| Index | St. Marys | Iowa | National |
| Average Test Scores | n/a | 69% | 48% |
| Student/Teacher ratio | n/a | 13:1 | 16:1 |
| Total public schools | n/a | 1,101 | 79,221 |
| Total private schools | n/a | 208 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
| Index | St. Marys | Iowa | National |
| Completed 8th grade | 97.6% | 89.2% | 84.3% |
| Completed high school | 97.6% | 87.7% | 83.0% |
| Completed some college | 75.6% | 59.8% | 59.4% |
| Completed associate degree | 35.7% | 38.4% | 38.5% |
| Completed bachelors | 28.0% | 27.2% | 30.3% |
| Completed masters | 7.7% | 8.7% | 11.5% |
| Completed professional degree | 0.0% | 2.7% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in St. Marys. Using the proficiency score averages, the average test scores for St. Marys, IA schools is n/a. The average student to teacher ratio is n/a. In St. Marys, IA, an average of 97.6% of students have completed 8th grade and an average of 97.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Norwalk, IA | 11,467 | 81% | 67.7% |
| Martensdale, IA | 504 | 76% | 57.8% |
| Indianola, IA | 15,921 | 74% | 54.0% |
| Carlisle, IA | 4,181 | 72% | 49.3% |
| Winterset, IA | 5,309 | 70% | 46.4% |
| St. Marys, IA | 182 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Green Mountain, IA | 182 | 75% | 55.2% |
| Kelly, WY | 183 | 70% | 45.8% |
| Marion, ND | 181 | 60% | 25.0% |
| Washta, IA | 183 | 67% | 39.6% |
| Carpenter, WY | 181 | 50% | 4.2% |
| St. Marys, IA | 182 | n/a |
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