Summary:
ZIP code 91040 has one middle school, Mt. Gleason Middle, serving grades 6–8; it enrolls 753 students and reports a student–teacher ratio of 18.2:1 for 2024–2025. The clearest academic strength is science: in 2025–2026, 42% of students were proficient, compared with 36% statewide and 32% in Los Angeles Unified. That science advantage over the state—6 points—is the strongest result in the data.
Because Mt. Gleason is the only school listed, it is not meaningfully possible to identify a top or bottom school within the ZIP code. Compared with state results, the school was slightly ahead in all-grades ELA (50% versus 49%) and math (39% versus 38%), while its math result was 1 point below the district’s 40%. Science stands out more clearly: Mt. Gleason was 6 points above the state and 10 above the district. A separate concern is chronic absenteeism: the school’s 26% rate was 7 points above the state’s 18% and 3 points above the district’s 23%.
Results improved in math and science but slipped in ELA from 2024–2025 to 2025–2026: math rose 6 points, from 33% to 39%, and science rose 8 points, from 34% to 42%, while ELA fell 2 points, from 52% to 50%. Eighth-grade ELA is the clearest grade-level weakness: 47% were proficient, 2 points below the state; math was above the state in each grade, though grade 7 was only narrowly ahead. SchoolDigger’s ranking rose from the 63rd percentile in 2023–2024 to the 65th in 2025–2026. As context, 82% of students were free/reduced lunch eligible in 2024–2025; California also provides free school meals statewide.
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