River Sioux is an unincorporated community and census-designated place in Harrison County, Iowa, United States.

River Sioux was platted in 1868 when the railroad was extended to that point.

[5] River Sioux is zoned to the West Harrison Community School District.

[6] As of the census of 2020,[8] there were 42 people, 17 households, and 7 families residing in the community.

This article about the geography of Harrison County, Iowa is a stub.