This was 18.6 percent lower than the state average of 43.4 percent. In 2020 the total municipality population reached 1,841.
88.4 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 | 161 | 11.6 |
| Regular high school diploma | 327 | 23.6 |
| GED or alternative credential | 89 | 6.4 |
| Some college, less than 1 year | 108 | 7.8 |
| Some college, 1 or more years, no degree | 357 | 25.8 |
| Associate's degree | 160 | 11.6 |
| Bachelor's degree | 144 | 10.4 |
| Master's degree | 15 | 1.1 |
| Professional school degree | 13 | 0.9 |
| Doctorate degree | 11 | 0.8 |
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