This was 22.9 percent higher than the state average of 47.8 percent. In 2020 the total municipality population reached 899.
96.5 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Stonington borough for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 25 | 3.5 |
| Regular high school diploma | 62 | 8.7 |
| GED or alternative credential | 7 | 1 |
| Some college, less than 1 year | 36 | 5 |
| Some college, 1 or more years, no degree | 79 | 11.1 |
| Associate's degree | 49 | 6.9 |
| Bachelor's degree | 181 | 25.4 |
| Master's degree | 150 | 21 |
| Professional school degree | 63 | 8.8 |
| Doctorate degree | 62 | 8.7 |
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