This was 17.8 percent lower than the state average of 41.9 percent. In 2020 the total municipality population reached 586.
86.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Grantsboro for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 58 | 13.2 |
| Regular high school diploma | 155 | 35.3 |
| GED or alternative credential | 18 | 4.1 |
| Some college, less than 1 year | 16 | 3.6 |
| Some college, 1 or more years, no degree | 86 | 19.6 |
| Associate's degree | 60 | 13.7 |
| Bachelor's degree | 37 | 8.4 |
| Master's degree | 7 | 1.6 |
| Professional school degree | 2 | 0.5 |
| Doctorate degree | 0 | 0 |
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