| Place Name | Union Township (Marion County) |
| Place Type | Township |
| County | Marion County |
| Area Code(s) | 573 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 998 |
| Majority Ethnicity | White 98.99% |
| Metro/Micro Stats Area | Hannibal, MO |
| US Congressional District(s) | Missouri 6th |
| State House Districts | 5 |
| State Senate Districts | 18 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 98.99% |
| African American | 0% |
| Hispanic | 0.6% |
| Asian | 0.4% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |