| Place Name | Walnut |
| Place Type | City |
| ZIP Code(s) | 51577 |
| County | Pottawattamie County |
| Area Code(s) | 712 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 767 |
| Population Growth Rate (2010-19) | -4.84% |
| Majority Ethnicity | White 98.1% |
| Metro/Micro Stats Area | Omaha-Council Bluffs, NE-IA |
| US Congressional District(s) | Iowa 3rd |
| State House Districts | 21 |
| State Senate Districts | 11 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 98.1% |
| African American | 1.6% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.29% |