| Place Name | St. Marys Township |
| Place Type | Township |
| ZIP Code(s) | 51503 51561 68005 |
| County | Mills County |
| Area Code(s) | 712 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 97 |
| Majority Ethnicity | White 100% |
| Metro/Micro Stats Area | Omaha-Council Bluffs, NE-IA |
| US Congressional District(s) | Iowa 3rd |
| State House Districts | 23 |
| State Senate Districts | 12 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |