| Place Name | Walnut |
| Place Type | City |
| ZIP Code(s) | 91789 |
| County | Los Angeles County |
| Area Code(s) | 909,626 |
| Timezone | Pacific Daylight Time (PDT) |
| Population (2022) | 29,431 |
| Population Growth Rate (2010-19) | -2.54% |
| Majority Ethnicity | Asian 62.55% |
| Metro/Micro Stats Area | Los Angeles-Long Beach-Anaheim, CA |
| US Congressional District(s) | California 39th |
| State Assembly Districts | 55 |
| State Senate Districts | 29 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 15.72% |
| African American | 2.97% |
| Hispanic | 0.55% |
| Asian | 62.55% |
| Native American | 0.57% |
| Hawaiin/Pacific Islander | 17.65% |