| Place Name | Union (Pierce County) |
| Place Type | Town |
| ZIP Code(s) | 54721 54750 54761 |
| County | Pierce County |
| Area Code(s) | 535,715 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 649 |
| Majority Ethnicity | White 99.69% |
| Metro/Micro Stats Area | Minneapolis-St. Paul-Bloomington, MN-WI |
| US Congressional District(s) | Wisconsin 3rd |
| State Assembly Districts | 93 |
| State Senate Districts | 31 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 99.69% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0.15% |
| Hawaiin/Pacific Islander | 0.15% |