This was 0.4 percent lower than the state average of 44.8 percent. In 2020 the total municipality population reached 159.
90.6 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 | 11 | 9.4 |
| Regular high school diploma | 24 | 20.5 |
| GED or alternative credential | 4 | 3.4 |
| Some college, less than 1 year | 5 | 4.3 |
| Some college, 1 or more years, no degree | 21 | 17.9 |
| Associate's degree | 24 | 20.5 |
| Bachelor's degree | 20 | 17.1 |
| Master's degree | 7 | 6 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 1 | 0.9 |
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