| Place Name | Union Township (Hardin County) |
| Place Type | Township |
| ZIP Code(s) | 50258 50259 50269 50627 |
| County | Hardin County |
| Area Code(s) | 641 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 974 |
| Majority Ethnicity | White 98.55% |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 49 |
| State Senate Districts | 25 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 98.55% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 1.04% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.42% |