408 area code is being used for dialing/telecommunication purposes in California, covering 10 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 408 is part of PST (Pacific Standard Time) timezone.
408 Area Code Covers 10 Cities
Check this below table to know 10 major cities (having more than 20,000 population) in California using numbering plan area code 408 for dialing/telecommunication purposes.
only one County Using 408 as Area Code
408 area code is being used in only one county of California for dialing/telecommunication purposes.
47 More NPA Codes Related to Area Code 408
1 or more of these 47 NPA codes are being used in the same or adjacent states of California in the United States.
Only One State Uses Area Code 408