Area Code 510 at a Glance
| Area code | 510 |
| Region | California |
| Country | United States |
| Primary timezone | America/Los_Angeles |
| Dialing format | +1 (510) NXX-XXXX |
Cities and Places Using Area Code 510
Based on prefix-level carrier data, area code 510 covers places including:
- Oakland, CA
- Fremont, CA
- Berkeley, CA
- Hayward, CA
- Alameda, CA
- San Leandro, CA
- Union City, CA
- Richmond, CA
- Crockett, CA
- Castro Valley, CA
- Hercules, CA
- Emeryville, CA
Frequently Asked Questions
Where is area code 510?
Area code 510 serves California, United States.
Who is calling me from area code 510?
A call from area code 510 most likely originates from California, but caller ID can be spoofed. If an unknown caller asks for personal or payment information, hang up and call the organization back on its official number.
How do I dial a 510 number?
Within North America: dial 1-510 followed by the 7-digit number. From abroad: your international prefix (like 00 or +), then 1 510 and the number.