ZIP code · San Mateo · California · United States
ZIP code 94403 — San Mateo
ZIP code 94403 serves San Mateo, California.
- Postal code
- 94403Single source Value from one source, not cross-checked.
- City
- San Mateo
- County
- San Mateo FIPS 06081
- State
- California
- Country
- United States
- Coordinates
- 37.5395, -122.2998 — precision precise (locality)
View on OpenStreetMap - Population
- 43,459 (ZCTA, ACS 5-year)
- Population density
- 7,715 / sq mi
- Land area
- 5.6 sq mi (14.6 km²) (ZCTA, ACS 5-year)
- Median household income
- $179,825
- Per-capita income
- $86,629
- Median age
- 38.5
- Households
- 16,372
- Housing units
- 17,682
- Median home value
- $1,725,900
- Median gross rent
- $3,273 / month
- Congressional district
- CA-15 (119th Congress)
- USDA hardiness zone
- 10a (30 to 35 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Los_Angeles (UTC−8 / UTC−7 DST)
- Area code
- 650Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 94403 with another ZIP · ZIPs within 25 miles · distance from 94403
Map of ZIP code 94403
Climate — monthly normals
Warmest month Jul (avg high 81°F), coldest Dec (avg low 40°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 59 | 62 | 65 | 69 | 73 | 79 | 81 | 81 | 79 | 75 | 65 | 59 |
| Avg low °F | 41 | 43 | 45 | 47 | 50 | 54 | 57 | 57 | 54 | 50 | 44 | 40 |
| Precip in | 3.8 | 3.6 | 3.0 | 1.1 | 0.5 | 0.2 | 0.0 | 0.0 | 0.1 | 0.9 | 1.9 | 3.9 |
NOAA 1991–2020 climate normals from the nearest station: REDWOOD CITY (5.5 mi) · NOAA NCEI
Places in ZIP 94403
- 20 schools
- 1 colleges & universities
- 5 hospitals & clinics
- 2 pharmacies
- 8 supermarkets
- 64 restaurants & cafés
- 2 bars & pubs
- 25 parks
- 18 playgrounds
- 6 gyms & sports centres
- 2 libraries
- 2 post offices
- 7 places of worship
- 9 banks
- 8 gas stations
- 9 EV charging stations
- 3 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page