St. Charles is a CDP located in Gregory County, South Dakota. St. Charles has a 2026 population of 14. St. Charles is currently growing at a rate of 7.69% annually and its population has decreased by 0% since the most recent census, which recorded a population of 0 in 2020.
The median age in St. Charles is 67 years: 0 years for males, and 0 years for females. For every 100 females there are 100.0 males.
Data after 2023 is projected based on recent change
Overall: 67 years
Female: 0 years
Male: 0 years
There are 6 adults, (5 of whom are seniors) in St. Charles.
Female: 3 (50%)
Male: 3 (50%)
The racial composition of St. Charles includes 100% White, and smaller percentages for and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 6 | 100% |