| 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 | 792 | 38% | 20.3% |
| Niantic, IL | 680 | 37% | 22.9% |
| Morrisonville, IL | 1,147 | 32% | 34.4% |
| Taylorville, IL | 11,059 | 32% | 34.4% |
| Blue Mound, IL | 1,171 | 30% | 38.5% |
| Stonington, IL | 686 | 50% | 4.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Waynesfield, OH | 686 | 73% | 52.6% |
| Mossyrock, WA | 686 | 57% | 18.8% |
| Blair, OK | 686 | 24% | 51.0% |
| New Home, TX | 686 | 75% | 56.3% |
| Colbert, GA | 685 | 54% | 12.5% |
| Stonington, IL | 686 | 50% | 4.2% |
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