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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, respectively. [1] As of July 2023, California has 38 active area codes.
This list may not reflect recent changes. List of California area codes; 0–9. Area codes 209 and 350; Area codes 213, 323, and 738; Area codes 310 and 424;
The North American Numbering Plan (NANP) divides the territories of its members into geographic numbering plan areas (NPAs). Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits.
In 1947, when 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: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. [1]
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.Area code 805 is shown in red. Area codes 805 and 820 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of California.
This included most of Southern California, generally south and east of Los Angeles, extending to the Arizona and Nevada state lines to the east, and south as far as the Mexican border (what is now area codes 442/760, 619, 858, 909, and 951). Despite Southern California's growth in the second half of the 20th century, this configuration remained ...
By 1975, 358 had been added as an additional central office prefix. [8] The Mountain Office served the Summit Road community and areas of the Santa Cruz Mountains west of town. Although the office code or prefix for service from this switch was ELgato-3 (353), it was not referred to as the Three Office. During the 1970s and early 1980s, the ...
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.Area code 209 is shown in red. Area codes 209 and 350 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of California.