| Index | Groton | Connecticut | National |
| Average Test Scores | 51% | 53% | 48% |
| Student/Teacher ratio | 13:1 | 14:1 | 16:1 |
| Total public schools | 12 | 654 | 79,221 |
| Total private schools | 3 | 207 | 24,874 |
| Total post-secondary schools | 3 | 81 | 7,963 |
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| Index | Groton | Connecticut | National |
| Completed 8th grade | 88.7% | 88.0% | 84.3% |
| Completed high school | 88.7% | 86.9% | 83.0% |
| Completed some college | 56.8% | 62.9% | 59.4% |
| Completed associate degree | 34.1% | 45.5% | 38.5% |
| Completed bachelors | 29.2% | 38.0% | 30.3% |
| Completed masters | 15.0% | 16.8% | 11.5% |
| Completed professional degree | 4.0% | 4.6% | 3.3% |
| Completed doctorate | 2.7% | 1.7% | 1.3% |
There are a total of 12 public schools, 3 private schools and 3 post-secondary schools in Groton. Using the proficiency score averages, the average test scores for Groton, CT schools is 51%. The average student to teacher ratio is 13:1. In Groton, CT, an average of 88.7% of students have completed 8th grade and an average of 88.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Fishers Island, NY | 63 | 80% | 66.7% |
| Stonington, CT | 930 | 77% | 60.4% |
| Niantic, CT | 3,169 | 77% | 59.4% |
| Ashaway, RI | 1,489 | 72% | 50.0% |
| Pawcatuck, CT | 5,162 | 68% | 42.4% |
| Groton, CT | 9,279 | 51% | 5.6% |
| City | Population | Avg. Test Scores | National Avg. |
| LaSalle, IL | 9,282 | 17% | 65.6% |
| Cameron, MO | 9,284 | 51% | 6.9% |
| Sturgeon Bay, WI | 9,274 | 55% | 15.1% |
| Old Orchard Beach, ME | 9,273 | 41% | 15.6% |
| Brandywine, MD | 9,269 | 28% | 41.7% |
| Groton, CT | 9,279 | 51% | 5.6% |
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