| Place Name | Walnut Township (Palo Alto County) |
| Place Type | Township |
| ZIP Code(s) | 50536 51342 51358 |
| County | Palo Alto County |
| Area Code(s) | 712 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 1,172 |
| Majority Ethnicity | White 87.78% |
| US Congressional District(s) | Iowa 4th |
| State House Districts | 2 |
| State Senate Districts | 1 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 87.78% |
| African American | 11.03% |
| Hispanic | 0.37% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.83% |