McKinley is located in Marshall County, South Dakota. McKinley has a 2025 population of 27 . McKinley is currently growing at a rate of 3.85% annually and its population has increased by 8% since the most recent census, which recorded a population of 25 in 2020.
The median age in McKinley is 21.7 years: 21.8 years for males, and 19.9 years for females. For every 100 females there are 127.9 males.
Data after 2023 is projected based on recent change
The racial composition of McKinley includes 75.51% Native American, 24.49% White, and smaller percentages for and multiracial populations.
Native American (75.51%)
White (24.49%)
Race | Population | Percentage (of total) |
|---|---|---|
| Native American | 74 | 75.51% |
| White | 24 | 24.49% |
Married
Widowed
Divorced
Separated
Never Married