This was 17.3 percent lower than the state average of 46.3 percent. In 2020 the total municipality population reached 2,647.
88.5 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Green Island for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 204 | 11.5 |
| Regular high school diploma | 707 | 39.8 |
| GED or alternative credential | 121 | 6.8 |
| Some college, less than 1 year | 107 | 6 |
| Some college, 1 or more years, no degree | 123 | 6.9 |
| Associate's degree | 219 | 12.3 |
| Bachelor's degree | 189 | 10.6 |
| Master's degree | 100 | 5.6 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 8 | 0.4 |
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