| Place Name | Union Township (Calhoun County) |
| Place Type | Township |
| ZIP Code(s) | 50579 51449 51453 |
| County | Calhoun County |
| Area Code(s) | 712 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 356 |
| Majority Ethnicity | White 96.33% |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 10 |
| State Senate Districts | 5 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 96.33% |
| African American | 0% |
| Hispanic | 2.54% |
| Asian | 1.13% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |