| Index | Plainfield | Iowa | National |
| Average Test Scores | n/a | 69% | 48% |
| Student/Teacher ratio | n/a | 13:1 | 16:1 |
| Total public schools | n/a | 1,101 | 79,221 |
| Total private schools | n/a | 208 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
| Index | Plainfield | Iowa | National |
| Completed 8th grade | 90.8% | 89.2% | 84.3% |
| Completed high school | 90.8% | 87.7% | 83.0% |
| Completed some college | 48.8% | 59.8% | 59.4% |
| Completed associate degree | 33.9% | 38.4% | 38.5% |
| Completed bachelors | 13.7% | 27.2% | 30.3% |
| Completed masters | 2.7% | 8.7% | 11.5% |
| Completed professional degree | 0.0% | 2.7% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Plainfield. Using the proficiency score averages, the average test scores for Plainfield, IA schools is n/a. The average student to teacher ratio is n/a. In Plainfield, IA, an average of 90.8% of students have completed 8th grade and an average of 90.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Denver, IA | 1,759 | 90% | 87.2% |
| Waverly, IA | 10,172 | 81% | 68.3% |
| Janesville, IA | 1,051 | 77% | 60.4% |
| Shell Rock, IA | 1,646 | 77% | 60.4% |
| New Hampton, IA | 3,413 | 77% | 60.1% |
| Plainfield, IA | 405 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Allen, NE | 405 | 45% | 6.3% |
| Malone, TX | 405 | 37% | 22.9% |
| Thayer, KS | 405 | 35% | 28.1% |
| Troutville, VA | 405 | 86% | 78.6% |
| Downsville, NY | 405 | 30% | 38.5% |
| Plainfield, IA | 405 | n/a |
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