This was 22.4 percent lower than the state average of 38.1 percent. In 2020 the total municipality population reached 415.
85.5 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Petrolia for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 46 | 14.5 |
| Regular high school diploma | 144 | 45.3 |
| GED or alternative credential | 3 | 0.9 |
| Some college, less than 1 year | 25 | 7.9 |
| Some college, 1 or more years, no degree | 50 | 15.7 |
| Associate's degree | 30 | 9.4 |
| Bachelor's degree | 16 | 5 |
| Master's degree | 4 | 1.3 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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