This was 1.2 percent lower than the state average of 39.6 percent. In 2020 the total municipality population reached 5,354.
93.4 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in St. Clair for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 247 | 6.6 |
| Regular high school diploma | 930 | 24.8 |
| GED or alternative credential | 76 | 2 |
| Some college, less than 1 year | 322 | 8.6 |
| Some college, 1 or more years, no degree | 737 | 19.6 |
| Associate's degree | 476 | 12.7 |
| Bachelor's degree | 640 | 17 |
| Master's degree | 252 | 6.7 |
| Professional school degree | 74 | 2 |
| Doctorate degree | 0 | 0 |

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