Fairfax, California Zip Codes
📍 Fairfax is in Marin County, California with 2 zip codes; the most populous is 94930.
Fairfax is a USPS city name in Marin County, California with a Census population of approximately 8,748 across its ZIP codes. Marin County as a whole has 42 ZIP codes in this directory. Below you'll find every zip code serving Fairfax 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 Fairfax Zip Codes
Fairfax at a Glance
Fairfax 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 8,748 residents, the largest being 94930 with 8,748 people.
The median ZIP in Fairfax has a household income of $129,839 and a home value of $1,056,100, a price-to-income ratio of 8.1, above the 6.7 California ZIP median. Median rent across these ZIPs is $2,301 a month.
66% of households in the typical Fairfax ZIP own their home (statewide ZIP median 64%). 68% of adults hold a bachelor's degree, far above the 31% statewide median. The median poverty rate is 8.8%, below the 10.8% statewide ZIP median. Overall density is about 616 residents per square mile across 14 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.
Fairfax Zip Code Map
Interactive map of Fairfax, California zip codes. Click any marker for details.