This was 12.9 percent lower than the state average of 41.8 percent. In 2020 the total municipality population reached 573.
93.7 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Mellen for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 28 | 6.3 |
| Regular high school diploma | 147 | 32.9 |
| GED or alternative credential | 16 | 3.6 |
| Some college, less than 1 year | 61 | 13.6 |
| Some college, 1 or more years, no degree | 66 | 14.8 |
| Associate's degree | 67 | 15 |
| Bachelor's degree | 56 | 12.5 |
| Master's degree | 6 | 1.3 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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