This was 25 percent lower than the state average of 48.4 percent. In 2020 the total municipality population reached 522.
83.4 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Green Isle for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 56 | 16.6 |
| Regular high school diploma | 137 | 40.5 |
| GED or alternative credential | 13 | 3.8 |
| Some college, less than 1 year | 7 | 2.1 |
| Some college, 1 or more years, no degree | 46 | 13.6 |
| Associate's degree | 30 | 8.9 |
| Bachelor's degree | 43 | 12.7 |
| Master's degree | 4 | 1.2 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 2 | 0.6 |
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