This was 5.4 percent higher than the state average of 37.7 percent. In 2020 the total municipality population reached 5,080.
96 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in St. Clairsville for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 157 | 4 |
| Regular high school diploma | 1,162 | 30 |
| GED or alternative credential | 73 | 1.9 |
| Some college, less than 1 year | 267 | 6.9 |
| Some college, 1 or more years, no degree | 548 | 14.1 |
| Associate's degree | 422 | 10.9 |
| Bachelor's degree | 738 | 19 |
| Master's degree | 356 | 9.2 |
| Professional school degree | 60 | 1.5 |
| Doctorate degree | 94 | 2.4 |
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