This was 14.9 percent lower than the state average of 41.8 percent. In 2020 the total municipality population reached 775.
91 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Arena for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 49 | 9 |
| Regular high school diploma | 186 | 34.3 |
| GED or alternative credential | 22 | 4.1 |
| Some college, less than 1 year | 51 | 9.4 |
| Some college, 1 or more years, no degree | 89 | 16.4 |
| Associate's degree | 73 | 13.4 |
| Bachelor's degree | 47 | 8.7 |
| Master's degree | 21 | 3.9 |
| Professional school degree | 5 | 0.9 |
| Doctorate degree | 0 | 0 |
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