510 area code
Oakland area, Pacific Time.Area code 510 covers Oakland, Fremont-Newark, Hayward and 4 more places in California, on Pacific Time. 341 covers the same area.
Right now in Oakland
Pacific Time (PST, UTC-8; PDT, UTC-7 in summer)
Calling hours: Every day, 8 AM to 9 PM (the federal rule)
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Where 510 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 510 has 7. Each one's share is how many 510 numbers start there. Its biggest metro area is San Francisco-Oakland-Fremont, CA.
- Oakland53%
- Fremont-Newark19%
- Hayward15%
- Richmond7%
- El Sobrante-Pinole4%
Also: Hercules-Rodeo, Crockett
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 510 number?
Sales calls to homes and cell phones have legal hours, set by the federal rule. Hold every 510 number to them, since you can't tell a work line from a personal cell.
What applies to 510Every day, 8 AM to 9 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
510 and 341
510 went into service on September 2, 1991, split off from 415, and 925 was later split off from it. 510 and 341 cover the same area, so new numbers can get either code and neighbors can have different area codes. 510 holds 88% of the area's exchanges; 341 holds the rest. Local calls take all 10 digits.
- 1991510 starts
- 1998925 split off
- 2019341 overlay
Source: NANPA area code database
Other California area codes
All California area codes- Stockton209350
- Los Angeles213323738
- Sacramento279916
- Compton310424
- Fresno357559
- Santa Rosa369707
- San Jose408669
- San Francisco415628
- Oceanside442760
- Chico530837
- Long Beach562
- San Diego619858
- Alhambra626
- Palo Alto650
- Anaheim657714
- Bakersfield661
- Van Nuys747818
- Santa Barbara805820
- Salinas831
- Ontario840909
- Walnut Creek925
- Irvine949
- Riverside951
Calling a list of 510 numbers?
Paste it into the free phone number validator. It checks every number, finds each one's time zone and sorts the list by who you can call right now.
510 area code FAQ
What area code is 510?
510 is a California area code for Oakland, Fremont-Newark, Hayward, Richmond and 3 more places.
What time zone is the 510 area code in?
Pacific Time (PST, UTC-8; PDT, UTC-7 in summer).
Is 341 the same as 510?
Same area, different code. 510 and 341 cover the same area (an overlay), so new numbers can get any of them and local calls take all 10 digits.
What are the calling hours for 510 numbers?
Every day, 8 AM to 9 PM, local time, under the federal rule.
When did the 510 area code start?
On September 2, 1991. It was split from 415.
Calling 510 numbers? Reach more of them.
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