858 area code
Where the 858 area code is, its overlay and how to dial a +1 858 number from anywhere.
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.
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.
How to dial a 858 number
+1 858 555-01231 858 555-0123858 555-0123Cities in the 858 area code
A 858 number is usually in one of these places in California — 1 county.
Other California area codes
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:
| Company | Prefixes | Share |
|---|---|---|
| Pacific Bell | 152 | 26% |
| New Cingular Wireless PCS, LLC | 50 | 9% |
| T-Mobile USA, Inc. | 44 | 8% |
| Fractel, LLC | 35 | 6% |
| Onvoy, LLC | 34 | 6% |
| Mcimetro Access Transmission Services LLC | 32 | 6% |
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