This was 5.5 percent higher than the state average of 48.5 percent. In 2020 the total municipality population reached 415.
96.6 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Plainfield for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 9 | 3.4 |
| Regular high school diploma | 53 | 20.2 |
| GED or alternative credential | 0 | 0 |
| Some college, less than 1 year | 26 | 9.9 |
| Some college, 1 or more years, no degree | 33 | 12.5 |
| Associate's degree | 55 | 20.9 |
| Bachelor's degree | 65 | 24.7 |
| Master's degree | 14 | 5.3 |
| Professional school degree | 4 | 1.5 |
| Doctorate degree | 4 | 1.5 |
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