Summary:
Zip code 46135 is home to two public high schools serving grades 9–12: Greencastle High School, with 497 students, and South Putnam High School, with 354 students. Together they enroll 851 high school students across two districts — Greencastle Community School Corp and South Putnam Community Schools — giving families in this area two distinct options.
Academically, the two schools have recently traded places. Greencastle has climbed steadily in state school rankings, from 174 of 432 in 2023–2024 to 144 of 429 and then 80 of 415 in 2025–2026, moving into the top fifth of ranked Indiana high schools with 4 stars. South Putnam rose to 76 of 429 in 2024–2025 but slipped to 134 of 415 (3 stars) in 2025–2026. That reversal also appears in test results: South Putnam outperformed Greencastle on all three reported assessments in 2024–2025, while Greencastle led on all three in 2025–2026 — Biology ILEARN (61.68% vs 59.52%), SAT Evidence-based Reading and Writing (51.89% vs 43.04%) and SAT Math (27.36% vs 25.32%).
South Putnam's clearest advantages are attendance and completion. Its graduation rate of 90.6% is above the state's 89.7% and above Greencastle's 86.3%, while its chronic absenteeism of 13.9% is below the state's 16.7% and far below Greencastle's 24.0%. South Putnam also spends more per student ($14,711 vs $11,828) while maintaining a nearly identical student-teacher ratio (14.7 vs 14.6), and its district ranks higher (56 of 374 vs 111 of 374). Neither school dominates on every metric — South Putnam stands out for attendance, graduation and spending, and Greencastle for size and recent academic momentum.
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