| Place Name | St. Clair Township (Monona County) |
| Place Type | Township |
| ZIP Code(s) | 51034 51060 51572 |
| County | Monona County |
| Area Code(s) | 712 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 456 |
| Majority Ethnicity | White 99.13% |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 17 |
| State Senate Districts | 9 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 99.13% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.87% |