Postal reference / United States
94540Hayward, California
ZIP code 94540 is a United States postal code for Hayward, California. Its county association is Alameda County. The map reference point is at 37.6802, -121.9215.
- State / territory
- California
- Recorded place name
- Hayward
- County association
- Alameda
- Estimated coordinate
- 37.6802, -121.9215
View on OpenStreetMap - ZIP prefix
- 945 · 93 ZIP codes share it
- Data source
- GeoNames postal reference, snapshot September 26, 2026
GeoNames reference data. County associations may not include every intersecting county, place names are postal names rather than legal boundaries, and coordinates are approximate. This is not address validation.
Need the last four digits?
ZIP+4 depends on the full delivery address. A five-digit code alone cannot determine its extension.
Find ZIP+4Explore California
Browse the other 2,592 ZIP codes recorded for California, sorted by code with place and county.
California directoryOther ZIP codes in Hayward, CA
Hayward has 7 ZIP codes in the reference dataset.
Nearby ZIP code reference points
| ZIP code | Place | State | County association | Miles |
|---|---|---|---|---|
| 94537 | Fremont | CA | Alameda | 0.0 |
| 94557 | Hayward | CA | Alameda | 0.0 |
| 94588 | Pleasanton | CA | Alameda | 1.5 |
| 94568 | Dublin | CA | Alameda | 2.5 |
| 94566 | Pleasanton | CA | Alameda | 2.7 |
| 94586 | Sunol | CA | Alameda | 5.0 |
| 94583 | San Ramon | CA | Contra Costa | 5.5 |
| 94582 | San Ramon | CA | Contra Costa | 5.8 |
Straight-line distance between reference points. Nearby points do not prove that ZIP areas touch.
Verify a mailing address
For mailing, confirm the complete street or PO Box address with USPS. A place record does not confirm delivery eligibility or the ZIP+4 extension.
Open USPS address lookup