| Index | Marionville | Missouri | National |
| Average Test Scores | 56% | 44% | 48% |
| Student/Teacher ratio | 14:1 | 14:1 | 16:1 |
| Total public schools | 2 | 1,899 | 79,221 |
| Total private schools | n/a | 531 | 24,874 |
| Total post-secondary schools | n/a | 213 | 7,963 |
| Index | Marionville | Missouri | National |
| Completed 8th grade | 81.7% | 86.0% | 84.3% |
| Completed high school | 79.1% | 84.2% | 83.0% |
| Completed some college | 45.0% | 57.7% | 59.4% |
| Completed associate degree | 17.2% | 35.2% | 38.5% |
| Completed bachelors | 8.7% | 27.6% | 30.3% |
| Completed masters | 3.7% | 10.4% | 11.5% |
| Completed professional degree | 0.9% | 2.8% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of 2 public schools, n/a private schools and n/a post-secondary schools in Marionville. Using the proficiency score averages, the average test scores for Marionville, MO schools is 56%. The average student to teacher ratio is 14:1. In Marionville, MO, an average of 81.7% of students have completed 8th grade and an average of 79.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Battlefield, MO | 6,375 | 70% | 45.8% |
| Republic, MO | 16,571 | 59% | 21.9% |
| Mount Vernon, MO | 4,490 | 48% | 0.3% |
| Clever, MO | 2,742 | 43% | 9.9% |
| Billings, MO | 908 | 41% | 15.1% |
| Marionville, MO | 2,633 | 56% | 17.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Summit, MS | 2,633 | 40% | 16.1% |
| Brooklyn, IN | 2,633 | 52% | 8.3% |
| Tool, TX | 2,633 | 72% | 50.0% |
| Winamac, IN | 2,634 | 52% | 7.3% |
| East Newark, NJ | 2,634 | 45% | 7.3% |
| Marionville, MO | 2,633 | 56% | 17.4% |
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