This was 23 percent lower than the state average of 37.7 percent. In 2020 the total municipality population reached 682.
94.4 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Adena for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 28 | 5.6 |
| Regular high school diploma | 260 | 52.4 |
| GED or alternative credential | 28 | 5.6 |
| Some college, less than 1 year | 50 | 10.1 |
| Some college, 1 or more years, no degree | 57 | 11.5 |
| Associate's degree | 40 | 8.1 |
| Bachelor's degree | 24 | 4.8 |
| Master's degree | 9 | 1.8 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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