San Marino, California Zip Codes
📍 San Marino is in Los Angeles County, California with 2 zip codes; the most populous is 91108.
San Marino is a USPS city name in Los Angeles County, California with a Census population of approximately 12,559 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 San Marino 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 San Marino Zip Codes
San Marino at a Glance
San Marino 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 12,559 residents, the largest being 91108 with 12,559 people.
The median ZIP in San Marino has a household income of $173,312 and a home value of more than $2,000,000, a price-to-income ratio of at least 11.5, far above the 6.7 California ZIP median. Median rent across these ZIPs is $3,501 a month.
82% of households in the typical San Marino ZIP own their home (statewide ZIP median 64%). 80% of adults hold a bachelor's degree, far above the 31% statewide median. The median poverty rate is 9.1%, below the 10.8% statewide ZIP median. Overall density is about 3,305 residents per square mile across 4 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.
San Marino Zip Code Map
Interactive map of San Marino, California zip codes. Click any marker for details.