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Average

#5156 of 9,533 schools in CA

Armstrong Elementary

Elementary School · Pomona Unified

22750 Beaverhead Dr., Diamond Bar, CA 91765

Enrollment

249

Student-Teacher

20.8:1

Score

6.2

Grades

Kindergarten – 6th

Updated 2022-23

How this school compares

In Diamond Bar

#8 of 10

public schools

California elementary schools

#3,142 of 5,817

In district

#18 of 36

Pomona Unified

Academic performance

8.1 / 10

Very strong

About Armstrong Elementary

Armstrong Elementary serves 249 students in kindergarten through sixth grade in Diamond Bar, California, with a student-teacher ratio of 20.8:1 and 12 full-time equivalent teachers. This regular public school has earned a solid 7.0 out of 10 MySchoolScout rating and ranks in the 72nd percentile among California elementary schools, placing it at #2687 out of 9,566 schools statewide. Academically, Armstrong Elementary shows steady performance with 51% of students achieving proficiency or above in English Language Arts/Reading, while 41% reach proficiency in mathematics.

These results reflect the school's commitment to providing quality education in core subject areas, with room for continued growth in mathematical achievement. The school serves families in the 91765 ZIP code area, where the median household income is $105,712 and 52% of residents hold bachelor's degrees or higher. The community enjoys relatively low poverty rates at 9.7%, with median home values of $839,700 reflecting the area's desirability.

Armstrong Elementary is situated in Diamond Bar's large suburban setting within Los Angeles County, providing students with a stable educational environment in this well-established residential community.

What Parents Should Know

The student-teacher ratio at Armstrong Elementary is 20.8:1, which is higher than the national average. This may mean larger class sizes, so parents should ask about classroom support, teaching assistants, and how the school differentiates instruction for students who need extra help.

Score Breakdown

Full Profile · 3/3 metrics
Student Progress4.5Below Average50%
Year-over-year improvement in student test scores.
View breakdown
Years of Data2
Annual Change-1.75 pts/yr
Data Period2019–2024
TrendDeclining
Academics8.1Excellent30%
Student proficiency on state tests, adjusted for community poverty levels.
View breakdown
Math Proficiency40.9%
Reading/ELA Proficiency50.4%
Math vs. State Avg-4.8 pts
Reading vs. State Avg+7.6 pts
Overall Proficiency46%
Expected (poverty-adj.)36%
vs. Expected+10.1 pts
Adjusted Percentile71th
College ReadinessNot Available

Data not available for this school

Resources & Environment7.8Very Good20%
Student-teacher ratio, per-pupil spending, and attendance.
View breakdown
Student-Teacher Ratio20.8:1
Per-Pupil Spending$17,597

Armstrong Elementary — Students at Armstrong Elementary score 46% proficient, which is above what's typical for similar communities (expected: 36%).

How we calculate scores →

Equity & Diversity

Shown separately, not included in overall score

Free/Reduced Lunch

69.1%

Students qualifying for federal meal assistance

Test Scores CA CAASPP (2023-24)

Math Proficiency 41.1%
School
State
38.4%
ELA Proficiency 53.3%
School
State
45.4%

Based on 12 test records from CA state assessments. About our data

Proficiency Trend

↓ Declining

Average proficiency (% at or above grade level) across Math & ELA over time.

2019
Math
42%
ELA
67%
2024
Math
40.9%
ELA
50.6%

Source: EdFacts (NCES) and state assessment data. Growth score: 4.5/10.

How Armstrong Elementary Compares

See how Armstrong Elementary performs across key quality dimensions compared to state benchmarks.

Overall Score
6.2/10
46th percentile in CA
Academic
8.1/10
8.1/10
Growth
4.5/10
Below average
Environment
7.8/10
Above average

Funding & Resources

Free/Reduced Lunch
Students eligible for subsidized meals
69%
Teaching Staff
21:1 student-teacher ratio
12 teachers

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 8.8/10, 1.7 miles away), which scores notably higher. Another option is Quail Summit Elementary (rated 7.7/10, 1.8 miles away), which scores notably higher. Additionally, Maple Hill Elementary (rated 7.2/10, 1.7 miles away), which scores slightly 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 5.8
Golden Springs Elementary Diamond Bar 1.0 mi 5.8
GUIDE ACADEMY Diamond Bar 1.5 mi 5.9
Maple Hill Elementary Diamond Bar 1.7 mi 7.2
Chaparral Middle Diamond Bar 1.8 mi 7.6
Quail Summit Elementary Diamond Bar 1.8 mi 7.7
Pantera Elementary Diamond Bar 1.7 mi 8.8
International Polytechnic High Pomona 2.1 mi 6.0
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 7.5
Suzanne Middle Walnut 1.9 mi 6.3
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

Community Profile

The community surrounding Armstrong Elementary has a median household income of $104,737. It is a well-educated community where 53% of adults hold a bachelor's degree or higher. The median home value in the area is $878,900, with a median rent of $2,395/month. The area has a poverty rate of 10.1%. The average commute for residents is 34 minutes. Source: U.S. Census ACS 2022 5-Year Estimates.

Similar Schools

Schools in the same state with comparable level, size, and ratings

School Rating
Apple Blossom Sebastopol, CA 6.2
BETHANY BAPTIST ELEMENTARY Long Beach, CA 6.2
Blanchard Elementary Santa Paula, CA 6.2
CITY CHRISTIAN SCHOOL Ventura, CA 6.2
CRANE COUNTRY DAY SCHOOL Santa Barbara, CA 6.2
Canoas Elementary San Jose, CA 6.2

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 is ranked #5156 out of 9,533 schools in CA.

What is Armstrong Elementary's MySchoolScout rating?

Armstrong Elementary has a composite rating of 6.2 out of 10 on MySchoolScout. This score combines academic performance, student growth, and school environment into a single score. Equity data is shown separately for context.

What are the test scores at Armstrong Elementary?

Based on the most recent state assessment data, Armstrong Elementary has 41.1% math proficiency and 53.3% reading/ELA proficiency.

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.

11 schools nearby View map →

Neighborhood Context

City Safety
High (1,946/100K)

FBI UCR 2024. City-level (Diamond Bar). Data >1 year old.

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
Data Year
2023–2024

District

Pomona Unified
District Enrollment
20,966
Schools in District
37
Per-Pupil Spending
$20,301
District Rank
#18 of 36

How We Rate Schools

Every school receives a composite score from 1 to 10 based on four pillars: Academic Performance (50%), Student Growth (20%), Equity (15%), and Learning Environment (15%). Scores are built from publicly available data including standardized test results, enrollment figures, and school climate indicators.

Read our full methodology

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