
Sumner township
- County:
- Spink County
- County Seat:
- No
- Area (mi²):
- 36.091
- State:
- South Dakota
Sumner township is located in Spink County, South Dakota. Sumner township has a 2025 population of 11. Sumner township is currently declining at a rate of -8.33% annually and its population has decreased by -21.43% since the most recent census, which recorded a population of 14 in 2020.
The average household income in Sumner township is $252,300 with a poverty rate of 0%. The median age in Sumner township is 60.5 years: 65.5 years for males, and 58.5 years for females.