This was 12 percent lower than the state average of 41.1 percent. In 2020 the total municipality population reached 182.
97.9 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in St. Marys for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 3 | 2.1 |
| Regular high school diploma | 42 | 29.8 |
| GED or alternative credential | 2 | 1.4 |
| Some college, less than 1 year | 11 | 7.8 |
| Some college, 1 or more years, no degree | 42 | 29.8 |
| Associate's degree | 15 | 10.6 |
| Bachelor's degree | 17 | 12.1 |
| Master's degree | 9 | 6.4 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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