Los Alamos, California Zip Codes
📍 Los Alamos is in Santa Barbara County, California with 1 zip code; the most populous is 93440.
Los Alamos is a USPS city name in Santa Barbara County, California with a Census population of approximately 846 across its ZIP codes. Santa Barbara County as a whole has 41 ZIP codes in this directory. Below you'll find every zip code serving Los Alamos 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 Los Alamos Zip Codes
Los Alamos at a Glance
Los Alamos has 1 ZIP code in this directory: 1 standard delivery ZIP. The 1 ZIP with published Census housing data cover 846 residents, the largest being 93440 with 846 people.
The median ZIP in Los Alamos has a household income of $46,930 and a home value of $639,000, a price-to-income ratio of 13.6, far above the 6.7 California ZIP median. Median rent across these ZIPs is $536 a month.
81% of households in the typical Los Alamos ZIP own their home (statewide ZIP median 64%). 20% of adults hold a bachelor's degree, below the 31% statewide median. The median poverty rate is 4.6%, far below the 10.8% statewide ZIP median. Overall density is about 19 residents per square mile across 44 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.
Los Alamos Zip Code Map
Interactive map of Los Alamos, California zip codes. Click any marker for details.