This was 4.2 percent lower than the state average of 40.2 percent. In 2020 the total municipality population reached 21,976.
89.3 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 | 1,481 | 10.7 |
| Regular high school diploma | 3,074 | 22.3 |
| GED or alternative credential | 508 | 3.7 |
| Some college, less than 1 year | 1,043 | 7.6 |
| Some college, 1 or more years, no degree | 2,714 | 19.7 |
| Associate's degree | 1,588 | 11.5 |
| Bachelor's degree | 2,125 | 15.4 |
| Master's degree | 1,191 | 8.6 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 58 | 0.4 |
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