This was 21.8 percent lower than the state average of 41 percent. In 2020 the total municipality population reached 365.
88.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Mahaffey for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 35 | 11.2 |
| Regular high school diploma | 178 | 56.9 |
| GED or alternative credential | 2 | 0.6 |
| Some college, less than 1 year | 12 | 3.8 |
| Some college, 1 or more years, no degree | 26 | 8.3 |
| Associate's degree | 41 | 13.1 |
| Bachelor's degree | 18 | 5.8 |
| Master's degree | 0 | 0 |
| Professional school degree | 1 | 0.3 |
| Doctorate degree | 0 | 0 |
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