| Index | Stonington | Connecticut | National |
| Average Test Scores | 77% | 53% | 48% |
| Student/Teacher ratio | 16:1 | 14:1 | 16:1 |
| Total public schools | 1 | 654 | 79,221 |
| Total private schools | 2 | 207 | 24,874 |
| Total post-secondary schools | n/a | 81 | 7,963 |
| Index | Stonington | Connecticut | National |
| Completed 8th grade | 96.9% | 88.0% | 84.3% |
| Completed high school | 96.9% | 86.9% | 83.0% |
| Completed some college | 85.7% | 62.9% | 59.4% |
| Completed associate degree | 65.6% | 45.5% | 38.5% |
| Completed bachelors | 59.5% | 38.0% | 30.3% |
| Completed masters | 27.8% | 16.8% | 11.5% |
| Completed professional degree | 7.5% | 4.6% | 3.3% |
| Completed doctorate | 3.5% | 1.7% | 1.3% |
There are a total of 1 public schools, 2 private schools and n/a post-secondary schools in Stonington. Using the proficiency score averages, the average test scores for Stonington, CT schools is 77%. The average student to teacher ratio is 16:1. In Stonington, CT, an average of 96.9% of students have completed 8th grade and an average of 96.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Fishers Island, NY | 61 | 80% | 66.7% |
| Ashaway, RI | 1,444 | 72% | 50.0% |
| Charlestown, RI | 1,392 | 70% | 44.8% |
| Pawcatuck, CT | 5,024 | 68% | 42.4% |
| Hope Valley, RI | 1,888 | 67% | 39.6% |
| Stonington, CT | 899 | 77% | 60.4% |
| City | Population | Avg. Test Scores | National Avg. |
| McCloud, CA | 899 | 40% | 16.7% |
| Teton, ID | 899 | 70% | 45.8% |
| Sharpsville, IN | 899 | 42% | 12.5% |
| Rising Star, TX | 899 | 43% | 11.5% |
| Crocker, MO | 899 | 31% | 35.9% |
| Stonington, CT | 899 | 77% | 60.4% |
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