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Area code 858

Area code 858 San Diego, California

Area code 858 is in California, with numbers assigned in San Diego, Poway, Del Mar and 9 more places. It’s 9:14 PM there now.

State
California41 area codes in California
Time zone
Pacific9:14 PM there now
Exchanges
56312 places
Overlay
619Same area, 10-digit dialing
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Where area code 858 is

Numbers in 858 are assigned to 12 places in 1 county: San Diego County.

San Diego holds most of them: 60% of the exchanges.

  • San Diego339
  • Poway45
  • Del Mar45
  • Chula Vista18
  • Rancho Santa Fe14
  • El Cajon14
  • La Mesa8
  • National City5
  • Coronado4
  • Pine Valley2
  • Jacumba1
  • Campo1

Phone companies in 858

563 blocks of numbers in 858 are held by 37 phone companies. The most belong to AT&T (151), AT&T Mobility (50) and T-Mobile (45).

A large share, about 48%, belongs to competitive and internet phone carriers; wireless networks hold 22% and local phone and cable companies 30%.

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

History and overlays

858 went into service in 1999, added to the area of 619.

619 (since 1982) shares the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.

112 new exchanges were assigned since 2021, the latest in October 2026.

Calling 858

It’s 9:14 PM Pacific time in 858 right now.

From elsewhere in the U.S., dial 1, 858 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 858 area code

Map of the 858 area code around San Diego, Poway and Del Mar, California.

Interactive map © OpenStreetMap contributors

Cities on the map

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Questions about 858

Where is area code 858?

In California, covering San Diego, Poway and Del Mar and other places across 1 county.

What time zone is 858 in?

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

Is 858 an overlay?

Yes. 619 serves the same area, so dial all 10 digits for local calls.

Which phone companies have 858 numbers?

37 companies hold blocks; the most belong to AT&T, AT&T Mobility and T-Mobile. About 22% of blocks are wireless.

Is 858 running out of numbers?

Not on record. 112 new exchanges have been assigned since 2021.