This was 13.8 percent lower than the state average of 43.7 percent. In 2020 the total municipality population reached 1,481.
92.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Greenfield for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 69 | 7.2 |
| Regular high school diploma | 380 | 39.6 |
| GED or alternative credential | 78 | 8.1 |
| Some college, less than 1 year | 49 | 5.1 |
| Some college, 1 or more years, no degree | 96 | 10 |
| Associate's degree | 89 | 9.3 |
| Bachelor's degree | 148 | 15.4 |
| Master's degree | 37 | 3.9 |
| Professional school degree | 4 | 0.4 |
| Doctorate degree | 9 | 0.9 |
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