This was 17.3 percent lower than the state average of 46.3 percent. In 2020 the total municipality population reached 1,055.
92.5 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Marathon for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 47 | 7.5 |
| Regular high school diploma | 249 | 39.5 |
| GED or alternative credential | 26 | 4.1 |
| Some college, less than 1 year | 65 | 10.3 |
| Some college, 1 or more years, no degree | 60 | 9.5 |
| Associate's degree | 108 | 17.1 |
| Bachelor's degree | 28 | 4.4 |
| Master's degree | 35 | 5.6 |
| Professional school degree | 4 | 0.6 |
| Doctorate degree | 8 | 1.3 |
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