San Carlos, California Zip Codes
📍 San Carlos is in San Mateo County, California with 2 zip codes; the most populous is 94070.
San Carlos is a USPS city name in San Mateo County, California with a Census population of approximately 31,312 across its ZIP codes. San Mateo County as a whole has 57 ZIP codes in this directory. Below you'll find every zip code serving San Carlos 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 Carlos Zip Codes
San Carlos at a Glance
San Carlos 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 31,312 residents, the largest being 94070 with 31,312 people.
The median ZIP in San Carlos has a household income of $220,323 and a home value of more than $2,000,000, a price-to-income ratio of at least 9.1, above the 6.7 California ZIP median. Median rent across these ZIPs is $2,759 a month.
70% of households in the typical San Carlos ZIP own their home (statewide ZIP median 64%). 67% of adults hold a bachelor's degree, far above the 31% statewide median. The median poverty rate is 3.0%, far below the 10.8% statewide ZIP median. Overall density is about 5,133 residents per square mile across 6 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 Carlos Zip Code Map
Interactive map of San Carlos, California zip codes. Click any marker for details.