Summary:
Lyons Township HSD 204 has one listed school, Lyons Township High School, serving grades 9–12 with 3,706 students. The school’s results are also strong on other reported measures: its 2025–26 graduation rate was 97%, compared with 90% statewide. The clearest finding is that it was above Illinois in all nine reported subject-and-grade test comparisons, by 20 to 27 percentage points.
Because there is only one listed school, the data cannot show which school leads or trails locally. Within the school’s state comparisons, mathematics is the strongest subject: its average advantage was 26 points, compared with 22 points in ELA and 21 points in science. Math’s state advantage was consistently large, ranging from 25 to 27 points across grades. Science had the smallest average margin, though the school still exceeded the state in every comparison. The graduation rate was 8 points above the state rate.
The overall advantage over Illinois was essentially unchanged year to year: it averaged 23 points in 2024–25 and 23 points in 2025–26. Mathematics results rose in all three matched comparisons, by 3 points in grade 11 and 2 points in grades 9 and 10. Grade 9 science moved the other way, falling 7 points, while the state result fell 3 points; the school’s advantage narrowed from 23 to 20 points. SchoolDigger lists the school at 40 of 620, in the 94th percentile with 5 stars, for 2025–26. Other context figures are a 13.8 student–teacher ratio in 2024–25 and 12% free/reduced lunch eligible in 2021–22.
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