Summary:
ZIP code 91108 has one high school, San Marino High, serving grades 9–12 and enrolling 886 students, so families have no other high school in the ZIP code to compare it with. The most important finding is that its 2025–2026 proficiency was well above California’s in all three subjects: 89% in ELA versus 49% statewide, 86% in math versus 38%, and 80% in science versus 36%. Math had the largest school–state advantage, at 47 percentage points.
There is no top or bottom school within this one-school list, but San Marino High’s subject results show different strengths: ELA was its highest proficiency result, while math had its biggest advantage over the state. The same pattern appeared in 11th grade, where the school was 32 points above California in ELA, 54 points in math, and 41 points in science. Graduation and attendance indicators were also favorable against state figures: the graduation rate was 98%, 10 points above California, and chronic absenteeism was 1%, 18 points below the state rate.
Proficiency rose from 2024–2025 to 2025–2026 by 5 points in ELA, 8 in math, and 9 in science; the school’s advantage over the state widened by 4, 7, and 5 points, respectively. SchoolDigger’s ranking for San Marino High moved from 15th of 2,159 schools to 35th of 2,162, then improved to 25th of 2,137; its latest position was 10 places below its earliest. SchoolDigger rates San Marino Unified five stars and ranks it 7th of 968 districts, in the 99th percentile. Other context includes a 20.4:1 student-teacher ratio in 2024–2025 and 11.5% free/reduced lunch eligible that year; California has statewide free meals in place. The performance trend covers only two years, and there is no second school for comparison.
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