Summary:
ZIP code 54966 in Plainfield, Wisconsin is served by three public schools — Tri-County Elementary (PK–5), Tri-County Middle (6–8), and Tri-County High (9–12) — all part of the Tri-County Area School District and all sharing one campus at 409 S West St. Together they enroll 579 students: 265 in elementary (about 45.8%), 180 in high school (about 31.1%), and 134 in middle school (about 23.1%). The district overall ranks 381st of 432 in Wisconsin — the 12th percentile, with 1 star.
Each school has its own bright spot. Tri-County Middle is the strongest overall, ranking 435th of 643 schools (32nd percentile, 2 stars) and improving each year; its 6th-grade math proficiency was 86.67% in 2025–2026 versus 53.60% statewide. Tri-County Elementary has the lowest chronic absenteeism at 15.2%, below the district's 19.4% and the state's 17.3%, plus 4th-grade social studies at 70.59% versus 65.51% statewide. Tri-County High reports a 100.0% graduation rate, above the state's 92.0%.
Still, all three schools trail state averages on test proficiency overall, and each has weak spots. Elementary math is below state in every reported grade, with 3rd grade at 25.00% versus 54.75%. Middle school 8th grade is below state in ELA, math, science, and social studies. At the high school, chronic absenteeism is 23.8% and no 2025–2026 test was above state, with Social Studies at 20.00% versus 48.25%. Per-student spending is highest at the high school ($18,676) despite its lowest proficiency, and free/reduced-price lunch rates range from 56.67% to 64.53% across the three schools.
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