858 Area CodeSan Diego, CA
Area code 858 covers San Diego and nearby communities in California, in the Pacific Time (PT) zone, home to about 2.3 million people across 34 cities. It overlays 619, so the same region uses both and every local call needs all ten digits.
Overview
- Major City
- San Diego
- State
- California (CA)
- Timezone
- Pacific Time (PT)
- Current Time
- Overlay
- Yes – shares area with 619
Where is area code 858?
Area code 858 serves part of San Diego, CA and the surrounding areas. It has a single overlay (619) that serves the same area.
Overview of the 858 Area Code
What is the 858 area code?
The 858 area code serves San Diego, California, alongside other established area codes. When you see a 858 number, it indicates a local number within this geographic area.
Why was area code 858 created?
The 858 area code was introduced as an overlay to add numbers in San Diego once the existing area code 619 began to run out of available prefixes. It added a new supply of numbers without requiring current residents to change their existing digits.
Geographic Coverage of the 858 Area Code
The 858 area code serves San Diego and surrounding areas in California. It operates within the Pacific Time (PT) time zone. It complements the coverage of area code 619. This area code covers several key cities, including:
- San Diego
- Chula Vista
- El Cajon
- La Mesa
- Santee
- National City
Got a call from an 858 number? It came from San Diego, CA. Since 858 overlays with 619, every local call in the region needs all ten digits to land on the right line. Inside 858, San Diego holds about 60% of the population; the rest is split across 33 smaller cities.
San Diego Area Codes Overview
San Diego is served by multiple area codes, reflecting its telecommunications needs. The 858 area code operates alongside 619. Here are the area codes serving this region:
The introduction of the 858 area code helped prevent number exhaustion, ensuring a continuous supply of phone numbers across the geographic area.
What cities does area code 858 cover?
| City | State | Population | % of Area Code | % of City |
|---|---|---|---|---|
| San Diego | CA | 1,404,452 | 21% | 96% |
| Chula Vista | CA | 278,546 | 3% | 100% |
| El Cajon | CA | 103,291 | 1% | 100% |
| La Mesa | CA | 60,767 | 1% | 100% |
| Santee | CA | 59,104 | 1% | 100% |
| National City | CA | 58,460 | 1% | 100% |
| Poway | CA | 49,435 | 2% | 91% |
| La Presa | CA | 34,169 | 0% | 100% |
| Spring Valley | CA | 28,205 | 0% | 100% |
| Lemon Grove | CA | 27,867 | 0% | 100% |
* Sources: Population – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). Area code assignments – NANPA CO Code data. See our data methodology.
Has area code 858 been reported for unwanted calls?
Yes – 770 unwanted-call complaints were reported to the FTC for numbers showing a 858 area code (May 29 – Jul 2, 2026).
- 66% robocalls
- ↓ 20% vs prior period
Most-reported subjects
- Other39%301
- Reducing your debt (credit cards, mortgage, student loans)22%168
- Dropped call or no message13%98
* Caller ID is easily spoofed, so these figures reflect the number shown on caller ID, not the caller's true location – an area code alone never identifies a caller. The FTC does not verify the facts in these complaints. Source: FTC Do Not Call (DNC) Reported Calls Data, retrieved 2026-07-05.
Which prefixes and exchanges belong to area code 858?
51% assigned to a telco
- 79% Landline
- 21% Wireless
- 0% Unknown
| Prefix | Usage | Carrier |
|---|---|---|
| (858)200- | Landline | Tpx Communications |
| (858)201- | Landline | Level 3 Communications |
| (858)202- | Landline | Pacific Bell |
| (858)203- | Landline | Onvoy |
| (858)204- | Wireless | Verizon Wireless |
| (858)205- | Wireless | T-Mobile Usa |
| (858)206- | Landline | Ymax Communications |
| (858)207- | Landline | Teleport Communications America |
| (858)208- | Wireless | New Cingular Wireless Pcs |
| (858)209- | Wireless | T-Mobile Usa |
Frequently Asked Questions about the 858 Area Code
Who called me from a 858 number?
A 858 number is assigned to San Diego, California, so a call may come from there. But caller ID is easy to fake, and scammers often spoof a local 858 code to look nearby, so a 858 number doesn't prove the caller is local. Recently, 770 unwanted-call complaints were reported to the FTC for numbers showing the 858 code (66% flagged as robocalls). If you don't recognize the number, let it go to voicemail; a real caller will leave a message.
Is 858 a scam area code?
No area code is a scam on its own. 858 is a normal, officially assigned code for San Diego, California. Spam callers spoof local codes to raise the odds you answer, so 858 on your caller ID says nothing about who is really calling. Recently, 770 unwanted-call complaints were reported to the FTC for numbers showing the 858 code (66% flagged as robocalls). Judge the call itself, not the area code.
Why do I keep getting calls from the 858 area code?
Repeated calls from different 858 numbers are usually spoofing: a robocaller rotates through 858 numbers so each call looks local and slips past simple blocks. Recently, 770 unwanted-call complaints were reported to the FTC for numbers showing the 858 code (66% flagged as robocalls). Blocking one number rarely helps; voicemail screening, your carrier spam filter, and the Do Not Call Registry work better.
Should I answer an unknown 858 number?
If you aren't expecting a 858 call, let it ring to voicemail. Legitimate callers leave a message, most robocallers hang up when no one picks up, and answering can mark your number as active and bring more calls.
How do I block calls from the 858 area code?
Block a single 858 number from your recent-calls list (iPhone: tap the number, then Block this Caller; Android: tap the number, then Block or report spam). To cut the volume, turn on Silence Unknown Callers on iPhone or spam protection on Android, enable spam filtering from your carrier, and register at DoNotCall.gov. Blocking the entire 858 code also stops legitimate local calls, so use it only as a last resort.
Where is area code 858?
Area code 858 covers San Diego and the surrounding area in California, spanning 34 cities with about 2,322,426 residents. It shares its area with overlay code 619.
Is 858 a real area code?
Yes. 858 is an active code in the North American Numbering Plan, assigned by NANPA and in service for San Diego, California. A real code can still show up on spoofed spam calls, so treat unknown 858 calls with normal caution.
What timezone is the 858 area code in?
The 858 area code is in the Pacific Time (PT). Because a number can be kept when someone moves or switches to VoIP, a specific 858 caller may not be in that zone.
How do I call a 858 number from abroad?
From outside the US, dial your country's exit code, then 1 (the US country code), then 858 and the seven-digit number. From a mobile phone you can usually just enter +1 858 followed by the number and let the phone add the exit code for you.