In which county is ZIP code 94027 located?

ZIP 94027 is listed under San Mateo, CA.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 94027: Atherton, CA

ZIP: 94027

County: San Mateo

Coordinates: 37.45630, -122.20020

ZIP Type: Standard

Time Zone: Pacific Time (PT)

Get a reliable snapshot of the Atherton, CA postal area 94027. This page summarizes county, coordinates, and local facts to help with services and location research.

Primary City	Atherton
ZIP Code	94027
County	San Mateo
State	CA
Latitude / Longitude	37.45630, -122.20020
ZIP Type	Standard
Time Zone	Pacific Time (PT)
Data Updated	2026-01-08

Maps & Useful Links

Open in Maps: Google Maps · OpenStreetMap

These links show the approximate center point for ZIP 94027 (not an exact boundary).

Geographic & Administrative Context

The geographic center of ZIP code 94027 is approximately 37.45630 (latitude) and -122.20020 (longitude). This location sits within San Mateo, contributing to regional planning across CA.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 94027 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 Atherton within CA.

Frequently Asked Questions

What is the primary city for ZIP code 94027?

The primary city for this ZIP code is Atherton, located in CA.

In which county is 94027 located?

ZIP code 94027 is situated within San Mateo, CA.

What are the coordinates for 94027?

The approximate center point is 37.45630 (Latitude) and -122.20020 (Longitude).

Is ZIP code 94027 active?

This page lists ZIP 94027 as Listed based on the latest refresh date shown above.

Does ZIP 94027 cover multiple areas?

Yes. Many ZIP codes cover multiple neighborhoods or nearby areas. For exact boundaries, use official mapping tools.

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