This was 13.3 percent lower than the state average of 43.2 percent. In 2020 the total municipality population reached 451.
96.4 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Petersburg for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 10 | 3.6 |
| Regular high school diploma | 103 | 36.7 |
| GED or alternative credential | 11 | 3.9 |
| Some college, less than 1 year | 30 | 10.7 |
| Some college, 1 or more years, no degree | 43 | 15.3 |
| Associate's degree | 43 | 15.3 |
| Bachelor's degree | 31 | 11 |
| Master's degree | 10 | 3.6 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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