Plainfield's Tri-county High School is a Public School Serving students in Grades 09-12.
77.03% of students at this school are White, non-Hispanic
| Grades Offered | Grades 09-12 |
| Total Students | 222 |
| Student:Teacher ratio | 12:1 |
| Gender % | 54.05 % Male / 45.95 % Female |
| Total Classroom Teachers | 18.53 |
| Student Population at Tri-county High School by Grade | |
| Magnet School | |
| Charter School | |
| Shared School | |
| Title 1 Eligible |