This was 4.8 percent lower than the state average of 33 percent. In 2020 the total municipality population reached 208.
88.3 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Marietta for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 19 | 11.7 |
| Regular high school diploma | 37 | 22.7 |
| GED or alternative credential | 13 | 8 |
| Some college, less than 1 year | 22 | 13.5 |
| Some college, 1 or more years, no degree | 26 | 16 |
| Associate's degree | 13 | 8 |
| Bachelor's degree | 21 | 12.9 |
| Master's degree | 12 | 7.4 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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