La Roche
- County:
- Charles Mix County
- County Seat:
- No
- Area (mi²):
- 60.431
- State:
- South Dakota
La Roche is located in Charles Mix County, South Dakota. La Roche has a 2025 population of 371 . La Roche is currently growing at a rate of 1.09% annually and its population has increased by 3.06% since the most recent census, which recorded a population of 360 in 2020.