This was 12.9 percent lower than the state average of 46.3 percent. In 2020 the total municipality population reached 1,274.
89.9 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Delevan for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 83 | 10.1 |
| Regular high school diploma | 242 | 29.5 |
| GED or alternative credential | 73 | 8.9 |
| Some college, less than 1 year | 67 | 8.2 |
| Some college, 1 or more years, no degree | 81 | 9.9 |
| Associate's degree | 114 | 13.9 |
| Bachelor's degree | 84 | 10.2 |
| Master's degree | 73 | 8.9 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 3 | 0.4 |
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