This was 17.4 percent lower than the state average of 41 percent. In 2020 the total municipality population reached 601.
95.2 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Grassflat for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 18 | 4.8 |
| Regular high school diploma | 169 | 44.8 |
| GED or alternative credential | 34 | 9 |
| Some college, less than 1 year | 39 | 10.3 |
| Some college, 1 or more years, no degree | 28 | 7.4 |
| Associate's degree | 37 | 9.8 |
| Bachelor's degree | 47 | 12.5 |
| Master's degree | 5 | 1.3 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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