| Index | St. Marys | Pennsylvania | National |
| Average Test Scores | 61% | 55% | 48% |
| Student/Teacher ratio | 17:1 | 16:1 | 16:1 |
| Total public schools | 3 | 2,563 | 79,221 |
| Total private schools | 3 | 1,626 | 24,874 |
| Total post-secondary schools | n/a | 406 | 7,963 |
| Index | St. Marys | Pennsylvania | National |
| Completed 8th grade | 89.1% | 86.9% | 84.3% |
| Completed high school | 88.0% | 85.6% | 83.0% |
| Completed some college | 43.8% | 53.6% | 59.4% |
| Completed associate degree | 30.8% | 37.4% | 38.5% |
| Completed bachelors | 19.3% | 29.3% | 30.3% |
| Completed masters | 5.9% | 11.5% | 11.5% |
| Completed professional degree | 1.6% | 3.3% | 3.3% |
| Completed doctorate | 0.5% | 1.4% | 1.3% |
There are a total of 3 public schools, 3 private schools and n/a post-secondary schools in St. Marys. Using the proficiency score averages, the average test scores for St. Marys, PA schools is 61%. The average student to teacher ratio is 17:1. In St. Marys, PA, an average of 89.1% of students have completed 8th grade and an average of 88.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Ridgway, PA | 3,781 | 69% | 43.1% |
| Kersey, PA | 1,022 | 67% | 39.6% |
| Brockway, PA | 2,042 | 63% | 30.2% |
| Johnsonburg, PA | 2,304 | 57% | 18.8% |
| Weedville, PA | 460 | 55% | 14.6% |
| St. Marys, PA | 12,333 | 61% | 26.7% |
| City | Population | Avg. Test Scores | National Avg. |
| New Baltimore, MI | 12,333 | 59% | 22.1% |
| Gulfport, FL | 12,334 | 27% | 44.4% |
| Streator, IL | 12,337 | 22% | 54.2% |
| Lincolnwood, IL | 12,338 | 50% | 4.7% |
| Speedway, IN | 12,327 | 62% | 29.5% |
| St. Marys, PA | 12,333 | 61% | 26.7% |
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