This was 11.6 percent higher than the state average of 43.7 percent. In 2020 the total municipality population reached 32,612.
94.3 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in St. Charles for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 1,281 | 5.7 |
| Regular high school diploma | 3,365 | 15.1 |
| GED or alternative credential | 458 | 2.1 |
| Some college, less than 1 year | 1,515 | 6.8 |
| Some college, 1 or more years, no degree | 3,355 | 15 |
| Associate's degree | 1,689 | 7.6 |
| Bachelor's degree | 6,367 | 28.5 |
| Master's degree | 3,404 | 15.3 |
| Professional school degree | 468 | 2.1 |
| Doctorate degree | 417 | 1.9 |
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