Summary:
Zip code 66521 has one high school, Onaga Senior High, serving grades 9–12 and enrolling 86 students. Its reported achievement results are above state figures in ELA, math, and science, and its strongest showing is in science: 63% proficient, compared with 38% statewide, a 25-point advantage.
Onaga Senior High is the only listed school, so there is no local top or bottom school to compare; the clearest benchmark is the state. In 2025–2026, the school was 7 points above the state in all-grades ELA (53% versus 46%) and 12 points above in math (53% versus 41%), alongside its 25-point science lead. Matched-grade results also favored Onaga: 10th-grade ELA was 53% versus 41% statewide, 10th-grade math was 53% versus 37%, and 11th-grade science was 63% versus 30%. With only one school and 86 students, these figures cannot show how local schools compare with one another, and small enrollment can make results sensitive to the performance of a limited number of students.
Recent results show an important exception to the generally favorable comparisons: Onaga’s math proficiency fell by 5 points, from 58% in 2024–2025 to 53% in 2025–2026, while the state rose by 2 points; the math gap narrowed from 19 points to 12. ELA was essentially unchanged at 53%, while the state rose from 44% to 46%, narrowing Onaga’s advantage from 8 points to 7. SchoolDigger’s ranking improved from 36th of 318 schools (89th percentile) in 2023–2024 to 28th of 340 (92nd percentile) in 2025–2026. Other context is mixed against the district: graduation was 93%, matching the Onaga-Havensville-Wheaton district and 3 points above the state, while chronic absenteeism was 17%, 1 point below the state but 4 points above the district. The student–teacher ratio was 9.8, and the free/reduced-lunch rate was 36%.
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