This was 21.1 percent lower than the state average of 38.1 percent. In 2020 the total municipality population reached 6,278.
75.7 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Port Isabel for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 1,028 | 24.3 |
| Regular high school diploma | 1,630 | 38.5 |
| GED or alternative credential | 229 | 5.4 |
| Some college, less than 1 year | 129 | 3 |
| Some college, 1 or more years, no degree | 500 | 11.8 |
| Associate's degree | 201 | 4.7 |
| Bachelor's degree | 360 | 8.5 |
| Master's degree | 123 | 2.9 |
| Professional school degree | 16 | 0.4 |
| Doctorate degree | 19 | 0.4 |
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