This was 2.4 percent lower than the state average of 42.7 percent. In 2020 the total municipality population reached 1,673.
93.2 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Plainville for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 73 | 6.8 |
| Regular high school diploma | 279 | 26.1 |
| GED or alternative credential | 51 | 4.8 |
| Some college, less than 1 year | 97 | 9.1 |
| Some college, 1 or more years, no degree | 139 | 13 |
| Associate's degree | 132 | 12.3 |
| Bachelor's degree | 236 | 22 |
| Master's degree | 53 | 4.9 |
| Professional school degree | 10 | 0.9 |
| Doctorate degree | 1 | less than 0.1 |
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