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US area code · California

Area code 858

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.

Missed a call from +1 858?

In the 30 days to September 24, 2026, 511 unwanted calls showing a 858 number were reported to the US Federal Trade Commission, 58% of them recorded messages or robocalls. That puts 858 at #197 of 670 area codes reported.

Other243
Reducing your debt (credit cards, mortgage, student loans)94
Calls pretending to be government, businesses, or family and friends63
Dropped call or no message41
Before you call back
  • If you do not know anyone in California, do not call back: a genuine caller will leave a message or send a text.
  • Scammers fake the number shown on caller ID, so a 858 number can hide a caller anywhere in the world.
  • Never give a code received by text or a bank detail to an unknown caller. In the US, calls can be reported at reportfraud.ftc.gov.

Who issues +1 858 numbers

Phone companies hold blocks of numbers in each area code. The main holders in 858:

Pacific Bell 152New Cingular Wireless PCS, LLC 50T-Mobile USA, Inc. 44Fractel, LLC 35Onvoy, LLC 34Mcimetro Access Transmission Services LLC 32

About 21.7% of the 577 prefixes in use belong to mobile carriers: a 858 number is often a cell phone, and it may have moved to another carrier since.

Sources: FTC Do Not Call reported calls (numbers as reported by consumers, not verified), NANPA central office code assignments.

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