This was 27.3 percent lower than the state average of 40.5 percent. In 2020 the total municipality population reached 340.
95.4 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in St. Marks for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 14 | 4.6 |
| Regular high school diploma | 63 | 20.8 |
| GED or alternative credential | 17 | 5.6 |
| Some college, less than 1 year | 8 | 2.6 |
| Some college, 1 or more years, no degree | 161 | 53.1 |
| Associate's degree | 11 | 3.6 |
| Bachelor's degree | 18 | 5.9 |
| Master's degree | 11 | 3.6 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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