Find the last 4 digits (ZIP+4) for an address in 91001

ZIP 91001, Altadena, CA is filled in. Just type the street address.

Addresses are checked through our secure proxy. Bot checks use Cloudflare Turnstile. Each device can run 5 live checks per day; repeats of the same address are free.

ZIP Code 91001 – Altadena, CA

Altadena, California · Los Angeles County · Pacific time

ZIP code91001
CityAltadena
StateCalifornia
CountyLos Angeles County
Population35,475
Time zonePacific · local time
ZIP typeStandard (has a Census ZCTA area)
Land area8.26 sq mi
Center (lat, long)34.1945, -118.1383

Area codes in this area

626

These are the area codes that most often serve ZIP 91001 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

91003 Altadena · 0.5 mi91104 Pasadena · 2.2 mi91103 Pasadena · 2.4 mi91012 La Canada Flintridge · 2.9 mi91199 Pasadena · 3.2 mi91102 Pasadena · 3.2 mi91109 Pasadena · 3.2 mi91110 Pasadena · 3.2 mi

About ZIP 91001

ZIP code 91001 is assigned to Altadena, California. It lies in Los Angeles County. Its Census area covers about 8.26 square miles of land. The closest neighboring ZIP is 91003 (Altadena), about 0.5 miles away.

Every address in 91001 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources