Summary:
Zip code 66521 includes three schools in the Onaga-Havensville-Wheaton district, serving students from prekindergarten through grade 12: Onaga Elementary, Onaga Middle School, and Onaga Senior High. The clearest overall strength is the high school: it is above state proficiency in ELA, math, and science, and its graduation rate is also higher than the state’s.
Onaga Senior High is the most consistent standout, with 53% proficiency in ELA and math and 63% in science—about 7, 12, and 25 percentage points above the state, respectively. Its graduation rate was 93%, compared with 90% statewide. Onaga Middle School leads the group in ELA at 58%, 6 points above the high school and 12 above the state. Onaga Elementary has the lowest all-grade ELA and math results—47% and 44%—but its science result, 60%, is close to the high school’s 63% and 22 points above the state. Middle-school science is the group’s lowest subject result at 40%, though it remains slightly above the state.
Recent changes vary by school and subject. Elementary ELA rose 8 points and science rose 27 points from 2024–25 to 2025–26, while grade 4 results remain a concern: ELA was 21 points and math 15 points below the state. At the middle school, ELA rose 10 points, but math fell 11; grade 6 was below the state in both ELA and math, unlike grades 7 and 8. High-school ELA was essentially flat and math fell 5 points, though both remained above state results. SchoolDigger ranks the high school 28th of 340 with five stars, the middle school 82nd of 368 with four stars, and the elementary school 292nd of 657 with three stars. The high school also has the lowest student-teacher ratio (9.8) and free/reduced-lunch rate (36%); the middle school has the highest ratio (14.9), and the elementary school the highest lunch rate (54%). These figures describe the schools and do not explain their results.
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