Where Is Area Code 858?
Area code 858 serves northern San Diego and nearby communities in San Diego County, California. It covers parts of the city of San Diego, including La Jolla, Mira Mesa, Rancho Bernardo, Scripps Ranch, and University City. It also covers cities such as Del Mar, Poway, and Solana Beach.
The 858 service area includes coastal and inland parts of northern San Diego County. Notable places include the University of California San Diego, Scripps Institution of Oceanography, Torrey Pines State Natural Reserve, and Torrey Pines Golf Course. The Pacific Ocean borders the region to the west, while inland hills and valleys extend eastward.
Cities and Communities in the 858 Area Code
- Carmel Valley, San Diego County
- Clairemont, San Diego County
- Del Mar, San Diego County
- Kearny Mesa, San Diego County
- La Jolla, San Diego County
- Mira Mesa, San Diego County
- Pacific Beach, San Diego County
- Poway, San Diego County
- Rancho Bernardo, San Diego County
- Rancho Peñasquitos, San Diego County
- Rancho Santa Fe, San Diego County
- San Diego, San Diego County
- Scripps Ranch, San Diego County
- Solana Beach, San Diego County
- Torrey Hills, San Diego County
- Torrey Pines, San Diego County
- University City, San Diego County
History of Area Code 858
Area code 858 was established in 1999 as a split from area code 619. The split created a separate code for northern San Diego County while 619 continued to serve central and southern parts of the county.
Telephone-number demand grew as San Diego County added residents, businesses, wireless phones, and other communication services. California regulators later made 858 and 619 an overlay in 2008. The overlay allowed both codes to be assigned within the same broad San Diego calling region and preserved existing customer numbers.
Key Facts About Area Code 858
- Area code 858 is a California area code, and San Diego is its primary city.
- Area code 858 is located in San Diego County, California.
- Area code 858 belongs to the Pacific region of the United States Census Bureau.
- Area code 858 uses Pacific Time.
- Area code 858 is a geographic area code, not a toll-free code.
- Area code 858 was created in 1999 by splitting area code 619.
- Area codes 858 and 619 have operated as an overlay since 2008.
- The University of California San Diego and Scripps Institution of Oceanography are located in La Jolla, a San Diego community associated with area code 858.
- Torrey Pines State Natural Reserve and Torrey Pines Golf Course are notable landmarks in the area.
Frequently Asked Questions
What state is area code 858 in?
Area code 858 is in California.
What major cities use area code 858?
San Diego, Del Mar, Poway, and Solana Beach use area code 858.
What time zone is area code 858 in?
Area code 858 uses Pacific Time.
Is area code 858 a toll-free number?
No. Area code 858 is a geographic area code, not a toll-free number.