| Index | Gardiner | Maine | National |
| Average Test Scores | 44% | 45% | 48% |
| Student/Teacher ratio | 16:1 | 14:1 | 16:1 |
| Total public schools | 5 | 345 | 79,221 |
| Total private schools | n/a | 89 | 24,874 |
| Total post-secondary schools | n/a | 45 | 7,963 |
| Index | Gardiner | Maine | National |
| Completed 8th grade | 88.6% | 88.3% | 84.3% |
| Completed high school | 87.8% | 86.8% | 83.0% |
| Completed some college | 62.7% | 58.8% | 59.4% |
| Completed associate degree | 34.8% | 39.0% | 38.5% |
| Completed bachelors | 23.8% | 29.3% | 30.3% |
| Completed masters | 8.5% | 10.5% | 11.5% |
| Completed professional degree | 2.2% | 3.0% | 3.3% |
| Completed doctorate | 1.2% | 1.3% | 1.3% |
There are a total of 5 public schools, n/a private schools and n/a post-secondary schools in Gardiner. Using the proficiency score averages, the average test scores for Gardiner, ME schools is 44%. The average student to teacher ratio is 16:1. In Gardiner, ME, an average of 88.6% of students have completed 8th grade and an average of 87.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Damariscotta, ME | 1,352 | 57% | 17.7% |
| Bowdoinham, ME | 748 | 52% | 8.3% |
| Winthrop, ME | 2,476 | 49% | 2.8% |
| Hallowell, ME | 2,444 | 47% | 2.1% |
| Farmingdale, ME | 2,451 | 45% | 7.3% |
| Gardiner, ME | 5,670 | 44% | 9.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Valparaiso, FL | 5,669 | 87% | 80.7% |
| Spring Grove, IL | 5,672 | 37% | 22.9% |
| Mount Carmel, PA | 5,672 | 48% | 0.7% |
| Webster, NY | 5,666 | 62% | 28.5% |
| Ballston Spa, NY | 5,675 | 65% | 34.4% |
| Gardiner, ME | 5,670 | 44% | 9.4% |
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