This was 10.8 percent lower than the state average of 40.9 percent. In 2020 the total municipality population reached 374.
97.6 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Gayville for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 7 | 2.4 |
| Regular high school diploma | 86 | 30.1 |
| GED or alternative credential | 24 | 8.4 |
| Some college, less than 1 year | 23 | 8 |
| Some college, 1 or more years, no degree | 60 | 21 |
| Associate's degree | 29 | 10.1 |
| Bachelor's degree | 42 | 14.7 |
| Master's degree | 14 | 4.9 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 1 | 0.3 |
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