This was 23.2 percent lower than the state average of 48.4 percent. In 2020 the total municipality population reached 267.
89.3 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Millville for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 17 | 10.7 |
| Regular high school diploma | 50 | 31.4 |
| GED or alternative credential | 0 | 0 |
| Some college, less than 1 year | 27 | 17 |
| Some college, 1 or more years, no degree | 25 | 15.7 |
| Associate's degree | 20 | 12.6 |
| Bachelor's degree | 17 | 10.7 |
| Master's degree | 1 | 0.6 |
| Professional school degree | 2 | 1.3 |
| Doctorate degree | 0 | 0 |
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