Summary:
Monticello CUSD 25 has one high school, Monticello High School, serving grades 9–12 and enrolling 489 students. With no other high schools in this list, Illinois results provide the useful comparison. The clearest overall finding is that Monticello exceeded state results in all nine reported tests in 2025–2026, by 4 to 21 percentage points.
Monticello’s strongest relative results were in ELA: its advantages over the state averaged 17 percentage points across the three tests, led by a 21-point edge on grade 11 ACT ELA. Math was its weakest subject relative to the state, with an average advantage of 7 points and a smallest edge of 4 points in grade 9—but the school still beat the state in every math result. Graduation was also strong at 96%, compared with 90% statewide, while chronic absenteeism was higher: 25% at the school, versus 24% statewide and 14% districtwide.
Results shifted in mixed directions, and the average advantage over the state narrowed slightly, from 12.4 to 11.8 percentage points. The biggest contraction was in grade 10 PreACT science: the school’s result fell 8 points while the state’s fell 1, bringing the school’s lead down from 11 points to 5. SchoolDigger’s school ranking improved from 185th of 697 schools (73rd percentile) in 2023–2024 to 104th of 620 (83rd percentile) in 2025–2026, after reaching 89th (87th percentile) the year before. SchoolDigger separately ranks the district 186th of 738 and gives it four stars. Other context for families: the school’s student-teacher ratio was 13.5 to 1 in 2024–2025, and 26% of students were free/reduced lunch eligible in 2021–2022.
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