This number was 12.6 percent lower than the state average of 41 percent. In 2019 the total municipality population reached 755.
93.1 percent of the population had at least a high school diploma or the equivalent. The table below shows how many Plain residents who were at least 25 years old in 2019 held each of the listed degrees.
Degree distribution in Plain for 2019*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 38 | 6.9 |
| Regular high school diploma | 212 | 38.4 |
| GED or alternative credential | 9 | 1.6 |
| Some college, less than 1 year | 53 | 9.6 |
| Some college, 1 or more years, no degree | 83 | 15 |
| Associate's degree | 50 | 9.1 |
| Bachelor's degree | 78 | 14.1 |
| Master's degree | 23 | 4.2 |
| Professional school degree | 2 | 0.4 |
| Doctorate degree | 4 | 0.7 |
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