This was 21.2 percent lower than the state average of 40.9 percent. In 2020 the total municipality population reached 1,816.
70.6 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Oglala for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 267 | 29.4 |
| Regular high school diploma | 142 | 15.7 |
| GED or alternative credential | 59 | 6.5 |
| Some college, less than 1 year | 0 | 0 |
| Some college, 1 or more years, no degree | 260 | 28.7 |
| Associate's degree | 137 | 15.1 |
| Bachelor's degree | 18 | 2 |
| Master's degree | 24 | 2.6 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |

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