This was 25.3 percent higher than the state average of 33.6 percent. In 2020 the total municipality population reached 5,988.
99.1 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 | 34 | 0.9 |
| Regular high school diploma | 811 | 21 |
| GED or alternative credential | 98 | 2.5 |
| Some college, less than 1 year | 174 | 4.5 |
| Some college, 1 or more years, no degree | 472 | 12.2 |
| Associate's degree | 291 | 7.5 |
| Bachelor's degree | 1,318 | 34.1 |
| Master's degree | 568 | 14.7 |
| Professional school degree | 61 | 1.6 |
| Doctorate degree | 43 | 1.1 |
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