This was 13.8 percent higher than the state average of 41.1 percent. In 2020 the total municipality population reached 7,615.
96.9 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Decorah for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 132 | 3.1 |
| Regular high school diploma | 970 | 22.5 |
| GED or alternative credential | 66 | 1.5 |
| Some college, less than 1 year | 321 | 7.4 |
| Some college, 1 or more years, no degree | 458 | 10.6 |
| Associate's degree | 478 | 11.1 |
| Bachelor's degree | 1,022 | 23.7 |
| Master's degree | 524 | 12.1 |
| Professional school degree | 102 | 2.4 |
| Doctorate degree | 241 | 5.6 |
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