Summary:
ZIP code 54966 contains exactly one high school: Tri-County High, a grades 9–12 school with 180 students in Plainfield, Wisconsin, part of the Tri-County Area School District. Because there is only one high school here, the most meaningful comparisons are between this school and state averages.
Tri-County High's completion numbers are its strongest feature. It reports a 100% graduation rate, above the statewide 92.0%, and a dropout rate of 1.1% that matches the state exactly. Classes are small, with a student-teacher ratio of 11.1, and per-student spending is $18,676. About 56.67% of students qualify for free or reduced lunch, so the school serves a community with real economic need. The clearest warning sign is attendance: chronic absenteeism is 23.8%, higher than both the district (19.4%) and the state (17.3%) — nearly one in four students misses enough school to be considered chronically absent.
Academically, the school trails the state in every reported subject in both years, though the pattern is uneven. In 2025–2026, the largest gaps were in Social Studies (20.00% proficient versus 48.25%) and Mathematics (22.86% versus 42.93%), while English Language Arts and Science were much closer at 42.86% and 40.00%. Science and ELA improved sharply over the prior year, while Social Studies and Math declined. Rankings show gradual progress: the school moved from the bottom 5–7% in earlier years to the bottom 24% in 2025–2026, ranking 404 of 533 with 1 star, and the district ranks 381 of 432 statewide. With only 180 students, year-to-year swings can reflect just a few students, so these results should be read with caution.
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