Summary:
ZIP code 62269 has one high school, O Fallon High School, serving grades 9–12 and enrolling 2,540 students. There is no local top-or-bottom comparison because the ZIP-code list includes no other high schools. The clearest finding is that the school’s reported results are consistently above state levels: in 2025–2026, it outperformed the state in all nine reported subject-and-grade comparisons.
O Fallon stands out for broad strength rather than a single standout subject: its 2025–2026 average advantage over the state was 12 percentage points in ELA, 11 in mathematics and 12 in science. Across all nine comparisons, its advantage ranged from 7.3 to 15.1 points; the largest gaps were in grade 11 ACT ELA and mathematics, at about 15 points each. Other outcomes were also favorable compared with the state: graduation was 96% versus 90%, dropout was about 1 point lower, and chronic absenteeism was about 1 point lower. However, chronic absenteeism was still 22% at the school.
Results improved overall from 2024–2025 to 2025–2026: the school’s average score change across the nine measures was about a 1-point increase, and its average advantage over the state widened from 11 to 12 points. Changes varied by grade: all three grade 11 measures rose, while grade 9 ELA fell by about 5 points and grade 9 science by about 4; those grade 9 results nevertheless remained above state levels. SchoolDigger rates the school four stars and ranks it 101st of 620 schools statewide, in the 84th percentile. For context, its 2024–2025 student-teacher ratio was 16.3, and 28% of students were free/reduced lunch eligible in 2024–2025; these figures describe the school but do not explain its results.
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