This was 9.2 percent lower than the state average of 40.2 percent. In 2020 the total municipality population reached 317.
82.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Gillsville for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 35 | 17.2 |
| Regular high school diploma | 58 | 28.6 |
| GED or alternative credential | 10 | 4.9 |
| Some college, less than 1 year | 21 | 10.3 |
| Some college, 1 or more years, no degree | 16 | 7.9 |
| Associate's degree | 29 | 14.3 |
| Bachelor's degree | 27 | 13.3 |
| Master's degree | 7 | 3.4 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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