
Marion
- County:
- Turner County
- County Seat:
- No
- Area (mi²):
- 0.868
- State:
- South Dakota
Marion is a city located in Turner County, South Dakota. Marion has a 2025 population of 894. Marion is currently growing at a rate of 1.13% annually and its population has increased by 6.05% since the most recent census, which recorded a population of 843 in 2020.
The average household income in Marion is $84,553 with a poverty rate of 8.18%. The median age in Marion is 51.5 years: 43.4 years for males, and 55.5 years for females.