| Place Name | Union Township (Clark County) |
| Place Type | Township |
| ZIP Code(s) | 63445 63466 63474 |
| County | Clark County |
| Area Code(s) | 573,660 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 279 |
| Majority Ethnicity | White 100% |
| Metro/Micro Stats Area | Fort Madison-Keokuk, IA-IL-MO |
| US Congressional District(s) | Missouri 6th |
| State House Districts | 4 |
| State Senate Districts | 18 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |