91003 ZIP Code — Altadena, CA
Los Angeles County, California
ZIP code 91003 is located in Altadena, California, within Los Angeles County. It covers approximately 0.00 square miles and serves a population of 0 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 626.
0
population
0.00
sq mi land
Standard
ZIP type
Pacific (PT)
timezone
91003 ZIP code map
Cities in ZIP code 91003
Below are the cities the US Postal Service accepts for ZIP code 91003. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Altadena | Acceptable |
Demographics
updated 06/2026
| Population | |
|---|---|
| Total population | 0 |
| Population density | 0 / sq mi |
| State FIPS | 06 |
| County FIPS | 037 |
| Geography | |
|---|---|
| Land area | 0.00 sq mi |
| Water area | 0.00 sq mi |
| Latitude | 34.1897 |
| Longitude | -118.1303 |
| Timezone | Pacific (PT) |
| Area code | 626 |