This was 5.9 percent lower than the state average of 31.4 percent. In 2020 the total municipality population reached 17,746.
77.7 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Gretna for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 2,964 | 22.3 |
| Regular high school diploma | 2,777 | 20.9 |
| GED or alternative credential | 695 | 5.2 |
| Some college, less than 1 year | 1,645 | 12.4 |
| Some college, 1 or more years, no degree | 1,821 | 13.7 |
| Associate's degree | 540 | 4.1 |
| Bachelor's degree | 1,814 | 13.6 |
| Master's degree | 642 | 4.8 |
| Professional school degree | 322 | 2.4 |
| Doctorate degree | 79 | 0.6 |
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