This was 11 percent lower than the state average of 39.6 percent. In 2020 the total municipality population reached 2,101.
94.6 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 | 77 | 5.4 |
| Regular high school diploma | 457 | 32 |
| GED or alternative credential | 63 | 4.4 |
| Some college, less than 1 year | 203 | 14.2 |
| Some college, 1 or more years, no degree | 220 | 15.4 |
| Associate's degree | 184 | 12.9 |
| Bachelor's degree | 103 | 7.2 |
| Master's degree | 104 | 7.3 |
| Professional school degree | 10 | 0.7 |
| Doctorate degree | 7 | 0.5 |

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