Wismer township
- County:
- Marshall County
- County Seat:
- No
- Area (mi²):
- 17.04
- State:
- South Dakota
Wismer township is located in Marshall County, South Dakota. Wismer township has a 2026 population of 34. Wismer township is currently declining at a rate of 0% annually and its population has increased by 6.25% since the most recent census, which recorded a population of 32 in 2020.