This was 10.7 percent lower than the state average of 31.3 percent. In 2020 the total municipality population reached 1,536.
77.1 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Decatur city for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 214 | 22.9 |
| Regular high school diploma | 364 | 39 |
| GED or alternative credential | 76 | 8.1 |
| Some college, less than 1 year | 27 | 2.9 |
| Some college, 1 or more years, no degree | 61 | 6.5 |
| Associate's degree | 41 | 4.4 |
| Bachelor's degree | 113 | 12.1 |
| Master's degree | 35 | 3.7 |
| Professional school degree | 3 | 0.3 |
| Doctorate degree | 0 | 0 |
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