This was 27 percent lower than the state average of 38 percent. In 2020 the total municipality population reached 188.
83.1 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Gilliam for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 20 | 16.9 |
| Regular high school diploma | 38 | 32.2 |
| GED or alternative credential | 3 | 2.5 |
| Some college, less than 1 year | 12 | 10.2 |
| Some college, 1 or more years, no degree | 32 | 27.1 |
| Associate's degree | 9 | 7.6 |
| Bachelor's degree | 4 | 3.4 |
| Master's degree | 0 | 0 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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