This was 15.5 percent lower than the state average of 37.7 percent. In 2020 the total municipality population reached 20,094.
83.2 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Portsmouth for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 2,230 | 16.8 |
| Regular high school diploma | 4,119 | 31 |
| GED or alternative credential | 1,042 | 7.8 |
| Some college, less than 1 year | 1,349 | 10.1 |
| Some college, 1 or more years, no degree | 1,612 | 12.1 |
| Associate's degree | 998 | 7.5 |
| Bachelor's degree | 1,195 | 9 |
| Master's degree | 450 | 3.4 |
| Professional school degree | 180 | 1.4 |
| Doctorate degree | 132 | 1 |
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