ZIP Code 91003 is located in Altadena California. 91003 is entirely within Los Angeles County. Regionally, 91003 is located in Metro Los Angeles. Data Updated September 15, 2024
| ZIP Code Name | Altadena |
| Primary County | Los Angeles County |
| ZIP Code Type | PO Box |
| Current Time | PDT |
| Coordinates | 34.18498993,-118.13156128 |
| Adjacent ZIP Codes | |
| Region | Metro Los Angeles |
| Metropolitan/Micropolitan Stat Area | Los Angeles-Long Beach-Anaheim, CA |
| Time Zone | Pacific Daylight Time |
| IANA Timezone | America/Los_Angeles |