This was 19.9 percent lower than the state average of 38 percent. In 2020 the total municipality population reached 555.
91.6 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Union Star for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 25 | 8.4 |
| Regular high school diploma | 152 | 50.8 |
| GED or alternative credential | 27 | 9 |
| Some college, less than 1 year | 15 | 5 |
| Some college, 1 or more years, no degree | 26 | 8.7 |
| Associate's degree | 19 | 6.4 |
| Bachelor's degree | 29 | 9.7 |
| Master's degree | 3 | 1 |
| Professional school degree | 3 | 1 |
| Doctorate degree | 0 | 0 |
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