This was 16.6 percent higher than the state average of 43.7 percent. In 2020 the total municipality population reached 21,843.
95.9 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Darien for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 665 | 4.1 |
| Regular high school diploma | 2,380 | 14.6 |
| GED or alternative credential | 223 | 1.4 |
| Some college, less than 1 year | 825 | 5 |
| Some college, 1 or more years, no degree | 2,399 | 14.7 |
| Associate's degree | 1,041 | 6.4 |
| Bachelor's degree | 5,638 | 34.5 |
| Master's degree | 2,284 | 14 |
| Professional school degree | 512 | 3.1 |
| Doctorate degree | 371 | 2.3 |
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