| Index | Stonington | Illinois | National |
| Average Test Scores | 50% | 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 | Stonington | Illinois | National |
| Completed 8th grade | 87.0% | 86.2% | 84.3% |
| Completed high school | 85.6% | 84.7% | 83.0% |
| Completed some college | 43.9% | 61.8% | 59.4% |
| Completed associate degree | 23.5% | 40.7% | 38.5% |
| Completed bachelors | 15.6% | 32.9% | 30.3% |
| Completed masters | 4.0% | 12.7% | 11.5% |
| Completed professional degree | 0.4% | 3.4% | 3.3% |
| Completed doctorate | 0.4% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Stonington. Using the proficiency score averages, the average test scores for Stonington, IL schools is 50%. The average student to teacher ratio is n/a. In Stonington, IL, an average of 87.0% of students have completed 8th grade and an average of 85.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Illiopolis, IL | 767 | 38% | 20.3% |
| Niantic, IL | 657 | 37% | 22.9% |
| Morrisonville, IL | 1,123 | 32% | 34.4% |
| Taylorville, IL | 10,766 | 32% | 34.4% |
| Blue Mound, IL | 1,135 | 30% | 38.5% |
| Stonington, IL | 671 | 50% | 4.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Bandera, TX | 671 | 41% | 15.3% |
| Honeoye, NY | 671 | 47% | 2.1% |
| Bevier, MO | 671 | 45% | 6.8% |
| Geyserville, CA | 671 | 44% | 9.4% |
| Clear Lake, MN | 671 | 65% | 34.4% |
| Stonington, IL | 671 | 50% | 4.2% |
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