Plainfield South High School

Plainfield South High School, a well-populated senior high in Plainfield, Illinois, run under Plainfield SD 202, enrolls 2,323 students, covering grades 9 through 12. By comparison, Illinois's public schools average about 834 students each, so Plainfield South High School sits 179% above that benchmark.

Across the 30 schools in Plainfield SD 202 (24,556 students total), Plainfield South High School accounts for its share of the district's footprint.

For racial and ethnic makeup, Plainfield South High School reports that the most-represented group is White (42%), with the rest of the student body spread across multiple groups. The remainder comes out to 31% Hispanic, 20% Black, 4% multiracial, 3% Asian. The wider county runs roughly 65% White, putting the school's mix visibly less White than the area baseline.

Looking at school resources, Staff filings list 137 full-time-equivalent teachers, which works out to roughly 17.0:1 students per teacher. Statewide, the average ratio sits near 13.8:1, putting Plainfield South High School higher than the state norm the norm. Roughly 34% of students at Plainfield South High School qualify for free or reduced-price lunch, often used as a Title I proxy.

On a residual basis (actual vs predicted given the student mix), Plainfield South High School performs roughly as the BeatsExpectations model predicts for a school with this FRL share. The predicted value is around 51.8%, the actual is 43.0%, a residual of -8.8 points.

In the broader community, community-level numbers for Kendall County indicate median household income runs about $111,601, roughly 37% of adults have completed at least a four-year degree, and roughly 5% of residents live below the federal poverty line. In all, Kendall County runs 50 public schools (combined enrollment of about 29,773 students), of which Plainfield South High School is one.

The closest other public school is Charles Reed Elementary Sch, roughly 0.5 miles away. 8 of the 8 nearest public schools sit inside a five-mile radius. Ranking that nearby cluster on reported proficiency puts Plainfield South High School at 6th of 9; the average score across the group is 43.1%.

The campus sits in a bedroom-community setting.

Looking at the recent track record. Over the past 7-year window, the student count fell 8%: 2,521 students in 2018 compared to 2,323 in 2025. White enrollment moved from 57% to 42% across the same window. Class-load math has tightened: from 18.2:1 in 2018 to 17.0:1 in 2025.

Within the allk12 community for this school, recent activity here tends to focus on sports schedules, lunch menu changes, and school spirit week. Posting is open to anyone connected to the school.