Find any 858- phone number in California
The 858 area code is a California telephone numbering plan area code. This area code is used in coastal towns and cities from Orange County to the border of Mexico, and serves the San Diego metropolitan area. It was created in 1999 as a split from the 619 code and now shares this area with the 619 and 760 codes. 858 is also the first California area code to begin with an eight.
Area codes are assigned to each state by the North American Numbering Plan Administrator (NANPA). The area codes are used to route telephone calls from one area to the other. Each area code is part of a larger telephone numbering system that helps to determine which geographic area the call is coming from and routing it accordingly. The codes are determined geographically and each area code consists of a central office code and a service area code. The 858 area code is comprised of eight non-contiguous sectional areas, including an island section and one for historical reasons. Each area code is unique and helps the NANPA coordinate and manage phone services for many states.