Marion
- County:
- Turner County
- County Seat:
- No
- Area (mi²):
- 35.012
- State:
- South Dakota
Marion is located in Turner County, South Dakota. Marion has a 2025 population of 188 . Marion is currently growing at a rate of 1.08% annually and its population has increased by 5.03% since the most recent census, which recorded a population of 179 in 2020.
The median age in Marion is 53.2 years: 43.9 years for males, and 54.5 years for females. For every 100 females there are 250.0 males.