This was 21.5 percent higher than the state average of 46.3 percent. In 2020 the total municipality population reached 8,016.
96 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Port Jefferson for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 237 | 4 |
| Regular high school diploma | 777 | 13.2 |
| GED or alternative credential | 104 | 1.8 |
| Some college, less than 1 year | 274 | 4.7 |
| Some college, 1 or more years, no degree | 502 | 8.5 |
| Associate's degree | 424 | 7.2 |
| Bachelor's degree | 1,290 | 21.9 |
| Master's degree | 1,403 | 23.9 |
| Professional school degree | 443 | 7.5 |
| Doctorate degree | 425 | 7.2 |
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