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  2. Area codes 916 and 279 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_916_and_279

    It originally covered most of northeastern California, but area code splits have reduced its coverage to the greater Sacramento area. Area code 279 began service in March 2018 to relieve an exhausted supply of telephone numbers in the 916 area code.

  3. List of California area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_California_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. 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 ...

  4. Area code 530 - Wikipedia

    en.wikipedia.org/wiki/Area_code_530

    Area code 530 is a telephone area code in the North American Numbering Plan (NANP) in northeastern and Northern California. It was created in 1997 in an area code split of 916 . The numbering plan area (NPA) includes the Sacramento Valley (including some outer suburbs of Sacramento ), Shasta Cascade , and the northern Sierra Nevada .

  5. Telephone exchange names - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange_names

    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]

  6. Pacific Bell - Wikipedia

    en.wikipedia.org/wiki/Pacific_Bell

    To place calls to certain other Northern California exchanges, such as Sacramento, Stockton, and Vallejo in Northern California, dial customers would dial "0" to reach an operator. The operator dialed through a tandem switch and directly called numbers in those cities. These calls were indicated by a star in the telephone directory.

  7. Area codes 415 and 628 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_415_and_628

    As part of this realignment, Sacramento was renumbered from area code 415 to 916, and Bakersfield to 213. With the preparations for nation-wide direct distance dialing (DDD) in the early 1950s, area code 318 was temporarily used in the San Francisco area, initially by customers in Englewood, New Jersey , participating in the first customer ...

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