ZIP Code 94540 — Hayward, California
📍 ZIP code 94540 is in Hayward, Alameda County, California.
ZIP code 94540 is a PO Box ZIP code assigned by the U.S. Postal Service in Hayward, Alameda County, California. It serves post office boxes at a Hayward post office rather than street addresses, which is why the Census Bureau reports no resident population, income or housing figures for it. Mail addressed to 94540 is handled in the Pacific Time Zone and the local area code is 510. The demographic profile of the surrounding community is on the standard delivery ZIP pages for Hayward listed below.
ZIP Code 94540 Map
Coordinates: 37.6802°N, 121.9215°W
Why there are no demographics for 94540
The Census Bureau publishes demographics for ZIP Code Tabulation Areas (ZCTAs), which are built from populated census blocks. A PO Box ZIP like 94540 has no delivery territory of its own, so there is no ZCTA and no population, income, housing or education estimate to report. This is normal: Alameda County and the rest of California have hundreds of PO Box and unique ZIPs of this kind.
For the community around Hayward, use the delivery ZIPs that do carry Census data:
How ZIPs and ZCTAs differ is explained on the methodology page.
Nearby Zip Codes
Cities & Places Served
ZIP code 94540 primarily serves Hayward in Alameda County, California.