San Diego, California

Where Is Area Code 858?

Area code 858 serves the northern coastal and northern inland parts of the city of San Diego in Southern California. It is in San Diego County and is part of the larger San Diego metropolitan phone system. The area uses Pacific Time.

Area code 858 covers communities such as La Jolla, Del Mar, Encinitas, Solana Beach, Poway, Rancho Santa Fe, Scripps Ranch, Mira Mesa, Carmel Valley, and University City. It also serves parts of northern San Diego and nearby communities in the county. San Diego is the main city tied to the area code.

Area code 858 includes well-known coastal and research centers. These include the La Jolla shoreline, Torrey Pines State Natural Reserve, the University of California San Diego, and parts of the Torrey Pines Mesa research area. The area sits along the Pacific coast and includes both beach communities and inland suburban neighborhoods.

History of Area Code 858

Area code 858 was created on June 12, 1999, in a split from area code 619. The split was approved because the San Diego region needed more telephone numbers as population and business growth increased. Before 1999, the same communities used 619.

Area code 858 later became part of an overlay system. On June 17, 2017, area code 279 was added as an overlay to 858 in the same numbering plan area. That change required 10-digit dialing for local calls in the 858 region.

Key Facts About Area Code 858

• Area code 858 is in California and is most closely associated with San Diego.
• Area code 858 serves parts of San Diego County in Southern California.
• Area code 858 is in the Pacific Time Zone.
• Area code 858 was created on June 12, 1999, as a split from area code 619.
• Area code 279 overlays area code 858, and the overlay took effect on June 17, 2017.
• Area code 858 covers communities such as La Jolla, Del Mar, Encinitas, Poway, Solana Beach, and Rancho Santa Fe.
• Area code 858 includes major institutions and landmarks such as the University of California San Diego, Torrey Pines State Natural Reserve, and research centers in La Jolla.
• Area code 858 is a geographic area code, not a toll-free code.

Frequently Asked Questions

What state is area code 858 in?

Area code 858 is in California.

What major cities use area code 858?

Area code 858 serves parts of San Diego and communities such as La Jolla, Del Mar, Encinitas, Solana Beach, and Poway.

Is area code 858 a toll-free number?

No. Area code 858 is a geographic area code for the San Diego, California region.