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  2. 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 state ...

  3. Area codes 918 and 539 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_918_and_539

    Area codes 918 and 539 are telephone area codes serving Tulsa and northeast Oklahoma. Besides Tulsa, these area codes cover cities such as Bartlesville, Broken Arrow, Claremore, Gore, Jenks, McAlester, Muskogee, Okmulgee, Pryor, Sapulpa, Tahlequah, and northeastern Oklahoma. Area code 918 was created in 1953 as a split from area code 405.

  4. Area codes 415 and 628 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_415_and_628

    In 1953, the entire Bay Area was "reunited" in using area code 415. Area code 415 has been split three times due to the Bay Area's rapid economic growth and demand for telecommunication services: On March 1, 1959, area code 707 was created from the northern part, and area code 408 was created for San Jose, the South Bay, the Monterey Bay, and ...

  5. List of North American Numbering Plan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_North_American...

    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.

  6. File:Area codes CA.svg - Wikipedia

    en.wikipedia.org/wiki/File:Area_codes_CA.svg

    If this map is the primary area code map of California (master map), no area code appears in red. Map is correct as of 2023-07-02. To make changes, updates, and replacing the lesser maps (the ones for a specific area code block), this file uses CSS to define the colors for each region.

  7. Area codes 408 and 669 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_408_and_669

    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 408 and 669 are shown in red. Area codes 408 and 669 are telephone area codes in the North American Numbering Plan (NANP) in the U.S. state of California.

  8. Area codes 405 and 572 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_405_and_572

    The other three area codes serving Oklahoma are 918 and 539, which cover northeastern Oklahoma (including the city of Tulsa); and 580, which serves western and southern Oklahoma. Area code 405 was one of the original area codes put into service in 1947 by telecom giant AT&T. Until January 1, 1953, it covered the entire state of Oklahoma.

  9. Area codes 805 and 820 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_805_and_820

    Area codes 805 and 820 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of California. The numbering plan area (NPA) includes most or all of the counties of San Luis Obispo , Santa Barbara , Ventura , and the southernmost portions of Monterey County . 805 was split from area code 213 in 1957, and area code ...