Ontario Center
835 North Center Avenue, Ontario, CA 91764-4841
Summary
Ontario Center is badly underperforming.
Reading and math results average to the 35th percentile among comparable California schools.
Only 31.1% of students met California's reading standard, but it is trending up.
35.1% of students met California's math standard, but it is quickly trending up.
Proficiency stats
| Current Reading Proficiency | 31.1% |
| Current Math Proficiency | 35.1% |
| Reading State Rank | 3,519/4,657 (24th percentile) |
| Math State Rank | 2,571/4,657 (45th percentile) |
School information
| Student / Teacher Ratio | 17:1 |
| Student enrollment (2024–25) | 585 |
| Low-Income Students | 441 (75.4%) |
| English Learners | 52 (8.9%) |
School Website
Great Schools
Niche
Ed-Data
CAASPP| Admissions | Open enrollment |
|---|---|
| Charter school | No |
| Magnet school | No |
Test score trends
Reading rose 5.7 points from last year and rose 8.2 points over the full period. Math rose 7.4 points from last year and rose 15.0 points over the full period.
•Math +15.0 percentage points (2024–2026)Reading Proficiency Scores
2026 state test results
Race and Ethnicity
Asian and Two or more races students have the strongest results.
Distribution of Scores by Grade
The share meeting the reading standard ranges from 25.3% to 36.0% across the grades shown. Overall, the school’s reading results rank No. 3,519 of 4,657 among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 17.2-point reading income gap is narrower than the 19.8-point gap at a typical California K–5 school. It widened over the period shown.
•English Learners vs English Native
11.1% of English learners meet the reading standard, compared with 31.5% of English-only students. The gap narrowed as English-learner results rose and English-only results rose.
•Math Proficiency Scores
2026 state test results
Race and Ethnicity
Asian students have the strongest math results at about 67% proficiency. The other reported groups range from about 30% to 45%.
Distribution of Scores by Grade
The share meeting the math standard ranges from 21.5% to 41.9% across the grades shown. Overall, the school’s math results rank No. 2,571 of 4,657 among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 14.0-point math income gap is narrower than the 20.0-point gap at a typical California K–5 school. It narrowed over the period shown.
•English Learners vs English Native
22.2% of English learners meet the math standard, compared with 36.3% of English-only students. The gap widened as English-learner results rose and English-only results rose.
•Progress as students move up
2023–2026
How we compare income gaps
“Typical” means the median gap across 1,832 schools for reading and 1,839 for math. The comparison uses 2026 California K–5 schools with at least 20 tested students in each income group and a reported low-income student population. Each school counts once. Its gap is non-low-income proficiency minus low-income proficiency, including negative gaps. California state test data
Understanding this school
How does Ontario Center compare within the district?
Ontario Center is No. 2 in reading and No. 1 in math proficiency among the 3 K–5 schools in Cucamonga Elementary with 2026 results.
Explore the district’s schoolsHow does Ontario Center rank in California?
Ontario Center ranks No. 3,519 of 4,657 in reading and No. 2,571 of 4,657 in math for 2026. These proficiency rankings compare California schools in the same grade-level category.
How do low-income students at Ontario Center compare within the district?
Low-income students here rank No. 3 in reading and No. 1 in math among 3 K–5 district schools with reportable 2026 results for this group. 27.1% meet the reading standard and 31.9% meet the math standard.
See results by student groupHow does Ontario Center compare with other schools in San Bernardino County?
Ontario Center is No. 80 in reading and No. 43 in math proficiency among the 112 K–5 schools in San Bernardino County with 2026 results.
Explore schools in San Bernardino CountyWhich schools should I compare?
Schools serving K–5 in the same district.
| School | Math | Reading |
|---|---|---|
| Ontario CenterThis school | 35.1% | 31.1% |
| Cucamonga Elementary | 27.3% | 34.8% |
| Los Amigos Elementary | 20.5% | 30.4% |
