
St Charles
- County:
- Gregory County
- County Seat:
- No
- Area (mi²):
- 0.197
- State:
- South Dakota
St. Charles is a CDP located in Gregory County, South Dakota. St. Charles has a 2025 population of 9. St. Charles is currently growing at a rate of 12.5% annually and its population has increased by 12.5% since the most recent census, which recorded a population of 8 in 2020.
The average household income in St. Charles is $34,233 with a poverty rate of 18.18%. The median age in St. Charles is 74.3 years: 0 years for males, and 65.8 years for females.