This was 24.7 percent lower than the state average of 47.4 percent. In 2020 the total municipality population reached 1,003.
86.4 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Gratton for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 98 | 13.6 |
| Regular high school diploma | 325 | 45.1 |
| GED or alternative credential | 15 | 2.1 |
| Some college, less than 1 year | 32 | 4.4 |
| Some college, 1 or more years, no degree | 87 | 12.1 |
| Associate's degree | 120 | 16.6 |
| Bachelor's degree | 44 | 6.1 |
| Master's degree | 0 | 0 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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