| Index | St. Mary's | Colorado | National |
| Average Test Scores | n/a | 39% | 48% |
| Student/Teacher ratio | n/a | 17:1 | 16:1 |
| Total public schools | n/a | 1,426 | 79,221 |
| Total private schools | n/a | 384 | 24,874 |
| Total post-secondary schools | n/a | 138 | 7,963 |
| Index | St. Mary's | Colorado | National |
| Completed 8th grade | 100.0% | 87.9% | 84.3% |
| Completed high school | 100.0% | 87.1% | 83.0% |
| Completed some college | 49.5% | 69.3% | 59.4% |
| Completed associate degree | 22.0% | 47.1% | 38.5% |
| Completed bachelors | 13.6% | 38.7% | 30.3% |
| Completed masters | 13.6% | 14.3% | 11.5% |
| Completed professional degree | 7.0% | 3.9% | 3.3% |
| Completed doctorate | 0.0% | 1.6% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in St. Mary's. Using the proficiency score averages, the average test scores for St. Mary's, CO schools is n/a. The average student to teacher ratio is n/a. In St. Mary's, CO, an average of 100.0% of students have completed 8th grade and an average of 100.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Fraser, CO | 1,304 | 52% | 8.3% |
| Black Hawk, CO | 98 | 48% | 0.5% |
| Nederland, CO | 1,465 | 46% | 4.7% |
| Georgetown, CO | 1,205 | 45% | 6.3% |
| Idaho Springs, CO | 1,848 | 25% | 49.0% |
| St. Mary's, CO | 416 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Powhatan, VA | 416 | 83% | 73.5% |
| Au Sable Forks, NY | 416 | 42% | 12.5% |
| Hurley, SD | 416 | 35% | 28.1% |
| Grover Hill, OH | 417 | 80% | 65.6% |
| Thomaston, AL | 415 | 22% | 54.2% |
| St. Mary's, CO | 416 | n/a |
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