Summary:
Plainfield is home to three public schools — Tri-County Elementary (PK–5, 265 students), Tri-County Middle (6–8, 134 students), and Tri-County High (9–12, 180 students) — all part of the Tri-County Area School District and all sharing the same address at 409 S West St. Together they serve 579 students. The district overall ranks 381st of 432 in Wisconsin, at the 12th percentile with 1 star, but the individual schools differ far more than that shared district label suggests.
Tri-County Middle is the strongest current performer: ranked 435 of 643, 32nd percentile, 2 stars, up from 1 star in each of the two prior years. Its 6th grade math result — 86.67% proficient versus the state's 53.6% — is the best score in the entire data set, and 6th grade ELA at 63.33% also beats the state. Tri-County High stands out for a 100% graduation rate against the state's 92% and the biggest rank improvement in the group, moving from the 5th to the 24th percentile, though it also has the highest chronic absenteeism at 23.8%. Tri-County Elementary has the lowest absenteeism at 15.2%, better than both district (19.4%) and state (17.3%), plus a strong 4th grade social studies result of 70.59%.
Weak spots matter just as much. Middle school 8th grade ELA (28.89%) and science (31.11%) fall well below state averages, and elementary 3rd grade math sits at 25% versus the state's 54.75%. At the high school, 10th grade social studies is 20% and math ACT is 22.86%. All three schools serve high shares of low-income students, ranging from 56.67% to 64.53%, and each has improved its rank percentile over three years — so parents should read these results as a mix of real momentum and persistent academic gaps.
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