Summary:
Zip code 61088 has one listed high school, Winnebago High School, serving grades 9–12, with 422 students and a 12.1:1 student–teacher ratio in 2024–2025. In 2025–2026, its proficiency results were above Illinois’ in seven of nine matched subject and grade comparisons. Its clearest advantage was ninth-grade PreACT Secure mathematics: 55% proficient versus 42% statewide, a 13-point lead.
Winnebago High School is the only school in the list, so there is no local top-versus-bottom comparison. Its strongest overall pattern is in grade 9, where it exceeded the state in ELA by 8 points, math by 13, and science by 7; it was also above the state in all three grade 11 ACT subjects, by 1 to 6 points. Grade 10 results were close to state levels: ELA was 1 point lower, while math and science were essentially even. Other outcomes are mixed: graduation was 83% versus 90% statewide, and dropout was 3% versus 2%; chronic absenteeism was lower, at 13% versus 24%.
Results improved overall relative to the state, but varied by grade and subject. The equal-weighted average across the nine matched results rose from 50% for the school and 48% for Illinois in 2024–2025 to 51% and 47% in 2025–2026, widening the school’s advantage by 2 points. Ninth-grade results rose in all three subjects, including a 16-point gain in math, while grade 11 ELA fell 10 points and grade 10 math and science each fell about 3. SchoolDigger’s reported percentile declined from the 74th in 2023–2024 to the 70th in 2025–2026, even as its latest rank improved to 184 of 620 from 193 of 698 the prior year. The school reported 27.7% free/reduced lunch eligible in 2024–2025; this and its staffing ratio provide context, not an explanation for results.
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