This was 24.6 percent lower than the state average of 37.7 percent. In 2020 the total municipality population reached 315.
79.5 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Port William for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 36 | 20.5 |
| Regular high school diploma | 59 | 33.5 |
| GED or alternative credential | 12 | 6.8 |
| Some college, less than 1 year | 14 | 8 |
| Some college, 1 or more years, no degree | 32 | 18.2 |
| Associate's degree | 13 | 7.4 |
| Bachelor's degree | 9 | 5.1 |
| Master's degree | 0 | 0 |
| Professional school degree | 1 | 0.6 |
| Doctorate degree | 0 | 0 |
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