In which county is ZIP code 94540 located?

ZIP 94540 is listed under Alameda County, CA.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 94540: Hayward, CA

ZIP: 94540

County: Alameda County

Coordinates: 37.68020, -121.92150

ZIP Type: Standard

Time Zone: Pacific Time (PT)

Get a reliable snapshot of the Hayward, CA postal area 94540. This page summarizes county, coordinates, and local facts to help with services and location research.

Primary City	Hayward
ZIP Code	94540
County	Alameda County
State	CA
Latitude / Longitude	37.68020, -121.92150
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 94540 (not an exact boundary).

Geographic & Administrative Context

For mapping and verification, 94540 is commonly represented around 37.68020, -121.92150. These coordinates help identify the general area within Alameda County, CA.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 94540 for mail delivery and general location reference in Alameda County, CA.

This ZIP may extend beyond the city core into nearby communities within Alameda County.

Related ZIP Codes (Nearby)

Explore other postal codes near Hayward within CA.

Frequently Asked Questions

What is the primary city for ZIP code 94540?

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

In which county is 94540 located?

ZIP code 94540 is situated within Alameda County, CA.

What are the coordinates for 94540?

The approximate center point is 37.68020 (Latitude) and -121.92150 (Longitude).

Is ZIP code 94540 active?

This page lists ZIP 94540 as Listed based on the latest refresh date shown above.

Does ZIP 94540 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