Summary:
Zip code 91016 has two Monrovia Unified high schools serving grades 9–12: Monrovia High (1,455 students) and Canyon Oaks High (49 students). Their 2025–26 results show a wide divide in reported academic performance and attendance; the clearest finding is that Monrovia leads Canyon Oaks by 61 percentage points in ELA and 31 points in math proficiency.
Monrovia High stands out at the top of the reportable test results, with 74% proficient in ELA, 31% in math and 38% in science. Its ELA result is 25 points above the state rate, while math is 8 points below. Canyon Oaks High is lower in reported ELA and math: 14% and 0%, respectively—36 points and 38 points below the state. Its chronic absenteeism is 57%, compared with 20% at Monrovia, and its graduation rate is 90%, versus 98% at Monrovia. Canyon Oaks’ science result is suppressed, so it cannot be compared on that subject.
Recent trends differ by school: from 2024–25 to 2025–26, Monrovia’s ELA rose 5 points and its science rose 18 points, while its math was nearly unchanged; Canyon Oaks’ ELA fell 15 points and its math fell 7. The unweighted two-school averages also declined—5 points in ELA and 4 in math—while state results were broadly steady in ELA and rose 1 point in math. SchoolDigger ranks Monrovia 515th of 2,137 California schools, in the 76th percentile with 4 stars, and Canyon Oaks 1,997th, in the 7th percentile with 0 stars. As context, in 2024–25 Monrovia had a 24.8 student–teacher ratio and 64% free/reduced lunch eligible; Canyon Oaks had a 10.8 ratio and 82% free/reduced lunch eligible. These differences describe the schools but do not explain their results.
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