San Mateo, California Zip Codes
📍 San Mateo is in San Mateo County, California with 10 zip codes; the most populous is 94403.
San Mateo is a USPS city name in San Mateo County, California with a Census population of approximately 141,797 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 Mateo 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 Mateo Zip Codes
| ZIP Code | City | Details |
|---|---|---|
| 94401 | San Mateo | View → |
| 94402 | San Mateo | View → |
| 94403 | San Mateo | View → |
| 94404 | San Mateo | View → |
| 94405 | San Mateo | View → |
| 94406 | San Mateo | View → |
| 94407 | San Mateo | View → |
| 94408 | San Mateo | View → |
| 94409 | San Mateo | View → |
| 94497 | San Mateo | View → |
San Mateo at a Glance
San Mateo has 10 ZIP codes in this directory: 4 standard delivery ZIPs and 6 PO Box or unique ZIPs that carry no resident population in Census data. The 4 ZIPs with published Census housing data cover 141,797 residents, the largest being 94403 with 43,858 people.
The median ZIP in San Mateo has a household income of $176,956 and a home value of $1,636,800, a price-to-income ratio of 9.6, above the 6.7 California ZIP median. Affordability ranges from 94404 at a ratio of 8.7 to 94402, where the median home is above the $2 million Census ceiling. The highest median income is in 94402 at $184,453. Median rent across these ZIPs is $3,241 a month.
53% of households in the typical San Mateo ZIP own their home (statewide ZIP median 64%). 65% of adults hold a bachelor's degree, far above the 31% statewide median. The median poverty rate is 5.8%, below the 10.8% statewide ZIP median. Overall density is about 7,834 residents per square mile across 18 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 Mateo Zip Code Map
Interactive map of San Mateo, California zip codes. Click any marker for details.