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858 Area Code

Area code 858 serves San Diego, Chula Vista, El Cajon, La Mesa, Santee and nearby communities in California. It has been in service since June 12, 1999, when it was split from 619.

StateCalifornia
Time zonePacific
Local time now…
Prefixes in use563
Overlay with619
Projected to run out2039
San DiegoChula VistaEl CajonLa MesaSanteeNational CityPowayLa PresaSpring ValleyLemon GroveImperial BeachRancho San DiegoWinter GardensLakesideCoronadoCasa de Oro-Mount HelixBostoniaBonitaSolana BeachJamulEucalyptus HillsSan DiegoChula VistaPowaySpring Valley
Cities and towns served by area code 858

Who issues 858 numbers

Mobile 22%VoIP and cable 29%Landline 48%

Share of the 563 prefixes (the three digits after 858) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
AT&T (Pacific Bell)152
AT&T Mobility50
T-Mobile44
Lumen (Level 3)38
Onvoy (Sinch)37
Fractel35
Verizon Business (MCImetro)33
Verizon Wireless31

Cities and towns in area code 858

CityPopulationOther area codes
San Diego1,406,106619
Chula Vista275,533619
El Cajon101,755619
La Mesa59,914619
Santee58,205619
National City57,807619
Poway49,180
La Presa36,669619
Spring Valley32,215619
Lemon Grove27,936619
Imperial Beach25,206619
Rancho San Diego22,264619
Winter Gardens22,003619
Lakeside21,788619
Coronado21,094619
Casa de Oro-Mount Helix19,651619
Bostonia16,545619
Bonita13,336619
Solana Beach12,602
Jamul6,617619
Eucalyptus Hills5,976619

Got a call from 858?

A 858 number was originally issued in California, but that does not prove the caller is there. 29% of 858 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 563 prefixes in area code 858

Format: (858) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 858

Where is area code 858?
Area code 858 is in California. It covers San Diego, Chula Vista, El Cajon, La Mesa, Santee, National City and 15 more cities and towns.
What time zone is area code 858?
Area code 858 is in the Pacific time zone.
Is 858 a toll-free number?
No. 858 is a geographic area code in California. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Why does 858 share its area with 619?
619 and 858 form an overlay: they cover the same territory, so new numbers there can get any of these codes, and local calls need all 10 digits.
Will area code 858 run out of numbers?
NANPA's latest forecast projects the 619/858 overlay to exhaust in the third quarter of 2039. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in California