This was 10.8 percent higher than the state average of 48.4 percent. In 2020 the total municipality population reached 3,749.
97.1 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 | 76 | 2.9 |
| Regular high school diploma | 533 | 20.4 |
| GED or alternative credential | 65 | 2.5 |
| Some college, less than 1 year | 192 | 7.3 |
| Some college, 1 or more years, no degree | 202 | 7.7 |
| Associate's degree | 515 | 19.7 |
| Bachelor's degree | 789 | 30.2 |
| Master's degree | 244 | 9.3 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |

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