This was 20.2 percent lower than the state average of 38 percent. In 2020 the total municipality population reached 477.
61.6 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Oak Grove for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 123 | 38.4 |
| Regular high school diploma | 71 | 22.2 |
| GED or alternative credential | 26 | 8.1 |
| Some college, less than 1 year | 26 | 8.1 |
| Some college, 1 or more years, no degree | 17 | 5.3 |
| Associate's degree | 22 | 6.9 |
| Bachelor's degree | 28 | 8.8 |
| Master's degree | 3 | 0.9 |
| Professional school degree | 4 | 1.2 |
| Doctorate degree | 0 | 0 |
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