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In 1947, the American Telephone and Telegraph Company (AT&T) devised the first nationwide telephone numbering plan and assigned the original North American area codes. The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state ...
Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
Numbering plan areas in California (blue) and border states. This map is clickable; click on any region shown to visit the page for those area codes.
0–9. Area codes 209 and 350; Area codes 213, 323, and 738; Area codes 310 and 424; Area codes 408 and 669; Area codes 415 and 628; Area codes 510 and 341
In California and New York, because of the existence of both overlay area codes (where an area code must be dialed for every call) and non-overlay area codes (where an area code is dialed only for calls outside the subscriber's home area code), "permissive home area code dialing" of 1 + the area code within the same area code, even if no area ...
Orange County Area. Santa Ana-Anaheim-Irvine, CA. Santa Ana; South Coast Metro; Santa Ana Valley; Saddleback Valley; Santa Ana Mountains; San Diego–Tijuana. San Diego metropolitan area. North County. North County Coastal; North County Inland; Temecula Valley; East County. Mountain Empire; South Bay
The current area code is “in high demand” and is expected to be depleted by September 2025. An overlay “adds a second area code to the same geographic region.”
Pages in category "Lists of United States area codes" The following 52 pages are in this category, out of 52 total. ... List of California area codes;