This was 25.3 percent lower than the state average of 38.1 percent. In 2020 the total municipality population reached 819.
70.3 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in O'Donnell for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 172 | 29.7 |
| Regular high school diploma | 104 | 18 |
| GED or alternative credential | 78 | 13.5 |
| Some college, less than 1 year | 55 | 9.5 |
| Some college, 1 or more years, no degree | 96 | 16.6 |
| Associate's degree | 12 | 2.1 |
| Bachelor's degree | 50 | 8.6 |
| Master's degree | 3 | 0.5 |
| Professional school degree | 6 | 1 |
| Doctorate degree | 3 | 0.5 |
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