| Index | Plainville | Illinois | National |
| Average Test Scores | n/a | 33% | 48% |
| Student/Teacher ratio | n/a | 18:1 | 16:1 |
| Total public schools | n/a | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | Plainville | Illinois | National |
| Completed 8th grade | 80.2% | 86.2% | 84.3% |
| Completed high school | 78.3% | 84.7% | 83.0% |
| Completed some college | 54.1% | 61.8% | 59.4% |
| Completed associate degree | 25.1% | 40.7% | 38.5% |
| Completed bachelors | 10.1% | 32.9% | 30.3% |
| Completed masters | 2.4% | 12.7% | 11.5% |
| Completed professional degree | 0.0% | 3.4% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Plainville. Using the proficiency score averages, the average test scores for Plainville, IL schools is n/a. The average student to teacher ratio is n/a. In Plainville, IL, an average of 80.2% of students have completed 8th grade and an average of 78.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Hannibal, MO | 17,312 | 49% | 2.3% |
| Liberty, IL | 398 | 41% | 15.1% |
| Quincy, IL | 40,111 | 28% | 41.8% |
| Barry, IL | 1,698 | 27% | 43.2% |
| Kinderhook, IL | 307 | 27% | 43.8% |
| Plainville, IL | 285 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| New Castle, VA | 285 | 75% | 55.2% |
| Desert Center, CA | 285 | 30% | 37.5% |
| Swanville, MN | 285 | 50% | 3.1% |
| Neelyville, MO | 285 | 57% | 18.8% |
| Chester, SD | 285 | 60% | 24.5% |
| Plainville, IL | 285 | n/a |
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