This was 20.5 percent lower than the state average of 48.4 percent. In 2020 the total municipality population reached 282.
95.9 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Plummer for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 8 | 4.1 |
| Regular high school diploma | 70 | 35.5 |
| GED or alternative credential | 2 | 1 |
| Some college, less than 1 year | 28 | 14.2 |
| Some college, 1 or more years, no degree | 34 | 17.3 |
| Associate's degree | 34 | 17.3 |
| Bachelor's degree | 18 | 9.1 |
| Master's degree | 1 | 0.5 |
| Professional school degree | 2 | 1 |
| Doctorate degree | 0 | 0 |
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