Summary:
Zip code 61957 has two schools in Windsor, Illinois: Windsor Elementary School, serving prekindergarten through grade 6, and Windsor Junior & Senior High School, serving grades 7–12. Together, they enroll 359 students. The most important finding is the high school’s sharply different subject results: its 2025–26 ELA proficiency is well above the state rate, while its math proficiency is well below it.
On all-grade 2025–26 IAR results, the high school leads in ELA: 71% proficient, compared with 61% at the elementary school, an 11-point gap. Both exceed the state’s 56%—the high school by 15 points and the elementary school by 4. The elementary school leads in math, with 48% proficient versus 22% at the high school, a 25-point difference; the elementary result is 8 points above the state’s 40%, while the high school is 17 points below. Elementary grades 3–5 also exceed state rates in ELA and math, but grade 6 ELA is 38%, versus 59% statewide. Because the schools serve different grades, their all-grade results are not a like-for-like comparison.
Both schools improved from 2024–25 to 2025–26: elementary ELA rose 14 points and math 8, while high-school ELA rose 29 points and math 5. The high school’s math result remains a concern despite that gain. SchoolDigger rankings also rose: the high school moved from the 21st percentile in 2023–24 to the 71st in 2025–26, and the elementary school from the 53rd to the 62nd. The high school has a lower student-teacher ratio (9.8 versus 12.6) and less free/reduced lunch eligibility in 2024–25 (37% versus 45%). Its chronic absenteeism is higher, however: 14% compared with 7% at the elementary school.
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