This was 28.4 percent lower than the state average of 47.4 percent. In 2020 the total municipality population reached 1,434.
71.8 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 | 292 | 28.2 |
| Regular high school diploma | 247 | 23.8 |
| GED or alternative credential | 81 | 7.8 |
| Some college, less than 1 year | 58 | 5.6 |
| Some college, 1 or more years, no degree | 161 | 15.5 |
| Associate's degree | 18 | 1.7 |
| Bachelor's degree | 100 | 9.7 |
| Master's degree | 70 | 6.8 |
| Professional school degree | 9 | 0.9 |
| Doctorate degree | 0 | 0 |
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