| Index | Otterville | 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 | Otterville | Illinois | National |
| Completed 8th grade | 64.0% | 86.2% | 84.3% |
| Completed high school | 61.3% | 84.7% | 83.0% |
| Completed some college | 29.3% | 61.8% | 59.4% |
| Completed associate degree | 6.7% | 40.7% | 38.5% |
| Completed bachelors | 0.0% | 32.9% | 30.3% |
| Completed masters | 0.0% | 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 Otterville. Using the proficiency score averages, the average test scores for Otterville, IL schools is n/a. The average student to teacher ratio is n/a. In Otterville, IL, an average of 64.0% of students have completed 8th grade and an average of 61.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Grafton, IL | 688 | 65% | 35.4% |
| Hardin, IL | 855 | 44% | 7.8% |
| Jerseyville, IL | 8,030 | 40% | 16.0% |
| Brussels, IL | 117 | 35% | 27.1% |
| Medora, IL | 330 | 33% | 32.3% |
| Otterville, IL | 201 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Emerson, AR | 201 | 57% | 18.8% |
| Marble City, OK | 201 | 20% | 58.3% |
| Laurel, IA | 200 | 80% | 66.7% |
| Caledonia, IL | 200 | 27% | 43.8% |
| Yolo, CA | 200 | 5% | 89.6% |
| Otterville, IL | 201 | n/a |