This was 22.8 percent lower than the state average of 40.2 percent. In 2020 the total municipality population reached 758.
84.4 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Plains for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 68 | 15.6 |
| Regular high school diploma | 125 | 28.7 |
| GED or alternative credential | 96 | 22 |
| Some college, less than 1 year | 36 | 8.3 |
| Some college, 1 or more years, no degree | 35 | 8 |
| Associate's degree | 14 | 3.2 |
| Bachelor's degree | 34 | 7.8 |
| Master's degree | 15 | 3.4 |
| Professional school degree | 8 | 1.8 |
| Doctorate degree | 5 | 1.1 |
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