This was 6.6 percent lower than the state average of 28.9 percent. In 2020 the total municipality population reached 459.
91.3 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 | 36 | 8.7 |
| Regular high school diploma | 160 | 38.7 |
| GED or alternative credential | 24 | 5.8 |
| Some college, less than 1 year | 38 | 9.2 |
| Some college, 1 or more years, no degree | 63 | 15.3 |
| Associate's degree | 20 | 4.8 |
| Bachelor's degree | 21 | 5.1 |
| Master's degree | 47 | 11.4 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 4 | 1 |
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