This was 16 percent lower than the state average of 41.9 percent. In 2020 the total municipality population reached 177.
90.2 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Harrellsville for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 11 | 9.8 |
| Regular high school diploma | 35 | 31.2 |
| GED or alternative credential | 18 | 16.1 |
| Some college, less than 1 year | 0 | 0 |
| Some college, 1 or more years, no degree | 19 | 17 |
| Associate's degree | 20 | 17.9 |
| Bachelor's degree | 9 | 8 |
| Master's degree | 0 | 0 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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