Flandreau
- County:
- Moody County
- County Seat:
- No
- Area (mi²):
- 1.859
- State:
- South Dakota
Flandreau is a city located in Moody County, South Dakota. Flandreau has a 2026 population of 2,372. Flandreau is currently growing at a rate of 0.68% annually but its population has decreased by -0.08% since the most recent census, which recorded a population of 2,374 in 2020.