| ZIP Code | 91003 |
| ZIP Code Name | Altadena |
| Primary County | Los Angeles County |
| ZIP Code Type | PO Box |
| Current Time | PDT |
91003 is a United States ZIP Code located in Altadena California. Portions of 91003 are also in . 91003 is entirely within Los Angeles County. 91003 is within Metro Los Angeles.
The current unemployment level in 91003 is 4.3%.| Coordinates | 34.18498993,-118.13156128 |
| Adjacent ZIP Codes | |
| Cities/Towns in 91003 | |
| Region | Metro Los Angeles |
| Metropolitan/Micropolitan Stat Area | Los Angeles-Long Beach-Anaheim, CA |
| Time Zone | Pacific Daylight Time |
| IANA Timezone | America/Los_Angeles |
| US Congressional Districts in 91003 | |
| California State Senate Districts in 91003 | |
| California State Assembly Districts in 91003 |
| School Districts in 91003 |