| Place Name | Walnut Township (Adair County) |
| Place Type | Township |
| ZIP Code(s) | 50002 50048 |
| County | Adair County |
| Area Code(s) | 641 |
| Timezone | Central Standard Time (CST) |
| Population (2021) | 224 |
| Majority Ethnicity | White 94.4% |
| US Congressional District(s) | Iowa 3rd |
| State House Districts | 20 |
| State Senate Districts | 10 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 94.4% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 5.6% |