| Place Name | Union Township (Woodbury County) |
| Place Type | Township |
| ZIP Code(s) | 51016 51048 |
| County | Woodbury County |
| Area Code(s) | 712 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 606 |
| Majority Ethnicity | White 97.28% |
| Metro/Micro Stats Area | Sioux City, IA-NE-SD |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 5 |
| State Senate Districts | 3 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 97.28% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 1.19% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 1.53% |