This was 6.6 percent higher than the state average of 41.8 percent. In 2020 the total municipality population reached 593.
94 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in St. Joseph for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 22 | 6 |
| Regular high school diploma | 122 | 33.2 |
| GED or alternative credential | 0 | 0 |
| Some college, less than 1 year | 5 | 1.4 |
| Some college, 1 or more years, no degree | 41 | 11.1 |
| Associate's degree | 23 | 6.2 |
| Bachelor's degree | 106 | 28.8 |
| Master's degree | 46 | 12.5 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 3 | 0.8 |
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