This was 22.8 percent lower than the state average of 47.4 percent. In 2020 the total municipality population reached 2,797.
90.1 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Grottoes for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 200 | 9.9 |
| Regular high school diploma | 714 | 35.5 |
| GED or alternative credential | 163 | 8.1 |
| Some college, less than 1 year | 204 | 10.1 |
| Some college, 1 or more years, no degree | 237 | 11.8 |
| Associate's degree | 157 | 7.8 |
| Bachelor's degree | 259 | 12.9 |
| Master's degree | 77 | 3.8 |
| Professional school degree | 2 | less than 0.1 |
| Doctorate degree | 0 | 0 |
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