Grand River township
- County:
- Decatur County
- County Seat:
- No
- Area (mi²):
- 35.651
- State:
- Iowa
Grand River township is located in Decatur County, Iowa. Grand River township has a 2025 population of 22. Grand River 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 0 in 2020.
The median age in Grand River township is 59.7 years: 0 years for males, and 0 years for females.