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Charter Oak Unified

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At a glance

624^thof 1,530 California districts▲ 170

Better than 59% of California districts

Elementary 5 Middle 1 High 3 Alternative 1Grades K-12

20240 East Cienega Ave.
Covina, CA 91724-1227·(626) 966-8331·All California district rankings →

Statewide performance 2017–2026

2026: better than 59.2% of districts

Schools

4,296

Students

Top rankedWashington Elementary795^th of 5,817 California elementary schools

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Biggest riser

Glen Oak Elementary up 589 spots statewide this year

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Smallest classes

Royal Oak Middle 21 students per teacher

SchoolDigger ratings

4★

3★

2★

1★

2 schools without a SchoolDigger rating (too few tested students)

Compare California districts →See the top-ranked California schools →

Summary:

Charter Oak Unified includes nine schools—five elementary schools, one middle school, two high schools and one alternative school—serving students from elementary through high school. Across all nine schools, average proficiency is about 47% in ELA, 36% in math and 30% in science, compared with state results of 49%, 38% and 36%. The seven schools outside the alternative and continuation settings average about 54% in ELA, 43% in math and 35% in science—above the state in ELA and math, but just below it in science. The key takeaway is that the overall averages conceal sharply different results depending on which school and setting a family considers.

Washington Elementary is the clearest academic standout, leading the group in all three subjects at about 67% in ELA, 66% in math and 57% in science; those results are 18, 28 and 21 percentage points above the state. At the other end, Arrow High (Continuation) has the lowest results, at about 5% in ELA, 11% in math and 5% in science—44, 28 and 31 points below the state. The gap between the two schools is about 62 points in ELA, 56 in math and 53 in science. Royal Oak Middle also stands out: it exceeded state results in ELA and math in both grades 7 and 8.

Group results improved over two years, but schools did not all move in the same direction: the nine-school average rose about 1 point in ELA, 3 in math and 4 in science. Glen Oak Elementary had a particularly large science gain of 19 points, while Cedargrove Elementary fell 10 points in science; Willow Elementary declined in all three subjects. SchoolDigger’s statewide percentile histories show Washington rising from the 77th to the 86th percentile, while Cedargrove fell from the 58th to the 47th. Among elementary schools, Washington also had the lowest reported free/reduced lunch eligible share for 2024–2025, at about 64%; shares ranged up to about 86% at Arrow. Its student-teacher ratio was 23.3, compared with 22.8 at Willow, so these figures do not point to a simple ratio or income pattern behind the score differences.

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Ranking:

E Elementary M Middle H High A Alternative P Private

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

School													Students/Teachers											Ranking (2026)				Ranking (2025)				CAST Science (2026)					Smarter Balanced Assessments English Language Arts/Literacy (2026)								Smarter Balanced Assessments Mathematics (2026)								Vaccination (2024-25)		Per Pupil Expenditures (2025)
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/reduced lunch (2024-25)	White	Black	Hispanic	Asian	American Indian	Pacific Islander	Two or More Races	Average Standard Score (2026)	Statewide Rank (2026)	State Percentile (2026)	SchoolDigger Rating (2026)	Average Standard Score (2025)	Statewide Rank (2025)	State Percentile (2025)	Rank Change from Previous Year	CAST Science 5th Grade	CAST Science 8th Grade	CAST Science 11th Grade	CAST Science 12th 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 7th Grade	Smarter Balanced Assessments English Language Arts/Literacy 8th Grade	Smarter Balanced Assessments English Language Arts/Literacy 11th 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 7th Grade	Smarter Balanced Assessments Mathematics 8th Grade	Smarter Balanced Assessments Mathematics 11th Grade	Smarter Balanced Assessments Mathematics All Grades	Vaccination: Kindergartners with all required immunizations	Vaccination: Exemption rate	Per Pupil Expenditures Total	Sub-total from Federal Funds	Sub-total from State/Local Funds
Arrow High (Continuation)	Public	9-12	1505 South Sunflower Ave.	Glendora	91740	Los Angeles County	Charter Oak Unified	No	(n/a)	No	(n/a)	(626) 914-3961	71	5	13.3	85.9%	6 (8.5%)	1 (1.4%)	60 (84.5%)	1 (1.4%)	1 (1.4%)	0 (0.0%)	2 (2.8%)	12.2	1836^th of 2135 public high schools	14.0%		10.9	1969^th of 2162 public high schools	8.9%	133			5.3		4.6							5.3	5.3							10.5	10.5			$41,157	$36,200	$4,957
Badillo Elementary	Public	K-6	1771 East Old Badillo Ave.	Covina	91724	Los Angeles County	Charter Oak Unified	No	(n/a)	No	(n/a)	(626) 966-1753	442	20	22.1	72.4%	26 (5.9%)	8 (1.8%)	367 (83.0%)	25 (5.7%)	2 (0.5%)	1 (0.2%)	13 (2.9%)	46	2854^th of 5817 public elementary schools	50.9%		39.9	3223^rd of 5857 public elementary schools	45.0%	369	25.0				25.0	55.1	37.0	34.6	52.5				45.2	61.2	26.1	26.9	33.9				36.9	95%	0%	$22,678	$21,466	$1,212
Cedargrove Elementary	Public	K-6	1209 North Glendora Ave.	Covina	91724	Los Angeles County	Charter Oak Unified	No	(n/a)	No	(n/a)	(626) 966-8675	569	23	24.7	77.3%	49 (8.6%)	16 (2.8%)	455 (80.0%)	30 (5.3%)	3 (0.5%)	0 (0.0%)	16 (2.8%)	42.8	3059^th of 5817 public elementary schools	47.4%		46.3	2806^th of 5857 public elementary schools	52.1%	253	24.4				24.4	48.6	29.9	46.2	44.2				42.2	45.8	32.5	29.5	37.2				36.1	98%	1%	$21,770	$20,032	$1,738
Charter Oak High	Public	9-12	1430 East Covina Blvd.	Covina	91724	Los Angeles County	Charter Oak Unified	No	(n/a)	No	(n/a)	(626) 915-5841	1,259	57	22.0	69.5%	143 (11.4%)	39 (3.1%)	946 (75.1%)	94 (7.5%)	5 (0.4%)	0 (0.0%)	29 (2.3%)	60.2	813^th of 2135 public high schools	61.9%		57.9	879^th of 2162 public high schools	59.3%	66			38.9		38.0							55.6	55.6							27.9	27.9			$21,833	$20,552	$1,281
Glen Oak Elementary	Public	K-6	1000 North Sunflower Ave.	Covina	91724	Los Angeles County	Charter Oak Unified	No	(n/a)	No	(n/a)	(626) 331-5341	428	20	21.4	75.2%	56 (13.1%)	6 (1.4%)	332 (77.6%)	20 (4.7%)	1 (0.2%)	0 (0.0%)	13 (3.0%)	54.8	2341^st of 5817 public elementary schools	59.8%		44.3	2930^th of 5857 public elementary schools	50.0%	589	32.6				32.6	66.7	37.5	56.5	43.1				50.8	66.7	45.8	34.8	19.6				41.5	98%	0%	$23,429	$22,234	$1,195
Royal Oak Middle	Public	7-8	303 South Glendora Ave.	Covina	91724	Los Angeles County	Charter Oak Unified	No	(n/a)	No	(n/a)	(626) 967-6354	610	29	21.0	74.1%	71 (11.6%)	10 (1.6%)	455 (74.6%)	48 (7.9%)	5 (0.8%)	0 (0.0%)	21 (3.4%)	67.6	753^rd of 2740 public middle schools	72.5%		60.1	905^th of 2761 public middle schools	67.2%	152		34.8			34.8					59.9	55.6		57.7					46.1	47.3		46.7			$22,785	$21,456	$1,329
Washington Elementary	Public	K-6	325 West Gladstone	Glendora	91740	Los Angeles County	Charter Oak Unified	No	(n/a)	No	(n/a)	(626) 914-2704	421	18	23.3	63.9%	66 (15.7%)	14 (3.3%)	279 (66.3%)	47 (11.2%)	1 (0.2%)	0 (0.0%)	14 (3.3%)	87.1	795^th of 5817 public elementary schools	86.3%		78.6	1208^th of 5857 public elementary schools	79.4%	413	57.4				57.4	57.8	65.4	66.7	78.7				67.2	70.5	71.2	53.7	70.8				66.2	95%	0%	$20,307	$18,828	$1,479
Willow Elementary	Public	K-6	1427 South Willow	Glendora	91740	Los Angeles County	Charter Oak Unified	No	(n/a)	No	(n/a)	(626) 914-5839	388	17	22.8	70.6%	63 (16.2%)	14 (3.6%)	250 (64.4%)	47 (12.1%)	2 (0.5%)	0 (0.0%)	12 (3.1%)	66.4	1760^th of 5817 public elementary schools	69.7%		67	1743^rd of 5857 public elementary schools	70.2%	17	35.0				35.0	75.6	47.9	52.5	58.5				58.2	77.5	41.7	40.0	41.5				49.2	92%	0%	$23,250	$21,326	$1,924
Oak Knoll Alternative	Public, Virtual, Alternative	K-12	1505 South Sunflower Ave.	Glendora	91740	Los Angeles County	Charter Oak Unified	No	(n/a)	Yes	(n/a)	(626) 852-7972	107	3	33.2	75.7%	15 (14.0%)	2 (1.9%)	80 (74.8%)	6 (5.6%)	0 (0.0%)	0 (0.0%)	3 (2.8%)								(n/a)	25.0				16.7			50.0					42.2			25.0					11.1			$21,785	$21,052	$733
Bridges Community Day	Public	7-12	1505 South Sunflower Ave.	Glendora	91740	Los Angeles County	Charter Oak Unified	No	(n/a)	No	(n/a)	(626) 914-3961	1	2	.6	—	0 (0.0%)	0 (0.0%)	1 (100.0%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	0 (0.0%)								(n/a)

Districts nearby

District	Distance	# of Schools	Statewide Rank
Bonita Unified	0.82 mi	15	201^st
Glendora Unified	1.43 mi	10	443^rd
Covina-Valley Unified	1.93 mi	18	558^th
San Gabriel Valley Regional Occupational Program	1.95 mi	1
Azusa Unified	2.2 mi	11	1191^st

See the top CA California districts

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.