This was 10.8 percent lower than the state average of 41.1 percent. In 2020 the total municipality population reached 787.
94.2 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 | 31 | 5.8 | 
| Regular high school diploma | 178 | 33.1 | 
| GED or alternative credential | 24 | 4.5 | 
| Some college, less than 1 year | 45 | 8.4 | 
| Some college, 1 or more years, no degree | 97 | 18 | 
| Associate's degree | 92 | 17.1 | 
| Bachelor's degree | 66 | 12.3 | 
| Master's degree | 5 | 0.9 | 
| Professional school degree | 0 | 0 | 
| Doctorate degree | 0 | 0 | 

 
               
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