This was 5.8 percent higher than the state average of 48 percent. In 2020 the total municipality population reached 4,281.
96.5 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Plymouth for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 76 | 3.5 |
| Regular high school diploma | 279 | 13 |
| GED or alternative credential | 109 | 5.1 |
| Some college, less than 1 year | 97 | 4.5 |
| Some college, 1 or more years, no degree | 433 | 20.1 |
| Associate's degree | 103 | 4.8 |
| Bachelor's degree | 666 | 30.9 |
| Master's degree | 332 | 15.4 |
| Professional school degree | 22 | 1 |
| Doctorate degree | 35 | 1.6 |
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