This was 5 percent lower than the state average of 41.9 percent. In 2020 the total municipality population reached 146.
91.3 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 | 9 | 8.7 |
| Regular high school diploma | 37 | 35.9 |
| GED or alternative credential | 2 | 1.9 |
| Some college, less than 1 year | 7 | 6.8 |
| Some college, 1 or more years, no degree | 10 | 9.7 |
| Associate's degree | 16 | 15.5 |
| Bachelor's degree | 16 | 15.5 |
| Master's degree | 6 | 5.8 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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