| Place Name | Altadena |
| Place Type | Census Designated Place |
| ZIP Code(s) | 91001 |
| GEOID | 0601290 |
| County | Los Angeles County |
| Area Code(s) | 626 |
| Timezone | Pacific Standard Time (PST) |
| Population (2021) | 43,384 |
| Population Growth Rate (2010-19) | 0.16% |
| Majority Ethnicity | White 46.8% |
| Metro/Micro Stats Area | Los Angeles-Long Beach-Anaheim, CA |
| US Congressional District(s) | California 27th |
| State Assembly Districts | 41 |
| State Senate Districts | 25 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 46.8% |
| African American | 19.14% |
| Hispanic | 0.91% |
| Asian | 5.14% |
| Native American | 0.08% |
| Hawaiin/Pacific Islander | 27.93% |