Very Good
#3331 of 9,539 schools in CA
Top 35% in state
Armstrong Elementary
Elementary School · Pomona Unified
22750 Beaverhead Dr., Diamond Bar, CA 91765
Enrollment
249
Student-Teacher
20.8:1
Score
7.1
Grades
Kindergarten – 6th
Enrollment
249
Student-Teacher
20.8:1
Score
7.1
Grades
Kindergarten – 6th
Data vintage
2022-23
Data vintage2022-23
How this school compares
California schools
#3,331 of 9,539
In Diamond Bar
#7 of 10
public schools
In district
#7 of 36
Pomona Unified
Academic performance
8.1 / 10
Excellent
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Armstrong Elementary
Elementary School in Diamond Bar · grades Kindergarten – 6th. Start here, then compare fit against nearby and district options.
Limai Montessori Academy
0.4 mi away. Use as a geographic alternative in the same move search.
Village Montessori Academy
0.4 mi away. Use as a geographic alternative in the same move search.
About Armstrong Elementary
Armstrong Elementary is a public elementary school in Diamond Bar, CA, part of Pomona Unified. Armstrong Elementary serves approximately 249 students, and covers grades Kindergarten-6th, and has a 20.8:1 student-teacher ratio. Armstrong Elementary has a current MySchoolScout rating of 7.1 out of 10 and ranks #3,331 of 9,539 schools in CA.
Structured state assessment records for Armstrong Elementary show 46% math proficiency (multi-year average, 2009-2024) and 55% reading/ELA proficiency (multi-year average, 2009-2024).
- This school 7.1 · Very Good
- District avg 6.1
- CA avg 6.2
What Parents Should Know
Armstrong Elementary runs 20.8:1 students to teachers, above the national average. That often means bigger classes. Ask how the school supports kids who need extra help, and whether there are teaching assistants or small-group time.
37% of students at Armstrong Elementary were chronically absent in the 2022-23 school year, above the national average. Chronic absenteeism means missing 15 or more school days, and at high rates it drags on classroom pacing for everyone. Ask what the school does to help families get kids to class consistently.
Score Breakdown
Full Profile · 3/3 metricsView breakdown
View breakdown
View breakdown
Armstrong Elementary — Students at Armstrong Elementary score 46% proficient, which is above what's typical for similar communities (expected: 35%).
Equity & Diversity
Shown separately, not included in overall scoreFree/Reduced Lunch
69.1%
Students qualifying for federal meal assistance
Test Scores CA CAASPP (2023-24)
Based on 32 test records from CA state assessments. About our data
Proficiency Trend
↓ DecliningAverage proficiency (% at or above grade level) across Math & ELA over time.
Source: EdFacts (NCES) and state assessment data. Growth score: 6.4/10.
How Armstrong Elementary Compares
See how Armstrong Elementary performs across key quality dimensions compared to state benchmarks.
Funding & Resources
Programs & Offerings
Data as of 2021-22 · Source: CRDC via Urban Institute · Learn more
Location
22750 Beaverhead Dr., Diamond Bar, CA 91765
Nearby Alternatives
Families considering Armstrong Elementary may also want to explore other elementary schools in the area. Pantera Elementary (rated 8.7/10, 1.7 miles away), which scores notably higher. Another option is Maple Hill Elementary (rated 8.6/10, 1.7 miles away), which scores notably higher. Additionally, Quail Summit Elementary (rated 8.5/10, 1.8 miles away), which scores notably higher. For more schools in Diamond Bar, see our Diamond Bar schools guide .
Nearby Schools
20 within 2.0 mi| School | Distance | Rating |
|---|---|---|
| LiMai Montessori Academy Diamond Bar | 0.4 mi | — |
| VILLAGE MONTESSORI ACADEMY Diamond Bar | 0.4 mi | — |
| VILLAGE MONTESSORI ACADEMY Diamond Bar | 0.4 mi | — |
| Mt Calvary Lutheran Diamond Bar | 0.5 mi | — |
| DIAMOND BAR MONTESSORI ACADEMY Diamond Bar | 0.5 mi | 5.3 |
| MT CALVARY LUTHERAN SCHOOL Diamond Bar | 0.5 mi | 6.2 |
| Lorbeer Middle Diamond Bar | 0.6 mi | 6.8 |
| Golden Springs Elementary Diamond Bar | 1.0 mi | 6.0 |
| GUIDE ACADEMY Diamond Bar | 1.5 mi | 5.9 |
| Maple Hill Elementary Diamond Bar | 1.7 mi | 8.6 |
| Chaparral Middle Diamond Bar | 1.8 mi | 8.4 |
| Quail Summit Elementary Diamond Bar | 1.8 mi | 8.5 |
| Pantera Elementary Diamond Bar | 1.7 mi | 8.7 |
| International Polytechnic High Pomona | 2.1 mi | 7.4 |
| Institute of Knowledge Diamond Bar | 1.9 mi | — |
| ST CHRISTOPHER-JOSEPH-AQUINAS ACADEMIC ACADEMY Diamond Bar | 2.0 mi | 5.2 |
| Walnut High Walnut | 1.8 mi | 8.4 |
| Suzanne Middle Walnut | 1.9 mi | 6.8 |
| DISCOVERY WORLD MONTESSORI Walnut | 2.1 mi | — |
| THE CROSS SCHOOL OF EDUCATION Walnut | 2.0 mi | — |
Neighborhood Census ACS (2019-2023)
Census data for ZIP 91765 (ACS 2019-2023 5-Year Estimates) · Data sources
Median Income
$104,737
Median Home Value
$878,900
Median Rent
$2,395/mo
Population
44,779
College Educated
53.3%
Homeownership
77.2%
Avg Commute
34 min
Poverty Rate
10.1%
Median Age
45.7
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| ALL SAINTS CATHOLIC SCHOOL Hayward, CA | 7.1 |
| BETHANY LUTHERAN SCHOOL Long Beach, CA | 7.1 |
| Bellevue-Santa Fe Charter San Luis Obispo, CA | 7.1 |
| Buttonwillow Elementary Buttonwillow, CA | 7.1 |
| Dewey Elementary San Diego, CA | 7.1 |
| Frazier Park Elementary Lebec, CA | 7.1 |
Frequently Asked Questions
Common questions about Armstrong Elementary
What grades does Armstrong Elementary serve?
Armstrong Elementary serves students in grades Kindergarten through 6th.
How many students attend Armstrong Elementary?
Armstrong Elementary has an enrollment of approximately 249 students.
What is the student-teacher ratio at Armstrong Elementary?
The student-teacher ratio at Armstrong Elementary is 20.8:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does Armstrong Elementary rank in CA?
Armstrong Elementary ranks #3,331 of 9,539 schools in CA.
What is Armstrong Elementary's MySchoolScout rating?
Armstrong Elementary has a current MySchoolScout rating of 7.1 out of 10. This score combines the level-appropriate components shown in the rating breakdown; equity data is shown separately for context.
What are the test scores at Armstrong Elementary?
Based on loaded state assessment records, Armstrong Elementary has 46% math proficiency (multi-year average, 2009-2024) and 55% reading/ELA proficiency (multi-year average, 2009-2024).
Is Armstrong Elementary a charter school?
No, Armstrong Elementary is not a charter school. It is a traditional public school operated by the local school district.
Is Armstrong Elementary a Title I school?
No, Armstrong Elementary is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for Armstrong Elementary?
69.1% of students at Armstrong Elementary qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.
Neighborhood Context
Powered by 
Quick Facts NCES CCD (SY 2022-23)
- Grades
- Kindergarten – 6th
- Enrollment
- 249
- Student-Teacher Ratio
- 20.8:1
- Teachers (FTE)
- 12
- Free/Reduced Lunch
- 69.1%
- Type
- regular
- Setting
- Large Suburb
- County
- Los Angeles County
- Chronic Absenteeism (SY 2022-23)
- 36.9%
- Phone
- (909) 397-4563
Resources & Links
District
Pomona Unified- District Enrollment
- 20,966
- Schools in District
- 37
- Per-Pupil Spending
- $20,301
- District Rank
- #7 of 36
How we rate schools
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