This was 21.4 percent lower than the state average of 40.2 percent. In 2020 the total municipality population reached 4,382.
73.9 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Hartwell for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 801 | 26.1 |
| Regular high school diploma | 778 | 25.3 |
| GED or alternative credential | 244 | 7.9 |
| Some college, less than 1 year | 115 | 3.7 |
| Some college, 1 or more years, no degree | 557 | 18.1 |
| Associate's degree | 245 | 8 |
| Bachelor's degree | 156 | 5.1 |
| Master's degree | 151 | 4.9 |
| Professional school degree | 19 | 0.6 |
| Doctorate degree | 8 | 0.3 |
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