Summary:
Zip code 91764 has 11 elementary schools with varying grade spans, including K–8 schools; nine are in Ontario-Montclair, while Journey and iEmpire Academy list separate districts. Ten schools have 2025–26 test results; iEmpire’s latest are from 2024–25, so it is not included in current-year comparisons. The most important finding is that Edison Elementary is a clear outlier: it is the only school above the state in all three subjects.
Edison leads with 77% proficient in ELA, 70% in math and 59% in science. Corona Elementary is next in ELA and math, at 51% and 44%; Edison’s lead over Corona is 26 percentage points in each subject. In science, Edison is 30 points ahead of the next-highest school, Vineyard Elementary. Results at the lower end also vary by subject: Lincoln Elementary is lowest in ELA at 31%, Berlyn Elementary is lowest in math at 21%, and Del Norte Elementary is lowest in science at 18%. Across the ten schools, averages are below state rates in ELA (43% vs. 49%), math (34% vs. 38%) and science (26% vs. 36%).
Recent changes are mixed: the school-average gap to the state narrowed in ELA, from 7 to 6 percentage points, but widened in math, from 4 to 5 points, and science, from 9 to 10 points. Science results swung sharply at Journey (up 16 points) and Corona (down 16). SchoolDigger ranks Edison at the 86th percentile and Corona at the 61st for 2025–26. Other reported measures do not sort neatly with results: in 2024–25, Corona had 91% free/reduced lunch eligible and a 22.8 student-teacher ratio, while Lincoln had 90% eligible and a lower 18.5 ratio. These figures offer context, not an explanation for school outcomes.
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