Castaic, California Zip Codes
📍 Castaic is in Los Angeles County, California with 2 zip codes; the most populous is 91384.
Castaic is a USPS city name in Los Angeles County, California with a Census population of approximately 27,652 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 Castaic 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 Castaic Zip Codes
Castaic at a Glance
Castaic 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 27,652 residents, the largest being 91384 with 27,652 people.
The median ZIP in Castaic has a household income of $127,416 and a home value of $645,600, a price-to-income ratio of 5.1, below the 6.7 California ZIP median. Median rent across these ZIPs is $1,788 a month.
85% of households in the typical Castaic ZIP own their home (statewide ZIP median 64%). 32% of adults hold a bachelor's degree, in line with the 31% statewide median. The median poverty rate is 4.1%, far below the 10.8% statewide ZIP median. Overall density is about 267 residents per square mile across 104 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.
Castaic Zip Code Map
Interactive map of Castaic, California zip codes. Click any marker for details.