858 area code is being used for dialing/telecommunication purposes in California, covering 2 major cities and only one county, according to (NANP) North American Numbering Plan for 3-digit Numbering Plan Area (NPA) code. All the areas using NPA code 858 is part of PST (Pacific Standard Time) timezone.
858 Area Code Covers 2 Cities
Check this below table to know 2 major cities (having more than 20,000 population) in California using numbering plan area code 858 for dialing/telecommunication purposes.
only one County Using 858 as Area Code
858 area code is being used in only one county of California for dialing/telecommunication purposes.
