| Index | Plainfield | Pennsylvania | National |
| Average Test Scores | n/a | 55% | 48% |
| Student/Teacher ratio | n/a | 16:1 | 16:1 |
| Total public schools | n/a | 2,563 | 79,221 |
| Total private schools | n/a | 1,626 | 24,874 |
| Total post-secondary schools | n/a | 406 | 7,963 |
| Index | Plainfield | Pennsylvania | National |
| Completed 8th grade | 89.3% | 86.9% | 84.3% |
| Completed high school | 89.3% | 85.6% | 83.0% |
| Completed some college | 40.3% | 53.6% | 59.4% |
| Completed associate degree | 21.5% | 37.4% | 38.5% |
| Completed bachelors | 3.4% | 29.3% | 30.3% |
| Completed masters | 3.4% | 11.5% | 11.5% |
| Completed professional degree | 0.0% | 3.3% | 3.3% |
| Completed doctorate | 0.0% | 1.4% | 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, PA schools is n/a. The average student to teacher ratio is n/a. In Plainfield, PA, an average of 89.3% of students have completed 8th grade and an average of 89.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Mechanicsburg, PA | 8,977 | 67% | 39.9% |
| Boiling Springs, PA | 3,107 | 65% | 35.9% |
| Newville, PA | 1,231 | 63% | 31.5% |
| Shippensburg, PA | 5,621 | 62% | 29.9% |
| York Springs, PA | 1,028 | 61% | 27.8% |
| Plainfield, PA | 278 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Sawyer, ND | 278 | 50% | 4.2% |
| Meridian, CA | 278 | 29% | 38.9% |
| Lu Verne, IA | 278 | 75% | 56.3% |
| Shickley, NE | 278 | 60% | 25.0% |
| Harrison, ID | 279 | 38% | 21.9% |
| Plainfield, PA | 278 | n/a |
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