Schools in 91764 — Ontario, California: 12 schools. Average score 3.4 points below the state. Here is what that number does — and doesn't — tell you.

91764 has 12 ranked schools in Ontario, averaging a Scope Score of 36.7/100 — 3.4 points below the state average of 40.1 (a state average weighted to 91764's own mix of school levels; CDE CAASPP 2025). Scores range from 19.6 to 59.5, a 40.0-point spread.

How 91764 schools perform

The top-ranked school is Chaffey District Online High with a Scope Score of 60 and 42.6% of students exceeding standard.

Cohort growth among 91764's elementary schools — the returning cohort, 2023 G3 → 2025 G5 — averages +80 scale-score points across 10 schools in 91764 with a large enough tested cohort. Scale scores rise with grade for nearly every school, so this describes the cohort's trajectory, not a ranking against other zip codes — worth examining school by school.

Chronic absenteeism across 91764 averages 17.6%, near the state average of 18.3%, weighted to 91764's own level mix. CDE CAASPP 2025.

How 91764 compares to nearby zip codes

Zip	City	Miles	Schools	Avg Score	vs 91764
91764	Ontario	—	12	36.7/100	—
91730	Rancho Cucamonga	2.5	11	34.1/100	-2.6
91786	Upland	2.7	9	40.4/100	+3.7
91762	Ontario	3.0	11	41.1/100	+4.4
91701	Alta Loma	3.8	10	55.1/100	+18.4
91761	Ontario	4.0	10	41.8/100	+5.1

Source: CDE CAASPP 2025, analyzed by SchoolScope.

School archetypes in 91764

5 On the Rise2 Strong All-Around2 Culture First1 Growth Engine2 Building Momentum1 not compared

Hidden gems: 6 schools in 91764 are classified as On the Rise (5) or Growth Engine — showing positive growth trajectories that raw proficiency scores alone don't capture. These are schools where students leave with more than they arrived with.

Archetypes are data-driven labels based on Scope Score dimensions. Learn more

For the data nerds

All schools in 91764

ranked by Scope Score · 2024–25 CAASPP

Figures

Score range19.6 – 59.5

40.0 pts SchoolScope composite

Chronic absenteeismstate avg 18.3% (level-matched)

17.6% CDE Attendance 2025

Elementary Schools (10)

avg 36.7/10010 ranked elementary schools4 Solid, 4 Developing, +2 more

#	School	Exceeded	Score
1	Edison Elementary Ontario-Montclair Strong All-Around	36.4%	85th percentile · StrongScope Score 58/100
2	Corona Elementary Ontario-Montclair Growth Engine	24.1%	71st percentile · SolidScope Score 46/100
3	Central Language Academy Ontario-Montclair On the Rise	13.9%	62nd percentile · SolidScope Score 41/100
4	Vineyard Elementary Ontario-Montclair On the Rise	14.8%	60th percentile · SolidScope Score 40/100
5	Lincoln Elementary Ontario-Montclair On the Rise	14.6%	56th percentile · SolidScope Score 38/100
6	Berlyn Elementary Ontario-Montclair On the Rise	8.5%	37th percentile · DevelopingScope Score 31/100
7	Del Norte Elementary Ontario-Montclair Culture First	10.4%	36th percentile · DevelopingScope Score 31/100
8	Mariposa Elementary Ontario-Montclair On the Rise	10.0%	35th percentile · DevelopingScope Score 30/100
9	Arroyo Elementary Ontario-Montclair Culture First	8.5%	29th percentile · DevelopingScope Score 28/100
10	Ontario Center Cucamonga Elementary Building Momentum	6.8%	19th percentile · Needs SupportScope Score 24/100

Middle Schools (1)

avg 30.6/1001 ranked middle schools1 Developing

#	School	Exceeded	Score
1	Ray Wiltsey Middle Ontario-Montclair Building Momentum	10.0%	37th percentile · DevelopingScope Score 31/100

High Schools (2)

avg 39.6/1002 ranked high schools1 Solid, 1 Developing

#	School	Exceeded	Score
1	Chaffey District Online High Chaffey Joint Union High Strong All-Around	42.6%	70th percentile · SolidScope Score 60/100
2	Valley View High (Continuation) Chaffey Joint Union High continuation high school	1.3%	27th percentile · DevelopingWithin its own school classScope Score 20/100

Source: CDE CAASPP 2025 · 12 schools in 91764Methodology · Explore all schools

Schools in 91764 on the map

Open these schools on the map →

Data source: California Department of Education · CAASPP 2024-25 · Methodology

Scores are SchoolScope's analysis of public data, not official CDE ratings. They represent one way of interpreting test results and should not be the sole basis for school decisions.

What Scope Scores can't tell you about 91764

Numbers tell you whether students are clearing the bar. A school visit tells you whether they're happy doing it. These metrics are intentionally missing from the Scope Score: class sizes and student-teacher interaction quality; arts, music, athletics, and enrichment programs; teacher experience and turnover; campus safety and social-emotional support; parent and community engagement; quality of special education and gifted programs; how school zones and enrollment boundaries affect access. Full methodology

Frequently asked questions

Are the schools in 91764 (Ontario) good?

91764 has 12 ranked schools in Ontario, averaging a Scope Score of 36.7/100 — 3.4 points below the state average, a benchmark weighted to 91764's own mix of school levels. 15.5% of students exceed the state standard on average. Data source: California Department of Education CAASPP 2025, analyzed by SchoolScope.

What is the best school in 91764?

The highest-scoring school in zip code 91764 is Chaffey District Online High with a Scope Score of 60/100 and 42.6% of students exceeding the state standard. See full methodology.

How do 91764 schools compare to the state average?

Schools in zip code 91764 average a Scope Score of 36.7/100 — 3.4 points below the state average of 40.1, a state average weighted to zip code 91764's own mix of school levels. The exceeded rate averages 15.5% vs. 20.9% statewide (also level-weighted).

How many schools are in zip code 91764?

Zip code 91764 has 12 ranked schools with Scope Scores. Schools are ranked using a weighted composite of CAASPP test performance, growth trajectory, chronic absenteeism, and suspension rate. Schools with insufficient testing data are not ranked.

What does the Scope Score measure?

The Scope Score is SchoolScope's composite rating (0–100), built from publicly available California school data across academic-performance and school-climate signals. Full methodology and weights.

All California Schools Chaffey Joint Union High Ontario-Montclair Cucamonga Elementary Ontario Schools Zip 91730 Zip 91786 Zip 91762 Zip 91701 Zip 91761

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