Prairie township
- County:
- Union County
- County Seat:
- No
- Area (mi²):
- 34.665
- State:
- South Dakota
Prairie township is located in Union County, South Dakota. Prairie township has a 2026 population of 254. Prairie township is currently growing at a rate of 2.01% annually and its population has increased by 8.09% since the most recent census, which recorded a population of 235 in 2020.
The median age in Prairie township is 63.3 years: 41.4 years for males, and 65.3 years for females. For every 100 females there are 297.4 males.