This was 21.7 percent lower than the state average of 38.5 percent. In 2020 the total municipality population reached 411.
88.3 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Deary for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 37 | 11.7 |
| Regular high school diploma | 125 | 39.6 |
| GED or alternative credential | 12 | 3.8 |
| Some college, less than 1 year | 35 | 11.1 |
| Some college, 1 or more years, no degree | 54 | 17.1 |
| Associate's degree | 27 | 8.5 |
| Bachelor's degree | 23 | 7.3 |
| Master's degree | 3 | 0.9 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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