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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. 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.
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.
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 510 is shown in red. Area codes 510 and 341 are telephone area codes in the North American Numbering Plan (NANP) serving much of the East Bay in the U.S. state of California.
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 codes 657 and 714 are shown in red. Area codes 714 and 657 are telephone area codes in the North American Numbering Plan for the southern part of the U.S. state of California.
The area code had telephone numbers assigned for the central office code 988, which was designated as a nationwide three-digit dialing code for the 988 Suicide & Crisis Lifeline in 2022. This created a conflict for all NPAs with central office codes of 988 that still permitted seven-digit dialing , [ 1 ] requiring all such NPAs to transition to ...
Until the late 1970s, central office code protection was maintained between area codes 415 and 408, so that Telephone numbers were not duplicated across, and subscribers could dial seven-digit San Francisco or Berkeley numbers without dialing an area code. Population growth, facsimile machines, and pagers caused demands for numbers to outrun ...
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 619 is shown in red. Area codes 619 and 858 are telephone area codes in the North American Numbering Plan (NANP) for most of San Diego County in the U.S. state of California.
This map is clickable; click on any region shown to visit the page for those area codes.Area codes 415 and 628 are shown in red. Area codes 415 and 628 are telephone area codes in the North American Numbering Plan (NANP) for the city of San Francisco and its northern suburbs in Marin County (across the Golden Gate ), and the northeast corner of ...
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