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Where is the 858 Area Code?
The 858 area code in southern California serves the northern and coastal parts of San Diego County. It was established in 1999 and overlays the 619 area code. It covers La Jolla, Poway, Del Mar, Solana Beach, Rancho Bernardo, Rancho Peñasquitos, Mira Mesa and Carmel Valley.
Time Zone
The 858 area code, covering northern San Diego County in southern California, including San Diego, La Jolla, Poway, and surrounding communities, follows the Pacific Time Zone (PT). This includes Pacific Standard Time (PST, UTC−8/GMT−8) during the winter months and Pacific Daylight Time (PDT, UTC−7/GMT−7) during daylight saving time in the summer.
About the 858 Area Code in California
The 858 area code has been serving San Diego County in southern California since 1999. It covers the northern and coastal parts of the county as part of an overlay with 619. This area plays a major role in the California economy because the region’s defense, technology, and life sciences sectors drive employment and revenue. San Diego’s economy accounts for about 7.8% of California’s GDP despite having roughly 8% of the state’s population, helping fuel jobs and economic activity across the county.
Key Economic Drivers in the 858 Region:
- Technology & Innovation: Qualcomm, ServiceNow, Teradata, Viasat
- Life Sciences & Biotech: Illumina, Xenco Medical, Neurocrine Biosciences, Halozyme Therapeutics
- Defense & Advanced Manufacturing: General Atomics, Shield AI, Cubic Corporation, FLIR Systems
- Tourism & Services: San Diego Zoo Safari Park, SeaWorld San Diego, Hotel del Coronado, LEGOLAND California
History of the 858 Area Code
The 858 area code was established on June 12, 1999, when it was split from the 619 area code to provide additional telephone numbers for northern and coastal parts of San Diego County as demand grew. Prior to that, the 619 area code had been created in 1982 from a split of area code 714 to serve the San Diego region.
Plans for further splitting 619 to create a new 935 area code were later canceled, and in June 2018, the boundary between 619 and 858 was eliminated, creating an overlay complex so that both area codes cover the same geographic area of San Diego County and require ten‑digit dialing for local calls.
Search Virtual Numbers With 858 Area Code in San Diego
Get an 858 area code phone number & reach more customers across San Diego County.
Some numbers require ID and address verification under local laws. Certain numbers also require A2P 10DLC registration to send SMS or MMS to the United States. Moreover, some numbers may not appear in this search because they are not generally offered to customers and are available only on request. Please Contact Support for assistance.
How Does an 858 Phone Number Work for Your Business?
An 858 area code phone number helps your business to appear local to customers across northern and coastal San Diego County, including La Jolla, Poway, Del Mar, and surrounding communities. This helps build trust, improve customer engagement, and strengthen regional brand recognition.
With an 858 number, businesses can make and receive calls on landlines, mobile phones, or through VoIP services. Due to the 858/619 boundary-elimination overlay, all local calls require area-code dialing. Depending on the carrier, callers must dial either the full 10-digit number or 11 digits with a leading 1 (for example, 1-858-XXX-XXXX), which follows standard dialing rules across the United States.
The virtual 858 phone number works across multiple devices and integrates with modern business communication tools, ensuring consistent contact with clients. Using a local 858 area code phone number also supports marketing and sales efforts by signaling that your business is nearby and easy to reach for potential customers.
Key Features of an 858 Area Code Virtual Phone Number
How to Get an 858 Area Code Phone Number?
You can get an 858 area code phone number through a virtual number provider. Just sign up on Calilio and follow the setup steps.
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Create an account on Calilio & log in to your dashboard.
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Navigate to the left sidebar & click the plus symbol (+) located next to the Number section.
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You will land on the My Number page; select the United States as the country for an 858 area code number.
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Select the Number Type and then choose the Capabilities (SMS, Voice, MMS).
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Scroll down, select an available number from the list, and click the "Add to Cart" button.
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In the final step, enter your name and click Confirm Purchase from the cart to complete payment and activate your virtual number.
Already Have a Local Phone Number with 858 Area Code?
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Benefits of an 858 Area Code for Businesses
Adopting an 858 area code number positions your business strategically in San Diego. Connect directly with the local community for improved customer engagement.
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Frequently Asked Questions
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