Summary:
The Armstrong Township HSD 225 list has one school, Armstrong High School, serving grades 9–12, with 114 students. In 2025–2026, graduation was 88%, compared with 90% statewide, while chronic absenteeism was 25%, compared with 24% statewide. The most important finding is that Armstrong was below Illinois in six of seven reported test comparisons, with the largest shortfalls in science and English language arts.
Armstrong High School is both the top and bottom school in the area by default, since there are no other schools to compare. Its strongest reported result was grade 9 mathematics: 42.3%, just 0.2 percentage points above the state’s 42.1%. Its weakest was grade 9 science, where 39% were proficient versus 47% statewide, a gap of 9 points. English language arts was also below the state in all three reported grades: the shortfalls were 8 points in grade 9, 9 points in grade 10 and 2 points in grade 11. Grade 10 and grade 11 mathematics results were suppressed, so the available figures do not show how the school performs in mathematics overall.
Across seven grade-and-test comparisons available in both years, Armstrong’s average gap from the state widened from about 1 point below in 2024–2025 to about 5 points below in 2025–2026. The average gap worsened by about 5 points, as Armstrong’s average result fell by 5 points while the state’s fell by about 1 point. SchoolDigger’s ranking also fell from the 62nd percentile in 2024–2025 to the 44th percentile in 2025–2026, though it remained above its 23rd-percentile standing in 2023–2024. The school had a student–teacher ratio of 8.1 and 38% free/reduced lunch eligible in 2024–2025; these figures describe the school’s context, not the cause of its results.
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