South Valley township
- County:
- Rolette County
- County Seat:
- No
- Area (mi²):
- 35.947
- State:
- North Dakota
South Valley township is located in Rolette County, North Dakota. South Valley township has a 2026 population of 32. South Valley township is currently declining at a rate of -3.03% annually and its population has decreased by -5.88% since the most recent census, which recorded a population of 34 in 2020.
The median age in South Valley township is 64.2 years: 0 years for males, and 0 years for females. For every 100 females there are 130.0 males.