Area code 510
Area code 510 serves Oakland and nearby parts of California, including Fremont, Hayward and Berkeley. It is on Pacific Time, which observes daylight saving time. 341 is an overlay for the same area.
Area code 510 at a glance
| State | California (CA) |
| Main city | Oakland |
| Time zone | Pacific Time |
| UTC offset | UTC−8 in winter, UTC−7 in summer |
| Daylight saving time | Yes |
| Overlay codes | 341 |
Cities in 510
- Oakland
- Fremont
- Hayward
- Berkeley
An area code shows where a number was first assigned. Mobile numbers keep their area code when people move, so the person you’re calling may be somewhere else.
When you can call a 510 number
Federal telemarketing rules under the TCPA allow sales calls between 8 AM and 9 PM in the called person’s local time. Here is that window for a 510 number, shown in your own time zone.
General information, not legal advice. Some states add rules for Sundays, holidays or the number of calls. See our calling hours guide.
| If you’re on | You can call 510 between |
|---|---|
| Eastern | 11:00 AM to 12:00 AM |
| Central | 10:00 AM to 11:00 PM |
| Mountain | 9:00 AM to 10:00 PM |
| Arizona | 8:00 AM to 9:00 PM |
| Pacific | 8:00 AM to 9:00 PM |
See the time in 510 without leaving your CRM
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Other area codes in California
Questions about 510
What time zone is area code 510?
Area code 510 is on Pacific Time. It observes daylight saving time.
Where is area code 510?
Area code 510 is in California. Its main city is Oakland, and it also covers Fremont, Hayward and Berkeley.
What are the legal hours to call a 510 number?
Under the federal TCPA, sales calls are allowed from 8 AM to 9 PM in the called person’s local time. Personal and informational calls are not limited by these hours.
What area codes overlay 510?
341 covers the same area as 510, so numbers in the same town can have either code.