This was 11.5 percent lower than the state average of 41.1 percent. In 2020 the total municipality population reached 412.
93.1 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Union for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 23 | 6.9 |
| Regular high school diploma | 110 | 33.2 |
| GED or alternative credential | 4 | 1.2 |
| Some college, less than 1 year | 28 | 8.5 |
| Some college, 1 or more years, no degree | 68 | 20.5 |
| Associate's degree | 34 | 10.3 |
| Bachelor's degree | 40 | 12.1 |
| Master's degree | 23 | 6.9 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 1 | 0.3 |
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