Summary:
ZIP code 61734 has one high school, Delavan High School, serving grades 9–12 with 129 students. Its clearest strength is English language arts: in 2025–2026, proficiency was above Illinois results in all three reported grade-and-test comparisons, by 8 to 22 percentage points.
Delavan stands out on ELA and science, while grade 11 ACT math is its clearest weakness against the state. ELA proficiency was 71% versus 50% on the grade 11 ACT, 71% versus 54% on the grade 10 PreACT, and 70% versus 62% on the grade 9 PreACT. Science was also above the state: 57% versus 48% on the grade 11 ACT and 57% versus 48% on the grade 10 PreACT. In contrast, grade 11 ACT math was 31% versus 40%, an 8-point shortfall; grade 9 PreACT math was 44% versus 42%, just 1 point higher. The grade 10 PreACT math result is suppressed, so it cannot be compared. Graduation was 83%, 7 points below the state’s 90%, while chronic absenteeism was 17%, 6 points below the state’s 24%.
Results are mixed over time: from 2024–2025 to 2025–2026, grade 11 ACT proficiency fell 6 points in ELA, 23 in math, and 20 in science; despite those declines, ELA and science remained above state results. PreACT changes included an 8-point rise in grade 10 ELA and a 6-point rise in grade 9 math, while grade 9 ELA slipped 1 point. SchoolDigger ranked Delavan at the 47th percentile in 2023–2024, the 84th in 2024–2025, and the 77th in 2025–2026, with ratings rising from 2 stars to 4 and then holding. The school’s student–teacher ratio was 11.9:1 in 2024–2025, and 30% of students were free/reduced lunch eligible that school year. With just one school listed, there is no meaningful school-to-school comparison.
Thank you for your feedback!