858 Area Code
The 858 area code serves Del Mar, La Jolla, La Mesa, Poway, Rancho Penasquitos in United States. Learn the cities and counties covered, the time zone, dialing format, and how to get a local 858 business number.
Cities & regions in the 858 area code (6)
Frequently asked questions
What area code is 858?+
858 is a North American Numbering Plan (NANP) area code in United States, primarily covering Del Mar, La Jolla, La Mesa, Poway, Rancho Penasquitos.
Where is the 858 area code located?+
The 858 area code is located in United States. It operates on Pacific Time (PT).
How do you dial the 858 area code from abroad?+
Dial your country's international exit code, then +1 858 followed by the 7-digit local number. From inside the US/Canada, dial 1 858 XXX-XXXX.
Can I get a 858 phone number for my business?+
Yes. AstraQom provisions local 858 DID numbers for SIP trunking, hosted PBX, contact centers and toll-free porting — usually within minutes, with no long-term contract.
Get a local 858 number for your business
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AstraQom is an independent global telecom carrier serving 117 countries. We provision local 858 DID numbers, SIP trunks, hosted PBX, contact-center routing and SD-WAN — all on Tier-1 carrier infrastructure with no grey termination and 24/7 multilingual support.