Greenfield township
- County:
- Brown County
- County Seat:
- No
- Area (mi²):
- 32.595
- State:
- South Dakota
Greenfield township is located in Brown County, South Dakota. Greenfield township has a 2025 population of 37. Greenfield township is currently growing at a rate of 2.78% annually and its population has increased by 5.71% since the most recent census, which recorded a population of 35 in 2020.
The median age in Greenfield township is 47.3 years: 0 years for males, and 0 years for females.