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area code

Biggest city:

San Diego




Pacific (GMT -8)

Nearby area codes: 

Zip codes



Major Cities:

San Diego, Del Mar, Rancho Santa Fe

San Diego

Average Income:





Unemployment Rate:

Area code 858 is an important part of the telephone numbering plan in the United States, specifically in California. Geographical Coverage: Area code 858 serves parts of San Diego County in California. This includes the northern suburbs of San Diego, such as Poway, Del Mar, and Rancho Bernardo, among others. The area is known for its scenic beauty, including beaches and parks, as well as its vibrant communities. Establishment and History: The 858 area code was created in 1999, following a split from area code 619. This division was necessitated by the growing demand for telephone numbers in the region, particularly with the rise of cell phones and internet connectivity. Recent Changes: As of 2018, the 858 and 619 area codes have been merged into an overlay plan. This means that both area codes now cover the entire city of San Diego and its suburbs. The overlay allows for a greater number of available phone numbers in the region and requires 10-digit dialing (area code + phone number) for all local calls. In conclusion, area code 858 represents a significant and dynamic region of Southern California, particularly the San Diego area. Its evolution, including the transition to an overlay plan with area code 619, reflects the growing and changing telecommunications needs in this vibrant part of California.
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