EC—4 Enrollment ……………………. 258 Grades 5-8 Enrollment ……………….. 230 Grades 7-12 Enrollment ……………… 217 Teachers …..……………………………..59 Size of District ……………….225 sq. miles 14 Taxing Municipalities The Tri-County Area School District is located in Plainfield, Waushara County, Wisconsin, right off of Interstate 39/Highway 51. Plainfield is 20 miles south of Stevens Point, 80 miles south of Wausau, and 90 miles north of Madison. There is one K-12 building — the newest classroom addition was occupied in December 1996. A new weight room/community fitness center was built during the summer of 2007.