Plainfield South High School
Plainfield, IL · High School · Grades 9-12
Plainfield South High School is a high school in Plainfield, IL with 2,411 students enrolled and a 62% proficiency rate. Part of Plainfield SD 202. NCES data from the U.S. Department of Education.
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About This School
Plainfield South High School is a high school located in Plainfield, Illinois. The school serves 2,411 students in grades 9-12. The student-to-teacher ratio is 17.6:1.
According to EDFacts assessment data, 62% of students meet grade-level proficiency standards in combined math and reading. The school reports a 72% graduation rate.
39% of students qualify for free or reduced-price lunch.
Plainfield South High School is part of the Plainfield SD 202 in Illinois.
How This School Compares
Plainfield South High School has 2,411 students enrolled, making it larger than the average school in Plainfield SD 202 (829 students). Its 62% proficiency rate is 8 percentage points above the district average of 54%. Compared to the Illinois state average of 48%, the school performs 14 points higher.
Frequently Asked Questions
Plainfield South High School has 2,411 students enrolled in grades 9-12. The student-to-teacher ratio is 17.6:1.
According to EDFacts data, 62% of students at Plainfield South High School meet grade-level proficiency standards in combined math and reading assessments.
Plainfield South High School has a 72% graduation rate, measuring the percentage of students who graduate within four years.
Plainfield South High School is part of the Plainfield SD 202 in Plainfield, Illinois. You can view all schools in this district on the district page.
All data on this page comes from the National Center for Education Statistics (NCES) Common Core of Data and EDFacts assessment results. These are official federal datasets published by the U.S. Department of Education.
School profiles are built from NCES directory data and EDFacts assessment results. Proficiency rates reflect combined math and reading performance. Graduation rates are reported for high schools with available data.
The this entity record above pulls directly from NCES Common Core of Data and EDFacts. What follows is the per-entity context — how this entity sits in the broader U.S. K-12 school outcomes and enrollment distribution and which underlying factors drive the headline numbers.
The methodology behind every numeric value on this page is publicly documented on the NCES Common Core of Data and EDFacts portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for this entity’s peers within U.S. public schools and districts. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
Source: NCES Common Core of Data, 2026.