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US area code · California

858 area code

Where the 858 area code is, its overlay and how to dial a +1 858 number from anywhere.

CoversSan Diego, CaliforniaTime zonePacific (PT)TypeOverlay
Quick answer

The 858 area code is in San Diego, California, United States (Pacific (PT)). To call from abroad: +1 858 555-0123. It is an overlay, so all 10 digits are dialled.

StateCalifornia
Main areaSan Diego
Time zonePacific (PT)
TypeOverlay
10-digit dialingRequired
In service since30-Jun-1998

The 858 area code is a geographic North American Numbering Plan (NANP) code covering San Diego, California. It has been in service since 30-Jun-1998 and sits in the Pacific (PT) time zone.

Overlay 858 shares its region

Several area codes cover the same geographic area, so two neighbours can have different codes. Because of the overlay, you must dial all 10 digits (area code + number) even for local calls.

858619

How to dial a 858 number

From abroad+1 858 555-0123
Within the US / Canada1 858 555-0123
Locally (same area)858 555-0123

Cities in the 858 area code

A 858 number is usually in one of these places in California — 1 county.

Poway San Diego

Other California area codes

209213279310323341350357369408415424442510530559

Frequently asked questions

Where is the 858 area code?

The 858 area code is in San Diego, California, United States (Pacific (PT)).

Is 858 an overlay area code?

Yes. 858 overlays the same region as 619, so callers dial all 10 digits.

Do I have to dial 10 digits for 858?

Yes — dial the area code plus the seven-digit number.

How do I call a 858 number from another country?

Dial your exit code (or +), then 1, then 858, then the number: +1 858 555-0123.

Source: NANPA numbering plan. An area code covers a region, not a precise address — a 858 number does not pinpoint a street or ZIP code.

Number holders in area code 858

Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 577 prefixes are in use in 858, shared by 44 companies. The largest holders:

CompanyPrefixesShare
Pacific Bell15226%
New Cingular Wireless PCS, LLC509%
T-Mobile USA, Inc.448%
Fractel, LLC356%
Onvoy, LLC346%
Mcimetro Access Transmission Services LLC326%

Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.

Complaints about 858 numbers

Reports to the FTC, last 30 days
511
Recorded messages or robocalls
58%
Rank among area codes
#197 of 670
Most reported subjects
Other (243)
Reducing your debt (credit cards, mortgage, student loans) (94)
Calls pretending to be government, businesses, or family and friends (63)

Period Aug 26 – Sep 24, 2026. These are the numbers shown on the caller ID of the reported calls; many are spoofed and do not belong to the real caller.

Source: US Federal Trade Commission, Do Not Call reported calls data (daily files).

All US area codes United States +1 Map of area code 858 — cities & rate centres

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