This was 23.1 percent lower than the state average of 41 percent. In 2020 the total municipality population reached 513.
87.1 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Delta for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 47 | 12.9 |
| Regular high school diploma | 151 | 41.6 |
| GED or alternative credential | 20 | 5.5 |
| Some college, less than 1 year | 34 | 9.4 |
| Some college, 1 or more years, no degree | 46 | 12.7 |
| Associate's degree | 18 | 5 |
| Bachelor's degree | 29 | 8 |
| Master's degree | 10 | 2.8 |
| Professional school degree | 8 | 2.2 |
| Doctorate degree | 0 | 0 |
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