This was 23.8 percent lower than the state average of 38 percent. In 2020 the total municipality population reached 261.
79 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in St. Mary for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 37 | 21 |
| Regular high school diploma | 67 | 38.1 |
| GED or alternative credential | 13 | 7.4 |
| Some college, less than 1 year | 17 | 9.7 |
| Some college, 1 or more years, no degree | 17 | 9.7 |
| Associate's degree | 7 | 4 |
| Bachelor's degree | 7 | 4 |
| Master's degree | 10 | 5.7 |
| Professional school degree | 1 | 0.6 |
| Doctorate degree | 0 | 0 |
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