This was 13.8 percent lower than the state average of 36 percent. In 2020 the total municipality population reached 9,700.
90.6 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Decatur for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 633 | 9.4 |
| Regular high school diploma | 2,673 | 39.8 |
| GED or alternative credential | 382 | 5.7 |
| Some college, less than 1 year | 584 | 8.7 |
| Some college, 1 or more years, no degree | 949 | 14.1 |
| Associate's degree | 623 | 9.3 |
| Bachelor's degree | 686 | 10.2 |
| Master's degree | 168 | 2.5 |
| Professional school degree | 7 | 0.1 |
| Doctorate degree | 10 | 0.1 |
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