanced Math | 37.9 | 29 |
| Math | Grade 4 | Smarter Balanced Math | 18.9 | 37 |
| Math | Grade 5 | Smarter Balanced Math | 36 | 25 |
| Math | Grade 6 | Smarter Balanced Math | 28 | 25 |
| Math | All grades | Smarter Balanced Math | 29.3 | 116 |
| Science | Grade 5 | CAST | 24 | 25 |
| Science | All grades | CAST | 24 | 25 |
School profile
- Grades
- K-6
- Students
- 249
- Type
- Elementary school
- Charter school
- No
- Program
- Regular
Students
District and location
Contact
Diamond Bar, CA 91765
"Typical" is the middle (median) elementary school in California. Higher or lower is not in itself better or worse. Address, phone and website are as the state reported them to the U.S. Department of Education for 2024-25, so check with the school before visiting. School details: U.S. Department of Education, Common Core of Data (enrollment 2023-24, lunch eligibility 2024-25).
Nearby elementary schools
Straight-line distance. Check the district's attendance zones: living close to a school doesn't guarantee a place.
Explore schools around Diamond Bar
Location
Official sources
Every figure on this page comes from published government data. Check the originals here; we refresh when states release new results.
U.S. Department of Education, National Center for Education Statistics, Common Core of Data (CCD): school directory, grades served, enrollment and free/reduced-price lunch, 2023-24 and 2024-25. Spotted a mistake? Tell us.
Armstrong Elementary at a glance
Armstrong Elementary is a public elementary school in Diamond Bar, California, serving grades K-6. It is part of the Pomona Unified school district. It has about 249 students (a typical California elementary school has 464). About 68% of students are eligible for free or reduced-price lunch, compared with 72% at a typical California elementary school, which is useful context when reading test results.
In 2024-25 state tests, 47% in English language arts (similar schools: 47%) and 29% in math (similar schools: 42%) reached the state standard (% met or exceeded standard). On our score, which compares it only with other California elementary schools, it scores 45.9 out of 100: better than 45% of them, ranking #2,535 of 4,688. Its English language arts result fell by 3 points from the year before. This overview is generated automatically from published state and federal data; figures are rounded, and you can check the originals via the official sources above.
Page updated 2026-10-12.