| Place Name | St. Mary Township |
| Place Type | Township |
| ZIP Code(s) | 58540 |
| County | Mclean County |
| Area Code(s) | 701 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 265 |
| Majority Ethnicity | White 77.36% |
| US Congressional District(s) | North Dakota At-Large |
| State House Districts | 8 |
| State Senate Districts | 8 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 77.36% |
| African American | 0% |
| Hispanic | 2.64% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 20% |