This was 28.8 percent lower than the state average of 43.7 percent. In 2020 the total municipality population reached 427.
93.1 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 | 20 | 6.9 |
| Regular high school diploma | 124 | 43.1 |
| GED or alternative credential | 31 | 10.8 |
| Some college, less than 1 year | 40 | 13.9 |
| Some college, 1 or more years, no degree | 30 | 10.4 |
| Associate's degree | 16 | 5.6 |
| Bachelor's degree | 16 | 5.6 |
| Master's degree | 2 | 0.7 |
| Professional school degree | 3 | 1 |
| Doctorate degree | 6 | 2.1 |
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