This was 13.1 percent lower than the state average of 35.7 percent. In 2020 the total municipality population reached 10,426.
84.2 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 | 1,105 | 15.8 |
| Regular high school diploma | 2,226 | 31.9 |
| GED or alternative credential | 716 | 10.2 |
| Some college, less than 1 year | 593 | 8.5 |
| Some college, 1 or more years, no degree | 770 | 11 |
| Associate's degree | 384 | 5.5 |
| Bachelor's degree | 691 | 9.9 |
| Master's degree | 383 | 5.5 |
| Professional school degree | 118 | 1.7 |
| Doctorate degree | 0 | 0 |
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