| Index | St. Marys | Georgia | National |
| Average Test Scores | 63% | 42% | 48% |
| Student/Teacher ratio | 16:1 | 16:1 | 16:1 |
| Total public schools | 5 | 2,164 | 79,221 |
| Total private schools | 1 | 515 | 24,874 |
| Total post-secondary schools | n/a | 192 | 7,963 |


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| Index | St. Marys | Georgia | National |
| Completed 8th grade | 87.7% | 82.3% | 84.3% |
| Completed high school | 87.7% | 81.0% | 83.0% |
| Completed some college | 64.5% | 57.8% | 59.4% |
| Completed associate degree | 38.2% | 36.8% | 38.5% |
| Completed bachelors | 26.4% | 29.4% | 30.3% |
| Completed masters | 11.0% | 11.1% | 11.5% |
| Completed professional degree | 1.5% | 3.2% | 3.3% |
| Completed doctorate | 0.9% | 1.3% | 1.3% |
There are a total of 5 public schools, 1 private schools and n/a post-secondary schools in St. Marys. Using the proficiency score averages, the average test scores for St. Marys, GA schools is 63%. The average student to teacher ratio is 16:1. In St. Marys, GA, an average of 87.7% of students have completed 8th grade and an average of 87.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Yulee, FL | 13,794 | 71% | 46.9% |
| Fernandina Beach, FL | 13,006 | 70% | 44.8% |
| Kingsland, GA | 18,088 | 60% | 24.2% |
| Woodbine, GA | 1,370 | 55% | 14.6% |
| St. Marys, GA | 18,720 | 63% | 31.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Harrison, NJ | 18,732 | 41% | 15.1% |
| Ashtabula, OH | 18,701 | 54% | 12.8% |
| Somerset, MA | 18,700 | 56% | 17.3% |
| North Aurora, IL | 18,754 | 32% | 34.4% |
| Burlington, KY | 18,755 | 53% | 10.9% |
| St. Marys, GA | 18,720 | 63% | 31.3% |