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Armstrong Elementary

Q: Is Armstrong Elementary a good school?

Armstrong Elementary ranks 3044 th of 5857 California elementary schools. SchoolDigger rates this school 2 stars out of 5.

Public Grades K-6

3044^th

SchoolDigger Rank ?

of 5,857 California Elementary Schools

Better than 48% of California elementary schools

Summary

Armstrong Elementary is a K-6 public school serving 251 students in Diamond Bar, California, operating within the Pomona Unified School District, and it stands out as one of the stronger performers in its district despite facing recent academic challenges.

Academically, Armstrong's test scores in English, math, and science are notably higher than the Pomona Unified district averages, placing it second among its immediate district peers like Kellogg Polytechnic Elementary and Golden Springs Elementary, though significantly behind the top-performing Pantera Elementary. However, the school has experienced a sharp decline in its statewide ranking, with particular drops in performance for key student groups compared to previous years. Attendance remains a concern, with a chronic absenteeism rate higher than the state average, though it has improved from pandemic-era peaks.

The most striking finding is the dramatic difference between Armstrong and nearby schools in the higher-performing Walnut Valley Unified district. For example, Maple Hill Elementary, less than two miles away, has proficiency rates 30-50 points higher and a chronic absenteeism rate nearly six times lower. This contrast highlights a significant educational disparity based on district boundaries, even though Armstrong receives more funding per student than these higher-achieving neighboring schools.

251

Students ?

18.5

Student/teacher ratio ?

$26,066

Per pupil spending ?

66.9%

Free/discounted lunch ?

22750 Beaverhead Dr.
Diamond Bar, CA 91765-1566

(909) 397-4563

District: Pomona Unified

Students who attend Armstrong Elementary usually attend:

Middle:	Lorbeer Middle
High:	Diamond Ranch High

Racial breakdown:

Hispanic:

59.8%

Asian:

14.7%

White:

10.0%

See top rated California elementary schools

Compare Armstrong Elementary to nearby elementary schools!

At a glance

▬ Ranking trend: Holding steady — 51st percentile in 2013 → 48th in 2025

Strengths

✓Among the top-ranked schools in Pomona Unified

Worth a look

!Some student groups rank well below the school's overall statewide standing

Students meeting standards (2024-2025) ?

This school37%

District avg28%

California avg41%

3,044^th of 5,857

California public elementary schools ?

Bottom 48%▼ down 20 pts since 2015

From top 32% (2015) to bottom 48% (2025)

See the entire ranking list of California Elementary Schools →

★★★★★

SchoolDigger rating ?

5^th of 24Elementary Schools in the Pomona Unified

1092^nd of 1,543Pomona Unified among California districts

Statewide rank percentile over time (100 = the top-ranked school in the state; click a legend item to add a student group)

Show full rank history (all student groups)

All Students

Year	Avg score	Statewide rank	California percentile	Rating
2025	42.4	3044 of 5857	48.0%	★★☆☆☆
2024	55.5	2259 of 5869	61.5%	★★★☆☆
2023	59.8	2060 of 5859	64.8%	★★★☆☆
2022	58.1	2117 of 5883	64.0%	★★★☆☆
2019	65.8	1800 of 5789	68.9%	★★★☆☆
2018	58.8	2097 of 5662	63.0%	★★★☆☆
2017	49.8	2552 of 5692	55.2%	★★★☆☆
2016	52.9	2349 of 5614	58.2%	★★★☆☆
2015	62.8	1807 of 5611	67.8%	★★★☆☆
2013	49.4	2721 of 5530	50.8%	★★★☆☆
2012	58.4	2131 of 5390	60.5%	★★★☆☆
2011	57.2	2186 of 5377	59.3%	★★★☆☆
2010	65.0	1720 of 5314	67.6%	★★★☆☆
2009	61.4	1851 of 5193	64.4%	★★★☆☆
2008	73.6	1254 of 5113	75.5%	★★★★☆
2007	70.2	1370 of 5113	73.2%	★★★★☆
2006	63.1	1626 of 4818	66.3%	★★★☆☆
2005	70.9	1292 of 4822	73.2%	★★★★☆
2004	73.4	1177 of 4809	75.5%	★★★★☆

Disabled

Year	Avg score	Statewide rank	California percentile	Rating
2019	36.1	1469 of 2585	43.2%	★★☆☆☆

Female

Year	Avg score	Statewide rank	California percentile	Rating
2025	46.0	2694 of 5597	51.9%	★★★☆☆
2024	44.7	2746 of 5612	51.1%	★★★☆☆
2023	56.0	2128 of 5609	62.1%	★★★☆☆
2022	53.6	2237 of 5635	60.3%	★★★☆☆
2019	56.9	2123 of 5492	61.3%	★★★☆☆
2018	59.9	1983 of 5413	63.4%	★★★☆☆

Hispanic

Year	Avg score	Statewide rank	California percentile	Rating
2025	36.8	3263 of 5107	36.1%	★★☆☆☆
2024	58.4	1764 of 5107	65.5%	★★★☆☆
2023	73.8	1005 of 5087	80.2%	★★★★☆
2022	68.8	1210 of 5084	76.2%	★★★★☆
2019	66.1	1349 of 4963	72.8%	★★★★☆
2018	55.3	1874 of 4830	61.2%	★★★☆☆

Low Socio Economic Status

Year	Avg score	Statewide rank	California percentile	Rating
2025	45.7	2744 of 5460	49.7%	★★☆☆☆
2024	61.2	1719 of 5517	68.8%	★★★☆☆
2023	64.5	1497 of 5363	72.1%	★★★★☆
2022	58.3	1778 of 5264	66.2%	★★★☆☆
2019	68.2	1271 of 5173	75.4%	★★★★☆
2018	53.9	2111 of 5084	58.5%	★★★☆☆

Male

Year	Avg score	Statewide rank	California percentile	Rating
2025	37.9	3276 of 5628	41.8%	★★☆☆☆
2024	60.0	1980 of 5643	64.9%	★★★☆☆
2023	61.6	1874 of 5638	66.8%	★★★☆☆
2022	61.3	1898 of 5663	66.5%	★★★☆☆
2019	74.0	1348 of 5510	75.5%	★★★★☆
2018	52.7	2299 of 5431	57.7%	★★★☆☆

How student groups rank statewide ? (each group's percentile vs the same group at other schools — higher is better; the +/- beside each compares the group with this school's overall percentile)

Female (2025)52nd percentile+4 vs school

Low Socio Economic Status (2025)50th percentile~ school

Disabled (2019)43rd percentile-26 vs school

Male (2025)42nd percentile-6 vs school

Hispanic (2025)36th percentile-12 vs school

By subject vs California (2024-2025) ?

English Language Arts/Literacy47%~ state avg

Mathematics29%-8 vs state

Science24%-9 vs state

★

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Schools Near Armstrong Elementary

Choose columns to see: Summary School Students/Teachers Ranking Test Scores Finance All

School													Students/Teachers											Ranking (2025)				Ranking (2024)				CAST Science (2025)		Smarter Balanced Assessments English Language Arts/Literacy (2025)					Smarter Balanced Assessments Mathematics (2025)					Per Pupil Expenditures (2024)
Name	Type	Grades	Address	City	Zip	County	District	Is Charter	Is Magnet	Is Virtual	Is Title I	Phone	Enrollment	Full-time Teachers	Student/ Teacher Ratio	Free/Discounted Lunch Recipients	White	Black	Hispanic	Asian	American Indian	Pacific Islander	Two or More Races	Average Standard Score (2025)	Statewide Rank (2025)	State Percentile (2025)	SchoolDigger Rating (2025)	Average Standard Score (2024)	Statewide Rank (2024)	State Percentile (2024)	Rank Change from Previous Year	CAST Science 5th Grade	CAST Science All Grades	Smarter Balanced Assessments English Language Arts/Literacy 3rd Grade	Smarter Balanced Assessments English Language Arts/Literacy 4th Grade	Smarter Balanced Assessments English Language Arts/Literacy 5th Grade	Smarter Balanced Assessments English Language Arts/Literacy 6th Grade	Smarter Balanced Assessments English Language Arts/Literacy All Grades	Smarter Balanced Assessments Mathematics 3rd Grade	Smarter Balanced Assessments Mathematics 4th Grade	Smarter Balanced Assessments Mathematics 5th Grade	Smarter Balanced Assessments Mathematics 6th Grade	Smarter Balanced Assessments Mathematics All Grades	Per Pupil Expenditures Total	Sub-total from Federal Funds	Sub-total from State/Local Funds
Armstrong Elementary	Public	K-6	22750 Beaverhead Dr.	Diamond Bar	91765	Los Angeles County	Pomona Unified	No	(n/a)	No	(n/a)	(909) 397-4563	251	14	18.5	66.9%	25 (10.0%)	16 (6.4%)	150 (59.8%)	37 (14.7%)	0 (0.0%)	0 (0.0%)	23 (9.2%)	42.4	3044^th of 5857 public elementary schools	48.0%		55.5	2259^th of 5869 public elementary schools	61.5%	785	24.0	24.0	37.9	40.5	68.0	48.0	47.4	37.9	18.9	36.0	28.0	29.3	$26,066	$2,485	$23,581
Golden Springs Elementary	Public	K-6	245 South Ballena Dr.	Diamond Bar	91765	Los Angeles County	Pomona Unified	No	(n/a)	No	(n/a)	(909) 397-4596	388	16	25.0	72.2%	24 (6.2%)	14 (3.6%)	267 (68.8%)	61 (15.7%)	0 (0.0%)	0 (0.0%)	22 (5.7%)	60.7	2029^th of 5857 public elementary schools	65.4%		57.9	2153^rd of 5869 public elementary schools	63.3%	124	33.3	33.3	60.0	71.4	50.8	56.3	59.8	43.4	45.7	31.8	33.3	38.5	$22,067	$2,376	$19,691
Pantera Elementary	Public	K-6	801 Pantera Dr.	Diamond Bar	91765	Los Angeles County	Pomona Unified	No	(n/a)	No	(n/a)	(909) 397-4475	512	22	23.6	47.9%	23 (4.5%)	7 (1.4%)	98 (19.1%)	349 (68.2%)	0 (0.0%)	0 (0.0%)	35 (6.8%)	94.8	353^rd of 5857 public elementary schools	94.0%		97	168^th of 5869 public elementary schools	97.1%	185	63.5	63.5	71.2	84.7	82.4	88.5	81.4	82.4	80.8	58.1	77.1	74.5	$20,500	$2,198	$18,302
Maple Hill Elementary	Public	K-5	1350 Maple Hill Rd.	Diamond Bar	91765	Los Angeles County	Walnut Valley Unified	No	(n/a)	No	(n/a)	(909) 861-6224	556	21	27.1	27.3%	15 (2.7%)	0 (0.0%)	70 (12.6%)	445 (80.0%)	0 (0.0%)	2 (0.4%)	24 (4.3%)	97.1	142^nd of 5857 public elementary schools	97.6%		97.1	155^th of 5869 public elementary schools	97.4%	13	76.2	76.2	73.9	85.9	87.3		82.5	80.7	83.2	84.8		82.9	$14,023	$521	$13,502
Quail Summit Elementary	Public	K-5	23330 East Quail Summit Dr.	Diamond Bar	91765	Los Angeles County	Walnut Valley Unified	No	(n/a)	No	(n/a)	(909) 861-3004	696	28	25.3	25.0%	22 (3.2%)	11 (1.6%)	112 (16.1%)	517 (74.3%)	0 (0.0%)	0 (0.0%)	34 (4.9%)	95.5	284^th of 5857 public elementary schools	95.2%		97.2	142^nd of 5869 public elementary schools	97.6%	142	69.2	69.2	72.3	75.6	82.6		76.7	76.5	86.2	82.9		81.9	$14,157	$566	$13,591
Ranch Hills Elementary	Public	K-6	2 Trabuco Pl.	Pomona	91766	Los Angeles County	Pomona Unified	No	(n/a)	No	(n/a)	(909) 397-4978	449	22	20.4	63.5%	22 (4.9%)	35 (7.8%)	283 (63.0%)	77 (17.1%)	1 (0.2%)	1 (0.2%)	30 (6.7%)	61.8	1976^th of 5857 public elementary schools	66.3%		57.3	2180^th of 5869 public elementary schools	62.9%	204	28.0	28.0	59.6	48.4	54.0	74.6	58.9	50.0	41.3	42.0	35.7	42.1	$20,590	$2,378	$18,212
Walnut Elementary	Public	K-5	841 South Glenwick	Walnut	91789	Los Angeles County	Walnut Valley Unified	No	(n/a)	No	(n/a)	(909) 594-1820	706	27	25.8	25.2%	8 (1.1%)	2 (0.3%)	104 (14.7%)	550 (77.9%)	0 (0.0%)	2 (0.3%)	40 (5.7%)	94.2	382^nd of 5857 public elementary schools	93.5%		95.5	307^th of 5869 public elementary schools	94.8%	75	64.0	64.0	70.6	72.2	82.9		75.4	79.0	76.1	76.0		77.0	$14,771	$740	$14,031
Vejar Elementary	Public	K-5	20222 Vejar Rd.	Walnut	91789	Los Angeles County	Walnut Valley Unified	No	(n/a)	No	(n/a)	(909) 594-1434	631	27	23.0	32.2%	23 (3.6%)	5 (0.8%)	197 (31.2%)	383 (60.7%)	0 (0.0%)	0 (0.0%)	23 (3.6%)	87	827^th of 5857 public elementary schools	85.9%		89.2	738^th of 5869 public elementary schools	87.4%	89	55.5	55.5	71.3	61.8	67.8		67.0	78.7	64.8	57.1		66.6	$14,257	$862	$13,395
Kellogg Polytechnic Elementary	Public	K-6	610 Medina Ave.	Pomona	91768	Los Angeles County	Pomona Unified	No	(n/a)	No	(n/a)	(909) 397-4604	302	16	18.8	88.7%	7 (2.3%)	8 (2.6%)	270 (89.4%)	9 (3.0%)	2 (0.7%)	0 (0.0%)	6 (2.0%)	17.9	5020^th of 5857 public elementary schools	14.3%		30.3	3901^st of 5869 public elementary schools	33.5%	1119	5.9	5.9	20.0	44.2	23.5	24.4	28.6	16.1	28.9	5.9	4.9	15.3	$20,412	$2,173	$18,239
Leonard G. Westhoff Elementary	Public	K-5	1323 Country Hollow	Walnut	91789	Los Angeles County	Walnut Valley Unified	No	(n/a)	No	(n/a)	(909) 594-6483	654	25	26.4	20.3%	23 (3.5%)	4 (0.6%)	93 (14.2%)	515 (78.7%)	0 (0.0%)	3 (0.5%)	16 (2.4%)	94.7	356^th of 5857 public elementary schools	93.9%		95	348^th of 5869 public elementary schools	94.1%	8	60.2	60.2	83.5	78.4	73.6		78.2	89.4	84.5	68.8		80.0	$13,872	$556	$13,316

Frequently Asked Questions about Armstrong Elementary

What is the racial makeup of Armstrong Elementary?

Students at Armstrong Elementary are 60% Hispanic, 15% Asian, 10% White, 9% Two or more races, 6% African American.

What district is Armstrong Elementary in?

Pomona Unified

What schools do graduates of Armstrong Elementary attend?

Students who attend Armstrong Elementary usually go on to attend:

Middle : Lorbeer Middle
High : Diamond Ranch High

Is Armstrong Elementary a good school?

Armstrong Elementary ranks 3044^th of 5857 California elementary schools. SchoolDigger rates this school 2 stars out of 5.

How many students attend Armstrong Elementary?

In the 2024-25 school year, 251 students attended Armstrong Elementary.

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SchoolDigger data sources: National Center for Education Statistics, U.S. Department of Education, the U.S. Census Bureau and the California Department of Education.

IMPORTANT DISCLAIMERS: Not all boundaries are included. We make every effort to ensure that boundaries are up-to-date. But it's important to note that these are approximations and are for general informational purposes only. To verify legal descriptions of boundaries or school locations, contact your local tax assessor's office and/or school district.