| Official Name: | Grand River Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Decatur |
| Area Total Km2: | 92.61 |
| Area Land Km2: | 92.43 |
| Area Water Km2: | 0.18 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 35.76 |
| Area Land Sq Mi: | 35.69 |
| Area Water Sq Mi: | 0.07 |
| Area Water Percent: | 0.19 |
| Population As Of: | 2000 |
| Population Total: | 112 |
| Population Density Km2: | 1.2 |
| Population Density Sq Mi: | 3.1 |
| Elevation M: | 316 |
| Elevation Ft: | 1037 |
| Coordinates: | 40.7689°N -93.9664°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0467924 |
Grand River Township is a township in Decatur County, Iowa, United States. As of the 2000 census, its population was 112. The African American entrepreneur and publisher of the Iowa Bystander John Lay Thompson was born on his family's farm in the township in 1869.[1] [2]
Grand River Township covers an area of 35.76 square miles (92.61 square kilometers); of this, 0.07 square miles (0.18 square kilometers) or 0.19 percent is water. The streams of South Elk Creek and West Elk Creek run through this township.
The township contains three cemeteries: Millsap, Oak Hill and Old Funk.[3]