| Index | Plainfield | Indiana | National |
| Average Test Scores | 73% | 47% | 48% |
| Student/Teacher ratio | 21:1 | 22:1 | 16:1 |
| Total public schools | 9 | 1,755 | 79,221 |
| Total private schools | 3 | 675 | 24,874 |
| Total post-secondary schools | 1 | 141 | 7,963 |
| Index | Plainfield | Indiana | National |
| Completed 8th grade | 87.8% | 84.6% | 84.3% |
| Completed high school | 87.1% | 82.9% | 83.0% |
| Completed some college | 60.6% | 53.8% | 59.4% |
| Completed associate degree | 39.1% | 33.0% | 38.5% |
| Completed bachelors | 30.8% | 24.6% | 30.3% |
| Completed masters | 11.2% | 8.9% | 11.5% |
| Completed professional degree | 2.9% | 2.4% | 3.3% |
| Completed doctorate | 1.6% | 1.0% | 1.3% |
There are a total of 9 public schools, 3 private schools and 1 post-secondary schools in Plainfield. Using the proficiency score averages, the average test scores for Plainfield, IN schools is 73%. The average student to teacher ratio is 21:1. In Plainfield, IN, an average of 87.8% of students have completed 8th grade and an average of 87.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| North Salem, IN | 493 | 82% | 70.4% |
| Brownsburg, IN | 24,072 | 78% | 62.6% |
| Amo, IN | 598 | 72% | 49.6% |
| Pittsboro, IN | 3,181 | 69% | 43.4% |
| Bargersville, IN | 6,824 | 69% | 42.4% |
| Plainfield, IN | 30,318 | 73% | 50.8% |
| City | Population | Avg. Test Scores | National Avg. |
| North Royalton, OH | 30,302 | 85% | 77.3% |
| Jamestown, NY | 30,345 | 45% | 5.9% |
| Chicago Heights, IL | 30,349 | 23% | 52.8% |
| Lake Stevens, WA | 30,352 | 63% | 30.0% |
| Liberty, MO | 30,239 | 54% | 12.6% |
| Plainfield, IN | 30,318 | 73% | 50.8% |
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