This was 12 percent lower than the state average of 41 percent. In 2020 the total municipality population reached 1,130.
82.3 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Greenfields for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 141 | 17.7 |
| Regular high school diploma | 330 | 41.4 |
| GED or alternative credential | 39 | 4.9 |
| Some college, less than 1 year | 23 | 2.9 |
| Some college, 1 or more years, no degree | 33 | 4.1 |
| Associate's degree | 0 | 0 |
| Bachelor's degree | 150 | 18.8 |
| Master's degree | 53 | 6.6 |
| Professional school degree | 20 | 2.5 |
| Doctorate degree | 8 | 1 |
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