Best High Schools in Delavan, IL

Delavan, Illinois, has one high school, Delavan High School, serving grades 9–12 with 129 students. There are no other schools in this list for a school-to-school comparison. The most important finding is that the school’s grade 11 ACT advantage over the state narrowed sharply: its average gap across ELA, mathematics, and science fell from 23 points in 2024–2025 to 7 points in 2025–2026, with the latest mathematics result 8 points below the state.

With only one school, Delavan High School is both the highest and lowest school in the group by default; its results can instead be compared with state results. On the latest ACT, ELA was its strongest subject relative to the state, 22 points higher, and science was 9 points higher, while mathematics was 8 points lower. Its reported 2025–2026 PreACT Secure results were all above state levels: by 8 points in grade 9 ELA, 18 in grade 10 ELA, 1 in grade 9 mathematics, and 9 in grade 10 science; two other results are state-suppressed. The graduation rate was 83%, below the state’s 90%, while chronic absenteeism was 17%, below the state’s 24%.

Results changed differently across tests and grades. Between 2024–2025 and 2025–2026, ACT scores fell 6 points in ELA, 23 in mathematics, and 20 in science, while state scores changed by −2, +1, and −1 points, respectively. PreACT grade 10 ELA went the other way: it rose 8 points as the state fell 2, widening the school’s advantage from 8 to 18 points. SchoolDigger’s ranking percentile rose from 47 to 84, then eased to 77; its star rating increased from 2 to 4 and remained at 4. Context figures include an 11.9 student–teacher ratio in 2024–2025 and 30% free/reduced lunch eligible in 2024–2025; these describe the school, but the data provide no peer schools for comparison.