Castro valley Area Code
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Castro valley, CA area code
Castro valley, CA is served by area code 510. This area code was initially assigned on 25-APR-90 and has been in continuous service since 02-SEP-91, supporting the city's growing communication needs over the years.
The area code 510 is part of an overlay complex (341/510), which serves the same geographic region. This means that multiple area codes are used in the same area to accommodate the increasing demand for phone numbers.
| City Name | Castro valley, CA |
| Area Code | 510 |
| Overlay Complex | 341/510 |
| State | California |
| Country | United State |
| Time Zone | Pacific Standard Time (PST) |
| Code Type | General Purpose Code |
| In Service | Yes |
| Assignment Date | 25-APR-90 |
| In Service Date | 02-SEP-91 |
