At a glance
Reported students
251
NCES CCD 2024–25
Teachers (FTE)
13.5
NCES CCD 2024–25
Student–teacher ratio
18.6:1
Calculated; not a class-size measure
Grades served
KG–06
NCES preliminary directory 2025–26
School benchmarks
California elementary enrollment
14th percentile
Compared with 5,927 same-level schools reporting enrollment.
District median enrollment
511
Armstrong Elementary: 251 reported students.
State peer staffing position
13th percentile
18.6:1 reported; state peer median 22.4:1. Ratio is not class size.
Historical enrollment and staffing · CRDC 2021–22
These older figures are kept separate from 2024–25 statistics and benchmarks. Differences between years can reflect changes in enrollment, staffing, or reporting scope.
- Students
- 251
- Teachers (FTE)
- 18
- Student–teacher ratio
- 13.9:1
What the reported data says about Armstrong Elementary
Armstrong Elementary is a public elementary school serving grades KG–06 in Diamond Bar. It is one of 37 current school records connected to Pomona Unified. NCES reports 251 students for 2024–25.
Among 5,927 elementary schools in California with comparable records, this school is smaller than the reported median of 455 students. Its enrollment is at approximately the 14th percentile for that peer group. Size describes the campus, not instructional quality.
The reported student–teacher ratio is 18.6:1, below the California median of 22.4:1 for the same school level. This ratio uses total enrollment and teacher FTE; it is not an average classroom headcount and can be affected by special programs or part-time staffing.
The largest reported race and ethnicity groups are Hispanic or Latino (59.8%) and Asian (14.7%). English learners represent 14.3% of enrollment. Students served under IDEA represent 14.7%. These figures help families understand who the school serves; they are not rating inputs.
The 2021–22 civil-rights collection reports gifted and talented programming. Program availability changes, so families should confirm the current catalog and participation rules directly with the school.
Questions worth asking Armstrong Elementary
- 1How do the reported 18.6:1 student–teacher ratio and 13.5 teacher FTE translate into actual class sizes by grade?
- 2Which advanced, gifted, career, arts, and computer-science courses are available this year, and how do students qualify?
- 3What counseling support is available today? The school reported 1 counselor FTE in 2021–22.
- 4Does community eligibility provide breakfast and lunch to every enrolled student, and are summer meals available?
Enrollment needs
- English learners
- 14.3%
- Students with disabilities
- 14.7%
- Free/reduced-price lunch
- 66.9%
- Lunch program
- Yes under Community Eligibility Option (CEO)
Reported support staff
- Counselors (FTE)
- 1
- Nurses (FTE)
- 0.5
- Psychologists (FTE)
- 0
- Social workers (FTE)
- 0.04
CRDC 2021–22 full-time-equivalent counts; verify current assignments with the school.
Student demographics
Race and ethnicity share of reported enrollment
- White10%
- Hispanic59.8%
- Black6.4%
- Asian14.7%
- American Indian / Alaska Native0%
- Native Hawaiian / Pacific Islander0%
- Multiracial9.2%
Race/ethnicity: NCES CCD 2024–25. English learner and disability context: CRDC 2021–22. Lunch eligibility: NCES CCD 2024–25. Privacy rules can produce missing values.
Programs reported by the school
Gifted and talented
Offered
CRDC 2021–22: the AP flag records student enrollment; gifted and computer-science fields describe reported programs/classes. Confirm current courses and eligibility with the school.
Other schools in Pomona Unified
Start with campuses at the same school level or with similar reported enrollment.
La Verne Science and Technology Charter
Elementary · Grades KG–06
270 reported students
Barfield Elementary
Elementary · Grades KG–06
282 reported students
Kellogg Polytechnic Elementary
Elementary · Grades KG–06
302 reported students
Westmont Elementary
Elementary · Grades KG–06
327 reported students
Harrison Elementary
Elementary · Grades KG–08
328 reported students
Lincoln Elementary
Elementary · Grades KG–06
345 reported students