| Place Name | Union Township (Franklin County) |
| Place Type | Township |
| County | Franklin County |
| Area Code(s) | 636,573 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 19,659 |
| Majority Ethnicity | White 95.19% |
| Metro/Micro Stats Area | St. Louis, MO-IL |
| US Congressional District(s) | Missouri 3rd |
| State House Districts | 109,119 |
| State Senate Districts | 26 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 95.19% |
| African American | 1.53% |
| Hispanic | 0.02% |
| Asian | 0.84% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 2.42% |