Castro Valley, CA Area Codes
Castro Valley is served by area codes 341 and 510. It is in California, Alameda County. About 59,361 people live in its 2 ZIP codes.
| Field | Value |
|---|---|
| Area code(s) | 341, 510 |
| State / province | California |
| County | Alameda County |
| Population | 59,361 |
| ZIP codes | 2 |
| Time zone | Pacific |
| Coordinates | 37.7256, -122.0554 |
What area code is Castro Valley in?
ZIP codes in the code footprint
Nearby towns and their area codes
Hayward 341, 510San Lorenzo 341, 510San Leandro 341, 510Moraga 925San Ramon 925Dublin 925Danville 925Alamo 925
How to dial
Dial 341 + 7 digits for a number in Castro Valley, or +1 341 ... from abroad. Ten-digit dialling is required everywhere in the North American Numbering Plan.