Armstrong Elementary
🇺🇸 Official data · 2025Diamond Bar, California 91765 · Pomona Unified
#1914 of 5,693 elementary schools in California
#25279 of 50,301 nationally
About Armstrong Elementary
Armstrong Elementary is a public elementary located in Diamond Bar, in the Pomona Unified school district of California, United States. It caters for Grades K–6. In 2025 it enrolled 251 students. Traditional public schools run by a school district; free to attend.
Its Success Index (US) is 49.8 out of 100, placing it in the lower 50% of elementary schools in United States and 1914th of 5,693 ranked elementary schools in California. Its strongest component is reading proficiency (80th percentile), and its weakest is students per teacher (22th percentile).
Other published figures: enrollment 251.
There are 10 schools in Diamond Bar; Armstrong Elementary ranks 8th of 10 scored schools there.
Success Index (US) breakdown
Each component is a percentile against elementary schools across United States.
- Math proficiency (30%)42%
- Reading proficiency (30%)67%
- Community advantage (fewer free/reduced-price lunch) (25%)66.9%
- Students per teacher (15%)19.3
The Success Index (US) summarises published data about a school community. It is not a measure of teaching quality. Read the methodology.
Published measures
All figures published for Armstrong Elementary by the official sources.
- Enrollment
- 251
- Students enrolled in the latest NCES directory year.
- Free/reduced-price lunch
- 66.9%
- Share of students eligible for free or reduced-price lunch.
- Students per teacher
- 19.3
- Enrollment divided by FTE teachers; not class size.
- Reading proficiency
- 67%
- Share of tested students proficient or above (all students, all grades).
- Math proficiency
- 42%
- Share of tested students proficient or above (all students, all grades).
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Schools near Armstrong Elementary
Closest schools by straight-line distance, with their Success Index (US).
Lorbeer Middle
Diamond Bar · Public middle · Grades 7–8
688 students · 1.0 km away
Golden Springs Elementary
Diamond Bar · Public elementary · Grades K–6
388 students · 1.6 km away
Pantera Elementary
Diamond Bar · Public elementary · Grades K–6
512 students · 2.7 km away
Maple Hill Elementary
Diamond Bar · Public elementary · Grades K–5
556 students · 2.8 km away
Chaparral Middle
Diamond Bar · Public middle · Grades 6–8
1,349 students · 2.9 km away
Quail Summit Elementary
Diamond Bar · Public elementary · Grades K–5
696 students · 2.9 km away
Walnut High
Walnut · Public high · Grades 9–12
2,148 students · 3.0 km away
Suzanne Middle
Walnut · Public middle · Grades 6–8
1,190 students · 3.0 km away
Ranch Hills Elementary
Pomona · Public elementary · Grades K–6
449 students · 3.4 km away
Diamond Ranch High
Pomona · Public high · Grades 9–12
1,542 students · 3.6 km away
Similar schools
Public elementary schools in California with a comparable Enrollment.
Mary Peacock Elementary
Crescent City · Public elementary · Grades K–5
251 students
Penryn Elementary
Penryn · Public elementary · Grades K–8
250 students
Loreto Street Elementary
Los Angeles · Public elementary · Grades K–5
250 students
Joshua Tree Elementary
Joshua Tree · Public elementary · Grades K–6
250 students
John Foster Dulles Elementary
La Mirada · Public elementary · Grades K–5
250 students
Oakdale Heights Elementary
Oroville · Public elementary · Grades K–5
252 students
Frequently asked questions
Is Armstrong Elementary a good school?
Armstrong Elementary has a Success Index (US) of 49.8 out of 100 (Lower 50% of elementary schools in United States) and ranks #1914 of 5,693 in California. The index summarises published data about the school community and, where available, attainment; it does not measure teaching quality, so visit the school and ask about support at your child's level.
Where does Armstrong Elementary rank in California?
Armstrong Elementary ranks #1914 of 5,693 elementary schools in California and #25279 of 50,301 nationally on the Success Index (US) (2025 data).
How many students attend Armstrong Elementary?
Armstrong Elementary had 251 students in 2025.
Is Armstrong Elementary a elementary school or a high school?
Armstrong Elementary is classified as a elementary covering Grades K–6. It is a public school.
What other schools are near Armstrong Elementary?
There are 10 schools within 15 km of Armstrong Elementary; they are listed on this page with their Success Index (US) and distance, and can be compared side by side.