| 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 |
| 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 | 13,346 | 71% | 46.9% |
| Fernandina Beach, FL | 12,622 | 70% | 44.8% |
| Kingsland, GA | 17,523 | 60% | 24.2% |
| Woodbine, GA | 1,322 | 55% | 14.6% |
| St. Marys, GA | 18,321 | 63% | 31.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Harrison, NJ | 18,313 | 41% | 15.1% |
| Eloy, AZ | 18,306 | 28% | 41.5% |
| Menasha, WI | 18,280 | 36% | 25.1% |
| Bensenville, IL | 18,273 | 29% | 40.1% |
| Cameron Park, CA | 18,370 | 59% | 23.7% |
| St. Marys, GA | 18,321 | 63% | 31.3% |
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