Summary:
Plainfield High School is the only high school in Plainfield Community School Corp, serving grades 9–12 to 1,856 students in Plainfield, Indiana. Because the district has just one high school, there are no in-district school-to-school comparisons to make; the meaningful benchmarks are against the state and over time. By those measures, the school is a standout: Plainfield Community School Corp ranks 22nd of 374 districts (94th percentile, 5 stars), and the high school itself has placed in the 91st–94th percentile of Indiana high schools with 5 stars in each of the last three years — 26th of 415 in 2025–2026, rebounding from 40th of 429 in 2024–2025.
Academically, SAT results are the school's biggest strength. In 2025–2026, 69.18% of students were proficient in Evidence-based Reading and Writing versus 51.9% statewide, and 43.24% in Math versus 25.6% statewide — roughly 17 to 18 percentage points above state averages in both subjects. The graduation rate is 96.0%, which is 6.3 points above the state's 89.7%, and chronic absenteeism is 13.8%, which is 2.9 points below the state's 16.7%. ILEARN Biology End-of-Course proficiency rose from 48.01% to 57.53%, a gain of 9.52 points, and the school was above the state's 45.6% in 2024–2025.
A few items are worth watching. SAT ERW fell 4.48 points year over year (73.66% to 69.18%), while SAT Math was essentially flat (43.17% to 43.24%). Reading/Writing remains far stronger than Math, a gap of nearly 26 points within the school. Biology, although improving, stayed below the district's reported figures (57.53% vs 66.9%; 48.01% vs 59.71%), and chronic absenteeism runs 2.1 points above the district's 11.7%. For context, 29.69% of students qualify for free/reduced lunch, per-student spending is $9,813, and the student-teacher ratio is 21.5:1.
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