Summary:
ZIP code 61736 has one high school, Tri-Valley High School, serving grades 9–12 and enrolling 329 students. Its reported context includes a student–teacher ratio of 13.4 and, in 2024–2025, 9% free/reduced lunch eligible. Most importantly, in 2025–2026 the school’s proficiency exceeded the Illinois rate in all nine reported subject-and-grade results, by 10 to 33 percentage points.
With no other high school in the ZIP code, there is no local school-to-school top or bottom to identify; Tri-Valley stands out in comparison with the state. Its largest leads were in 10th-grade science, at 81% proficient versus 48% statewide, and 11th-grade ELA, at 82% versus 50%. Its smallest lead was in ninth-grade mathematics: 53% versus 42%. Across the three reported grades and tests, its average advantage was 26 points in ELA, 25 in science, and 22 in mathematics.
Recent results improved in grades 10 and 11 but fell in all three grade 9 subjects: grade 11 gains ranged from 8 to 11 points, and grade 10 gains were 3 to 7 points, while grade 9 declined 8 points in ELA, 10 in mathematics, and 15 in science. Even after those declines, grade 9 remained above state proficiency rates in every subject. SchoolDigger ranked Tri-Valley 41st of 620 Illinois schools, in the 93rd percentile, with five stars for 2025–2026. Graduation was 100%, compared with 90% statewide. Chronic absenteeism was 21%, below the state’s 24% but above the Tri Valley CUSD 3 rate of 12%.
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