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Area code 510

Area code 510 Oakland, California

Area code 510 is in California, with numbers assigned in Oakland, Franklin, Hayward and 4 more places. It’s 9:14 PM there now.

State
California41 area codes in California
Time zone
Pacific9:14 PM there now
Exchanges
7857 places
Overlay
341Same area, 10-digit dialing
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Where area code 510 is

Numbers in 510 are assigned to 7 places in 4 counties: Alameda County, Sacramento County, Contra Costa County and Riverside County.

Oakland holds most of them: 53% of the exchanges.

  • Oakland415
  • Franklin151
  • Hayward117
  • Richmond53
  • El Sobrante28
  • Hercules14
  • Crockett7

Phone companies in 510

785 blocks of numbers in 510 are held by 29 phone companies. The most belong to AT&T (277), T-Mobile (110) and AT&T Mobility (78).

A mix: about 32% wireless, 37% local phone and cable and 31% other carriers, including internet phone services.

A block’s holder is the company it was first assigned to; numbers can move to other carriers since.

History and overlays

510 went into service in 1991, added to the area of 415.

341 (since 2019) shares the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.

15 new exchanges were assigned since 2021, the latest in February 2026.

Calling 510

It’s 9:14 PM Pacific time in 510 right now.

From elsewhere in the U.S., dial 1, 510 and the 7-digit number; inside the area, all 10 digits too.

Nearby area codes

California has 41 area codes: 209, 213, 279, 310, 323, 341, 350, 357, 369, 408, 415, 424, 442, 510, 530, 559, 562, 619, 626, 628, 650, 657, 661, 669, 707, 714, 738, 747, 760, 805, 818, 820, 831, 837, 840, 858, 909, 916, 925, 949 and 951.

From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.

Map of the 510 area code

Map of the 510 area code around Oakland, Franklin and Hayward, California.

Interactive map © OpenStreetMap contributors

Cities on the map

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Questions about 510

Where is area code 510?

In California, covering Oakland, Franklin and Hayward and other places across 4 counties.

What time zone is 510 in?

Pacific time. It was 9:14 PM there when this page loaded.

Is 510 an overlay?

Yes. 341 serves the same area, so dial all 10 digits for local calls.

Which phone companies have 510 numbers?

29 companies hold blocks; the most belong to AT&T, T-Mobile and AT&T Mobility. About 32% of blocks are wireless.

Is 510 running out of numbers?

Not on record. 15 new exchanges have been assigned since 2021.