Area Code 858: North San Diego

Area code 858 is in North San Diego, California. Numbers that start with 858 are based in San Diego, La Jolla, Mira Mesa.

Area code 858 covers North San Diego in California. The primary cities served include San Diego, La Jolla, Mira Mesa.

Area code 858 is primarily associated with San Diego, along with La Jolla, Mira Mesa. It serves the broader North San Diego area.

Area code 858 is in California (CA). California has 35 area codes in total.

Area code 858 operates in the Pacific Time Zone. Keep this in mind when scheduling calls with contacts in the North San Diego area.

Yes, area code 858 is an overlay of area code 619. Both codes serve the same geographic area, North San Diego, and were introduced to meet growing demand for phone numbers. Because 858 is an overlay, 10-digit dialing is required for all local calls within the region.

Yes. Because 858 is an overlay sharing its territory with area code 619, 10-digit dialing, the full area code plus the 7-digit number, is required for all local calls within North San Diego.

No, area code 858 is a local geographic area code, not a toll-free number. Standard call charges apply based on your carrier plan. Toll-free area codes include 800, 833, 844, 855, 866, 877, and 888.

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