
River Sioux
- County:
- Harrison County
- County Seat:
- No
- Area (mi²):
- 0.381
- State:
- Iowa
River Sioux is a CDP located in Harrison County, Iowa. River Sioux has a 2025 population of 6. River Sioux is currently declining at a rate of 0% annually and its population has decreased by -85% since the most recent census, which recorded a population of 40 in 2020.
The average household income in River Sioux is $0 with a poverty rate of 0%. The median age in River Sioux is 0 years: 0 years for males, and 0 years for females.