This was 1.6 percent lower than the state average of 47.4 percent. In 2020 the total municipality population reached 442.
86.7 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in McMullin for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 49 | 13.3 |
| Regular high school diploma | 65 | 17.6 |
| GED or alternative credential | 7 | 1.9 |
| Some college, less than 1 year | 20 | 5.4 |
| Some college, 1 or more years, no degree | 59 | 16 |
| Associate's degree | 93 | 25.2 |
| Bachelor's degree | 51 | 13.8 |
| Master's degree | 25 | 6.8 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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