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Clickable map of Arizona area codes in blue (and border states) The U.S. state of Arizona is served by five telephone area codes in three numbering plan areas: Area codes 602, 480, and 623 serve the Phoenix metropolitan area. The three area codes were recombined in 2023 into an overlay complex after a 1999 split:
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 ...
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
Area codes 213, 323, and 738 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of California. They are assigned in an overlay complex to a numbering plan area (NPA) that comprises, roughly, the area of downtown Los Angeles City, as well as several southeast Los Angeles County cities, such as Bell and ...
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California (nearly the entire city of Los Angeles outside of the San Fernando Valley and smaller cities and unincorporated areas of Los Angeles County immediately to the south or east) November 1, 2024: overlaid on 213/323; 739: not in use; available for geographic assignment 740
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