This was 3.1 percent higher than the state average of 34.4 percent. In 2020 the total municipality population reached 106.
89.1 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 | 7 | 10.9 |
| Regular high school diploma | 13 | 20.3 |
| GED or alternative credential | 0 | 0 |
| Some college, less than 1 year | 0 | 0 |
| Some college, 1 or more years, no degree | 20 | 31.2 |
| Associate's degree | 8 | 12.5 |
| Bachelor's degree | 5 | 7.8 |
| Master's degree | 7 | 10.9 |
| Professional school degree | 4 | 6.2 |
| Doctorate degree | 0 | 0 |
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