Altadena, California Zip Codes
📍 Altadena is in Los Angeles County, California with 2 zip codes; the most populous is 91001.
Altadena is a USPS city name in Los Angeles County, California with a Census population of approximately 36,420 across its ZIP codes. Los Angeles County as a whole has 538 ZIP codes in this directory. Below you'll find every zip code serving Altadena with population, income and home value, a map, and the city's affordability profile.
Population and demographic data sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code routing data sourced from the United States Postal Service (USPS).
All Altadena Zip Codes
Altadena at a Glance
Altadena has 2 ZIP codes in this directory: 1 standard delivery ZIP and 1 PO Box or unique ZIP that carries no resident population in Census data. The 1 ZIP with published Census housing data cover 36,420 residents, the largest being 91001 with 36,420 people.
The median ZIP in Altadena has a household income of $129,030 and a home value of $1,002,600, a price-to-income ratio of 7.8, above the 6.7 California ZIP median. Median rent across these ZIPs is $2,160 a month.
79% of households in the typical Altadena ZIP own their home (statewide ZIP median 64%). 52% of adults hold a bachelor's degree, far above the 31% statewide median. The median poverty rate is 7.1%, below the 10.8% statewide ZIP median. Overall density is about 4,388 residents per square mile across 8 square miles of ZIP land area.
Medians are taken across the ZIP codes listed below (each ZIP weighted equally); PO Box and no-data ZIPs are excluded. Definitions on the methodology page; statewide comparisons in the 2026 California ZIP Code Affordability Report.
Altadena Zip Code Map
Interactive map of Altadena, California zip codes. Click any marker for details.