| Index | Greencastle | Indiana | National |
| Average Test Scores | 47% | 46% | 48% |
| Student/Teacher ratio | 20:1 | 22:1 | 16:1 |
| Total public schools | 9 | 1,755 | 79,221 |
| Total private schools | 2 | 675 | 24,874 |
| Total post-secondary schools | 1 | 141 | 7,963 |
| Index | Greencastle | Indiana | National |
| Completed 8th grade | 81.0% | 84.6% | 84.3% |
| Completed high school | 79.6% | 82.9% | 83.0% |
| Completed some college | 45.7% | 53.8% | 59.4% |
| Completed associate degree | 27.3% | 33.0% | 38.5% |
| Completed bachelors | 17.2% | 24.6% | 30.3% |
| Completed masters | 8.4% | 8.9% | 11.5% |
| Completed professional degree | 4.2% | 2.4% | 3.3% |
| Completed doctorate | 3.8% | 1.0% | 1.3% |
There are a total of 9 public schools, 2 private schools and 1 post-secondary schools in Greencastle. Using the proficiency score averages, the average test scores for Greencastle, IN schools is 47%. The average student to teacher ratio is 20:1. In Greencastle, IN, an average of 81.0% of students have completed 8th grade and an average of 79.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Amo, IN | 527 | 72% | 50.0% |
| Roachdale, IN | 695 | 59% | 23.6% |
| Bainbridge, IN | 688 | 58% | 19.8% |
| Cloverdale, IN | 1,905 | 56% | 17.0% |
| Fillmore, IN | 517 | 55% | 14.6% |
| Greencastle, IN | 10,312 | 47% | 2.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Fredonia, NY | 10,311 | 65% | 34.7% |
| Amelia, OH | 10,308 | 69% | 43.2% |
| Hillsdale, NJ | 10,317 | 71% | 46.9% |
| Sauk Village, IL | 10,319 | 6% | 88.0% |
| Cottage Grove, OR | 10,302 | 43% | 11.2% |
| Greencastle, IN | 10,312 | 47% | 2.1% |
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