This was 6.5 percent higher than the state average of 35.7 percent. In 2020 the total municipality population reached 4,010.
92.1 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Shackle Island for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 222 | 7.9 |
| Regular high school diploma | 646 | 22.9 |
| GED or alternative credential | 66 | 2.3 |
| Some college, less than 1 year | 273 | 9.7 |
| Some college, 1 or more years, no degree | 425 | 15.1 |
| Associate's degree | 214 | 7.6 |
| Bachelor's degree | 494 | 17.5 |
| Master's degree | 255 | 9 |
| Professional school degree | 84 | 3 |
| Doctorate degree | 144 | 5.1 |
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