Summary:
The high-school list for Lyons Township HSD 204 contains one school: Lyons Township High School, serving grades 9–12 with 3,706 students. Its most important result is consistent: in 2025–2026, all nine reported test results were above Illinois results, by 19.5 to 26.6 percentage points.
There is no meaningful local top-to-bottom comparison because this is the only school listed. Relative to the state, however, the school stands out across every reported grade and subject. Mathematics shows its largest average advantage: 26 points over Illinois, compared with 22 points in English language arts and 21 points in science. English language arts has the highest average school proficiency, at 77%, while mathematics averages 66% and science 69%. SchoolDigger ranks the school 33rd of 738, in the 96th percentile, and gives it five stars. Its 2025–2026 completion measures are also favorable: graduation was 97% versus 90% statewide, while dropout was 0% versus 2%.
The school’s overall test advantage remained nearly unchanged across the two years shown, averaging about 23 points above the state in both 2024–2025 and 2025–2026, though individual results moved in different directions. Grade 9 PreACT Secure Science had the largest decline: the school score fell from 74% to 67%, and its lead over the state narrowed by 4 points, from 23 to 20 points. SchoolDigger ranks were 33rd of 697 in 2023–2024, 38th of 698 in 2024–2025, and 40th of 620 in 2025–2026; the ranking pools differed in size. The reported student-teacher ratio was 13.8 in 2024–2025, and 12% of students were free/reduced lunch eligible in 2021–2022. These figures provide context, not a basis for comparing local schools.
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