Sully township
- County:
- Tripp County
- County Seat:
- No
- Area (mi²):
- 35.639
- State:
- South Dakota
Sully township is located in Tripp County, South Dakota. Sully township has a 2025 population of 27. Sully township is currently declining at a rate of 0% annually and its population has decreased by 0% since the most recent census, which recorded a population of 27 in 2020.
The median age in Sully township is 59.6 years: 59.9 years for males, and 20.5 years for females.