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ZIP Code Database - Facts & Stats

Data Last Updated: May 1, 2023

ZIP Codes for City of Altadena, CA

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Area Code(s):626, 323
Timezone(s):Pacific (GMT -08:00)
City Population:42,777 (More Details)
CBSA:Los Angeles-Long Beach-Anaheim, CA
Congressional District(s):28
Land Area:4,058 square miles (county)
Water Area:693 square miles (county)

2 ZIP Codes

Altadena, CA ZIP Code Boundaries

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Altadena, CA Covers 2 ZIP Codes

ZIP CodeTypePopulation% of PopulationAliases
91003P.O. Box00.00%

Altadena, CA Demographic Information *

Total population**42,777
Male population20,623
Female population22,154
Median age (years)41.8
White Population22,569
Black Population10,136
Indian Population300
Asian Population2,307
Hawaiian Population71
Hispanic Population11,502
Median age (Male)40.3
Median age (Female)43.4
Total households15,212
Family households (families)10,708
Average household size2.78
Average family size3.26
Total housing units15,947
* Demographic data is based on 2010 Census for the City of ALTADENA.
** City and ZIP Code Population will not be equal due to differences in their geographies.


  1. U.S. Postal Service [Last Updated: 2/1/2023],
  2. Internal Data Creation [Last Updated: 2/1/2023],
  3. U.S. Geological Survey [Updated as needed],
  4. U.S. Census [Updated Yearly],
  5. U.S. Census 2010 [Decennial] [Last Updated: 1/1/2010],