St. Mary township is located in McLean County, North Dakota. St. Mary township has a 2026 population of 204. St. Mary township is currently growing at a rate of 0.99% annually and its population has increased by 2.51% since the most recent census, which recorded a population of 199 in 2020.
The median age in St. Mary township is 50.5 years: 49.9 years for males, and 50.6 years for females. For every 100 females there are 129.1 males.
Data after 2023 is projected based on recent change
The racial composition of St. Mary township includes 79.56% White, 15.47% other race, and smaller percentages for and multiracial populations.
White (79.56%)
Other race (15.47%)
Two or more races (4.97%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 288 | 79.56% |
| Other race | 56 | 15.47% |
| Two or more races | 18 | 4.97% |
Married
Widowed
Divorced
Separated
Never Married