| 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 | 672 | 65% | 35.4% |
| Hardin, IL | 831 | 44% | 7.8% |
| Jerseyville, IL | 7,860 | 40% | 16.0% |
| Brussels, IL | 113 | 35% | 27.1% |
| Medora, IL | 323 | 33% | 32.3% |
| Otterville, IL | 195 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Big Bend, CA | 195 | 50% | 4.2% |
| Deer Creek, MN | 195 | 50% | 4.2% |
| Plaza, ND | 195 | 58% | 19.8% |
| Caledonia, IL | 195 | 27% | 43.8% |
| Emerson, AR | 195 | 57% | 18.8% |
| Otterville, IL | 195 | n/a |
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