858 Area Code
Northern San Diego, California
Area code 858 is located in Northern San Diego, California. It covers San Diego (north), La Jolla, and surrounding areas in the Pacific time zone (UTC-8). Administered by NANPA.
Where is area code 858?
Area code 858 is located in Northern San Diego, California. It covers San Diego (north), La Jolla, and surrounding areas in the Pacific time zone (UTC-8).
Cities Covered by Area Code 858
Area code 858 primarily serves the Northern San Diego area of California. The exact coverage includes San Diego (north), La Jolla, and Mira Mesa, along with surrounding communities and suburbs.
Time Zone
Pacific Time — UTC-8
Area code 858 operates in the Pacific Time Zone. When calling 858 numbers from a different time zone, be sure to account for the time difference to reach people during business hours.
About Area Code 858
Area code 858 was introduced in 1999 as a geographic area code serving Northern San Diego, California. It remains the primary area code for this region. Area codes are administered by NANPA (North American Numbering Plan Administration), the organization responsible for managing phone number resources in the US and Canada.