| Place Name | Union Township (Washington County) |
| Place Type | Township |
| ZIP Code(s) | 63626 63630 63660 63664 |
| County | Washington County |
| Area Code(s) | 573,636 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 2,079 |
| Majority Ethnicity | White 98.48% |
| US Congressional District(s) | Missouri 8th |
| State House Districts | 118 |
| State Senate Districts | 3 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 98.48% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 1.52% |