ZIP Code 94028: Portola Valley, CA
County: San Mateo
Coordinates: 37.37020, -122.21820
ZIP Type: Standard
Time Zone: Pacific Time (PT)
Get a reliable snapshot of the Portola Valley, CA postal area 94028. This page summarizes county, coordinates, and local facts to help with services and location research.
| Primary City | Portola Valley |
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| ZIP Code | 94028 |
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| County | San Mateo |
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| State | CA |
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| Latitude / Longitude | 37.37020, -122.21820 |
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| ZIP Type | Standard |
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| Time Zone | Pacific Time (PT) |
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| Data Updated | 2026-01-08 |
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Maps & Useful Links
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These links show the approximate center point for ZIP 94028 (not an exact boundary).
Geographic & Administrative Context
For mapping and verification, 94028 is commonly represented around 37.37020, -122.21820. These coordinates help identify the general area within San Mateo, CA.
Local Coverage Notes
ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 94028 for mail delivery and general location reference in
San Mateo,
CA.
This ZIP may extend beyond the city core into nearby communities within San Mateo.
Related ZIP Codes (Nearby)
Explore other postal codes near Portola Valley within CA.
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Frequently Asked Questions
What is the primary city for ZIP code 94028?
The primary city for this ZIP code is Portola Valley, located in CA.
In which county is 94028 located?
ZIP code 94028 is situated within San Mateo, CA.
What are the coordinates for 94028?
The approximate center point is 37.37020 (Latitude) and -122.21820 (Longitude).
Is ZIP code 94028 active?
This page lists ZIP 94028 as Listed based on the latest refresh date shown above.
Does ZIP 94028 cover multiple areas?
Yes. Many ZIP codes cover multiple neighborhoods or nearby areas. For exact boundaries, use official mapping tools.
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Methodology & Data Notes
How we build this page: We generate this page from a structured ZIP dataset and refresh key fields (city, county, and coordinates) during scheduled updates. Coordinates represent an approximate center point, not an official boundary map.
Sources: Public ZIP reference datasets and geographic coordinate references. If you use specific sources (e.g., USPS, Census), list them on your About/Methodology page.
Page updated: 2026-01-08