| Place Name | Walnut Township (Madison County) |
| Place Type | Township |
| ZIP Code(s) | 50149 50222 50257 50273 |
| County | Madison County |
| Area Code(s) | 641,515 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 323 |
| Majority Ethnicity | White 99.69% |
| Metro/Micro Stats Area | Des Moines-West Des Moines, IA |
| US Congressional District(s) | Iowa 3rd |
| State House Districts | 25 |
| State Senate Districts | 13 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 99.69% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.31% |