This was 25.9 percent lower than the state average of 40.5 percent. In 2020 the total municipality population reached 1,164.
69.2 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 | 268 | 30.8 |
| Regular high school diploma | 281 | 32.3 |
| GED or alternative credential | 74 | 8.5 |
| Some college, less than 1 year | 52 | 6 |
| Some college, 1 or more years, no degree | 67 | 7.7 |
| Associate's degree | 36 | 4.1 |
| Bachelor's degree | 75 | 8.6 |
| Master's degree | 16 | 1.8 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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