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

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

    this was the first part of North America to have its code changed three times: from 213 to 714 1951: to 619 in 1982, and to 760 in 1997. was to have originally split off the portion of 760 serving San Diego County to a new 442 area code in late 2008/early 2009; that plan was cancelled. 2009: overlaid by 442. 761.

  3. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    International access. 011. List of dialing codes. The North American Numbering Plan (NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1. Some North American countries, most notably ...

  4. 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]

  5. List of California area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_California_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, respectively. [1] As of July 2023, California has 38 active area codes. Stockton, Modesto, Merced, Turlock; the northern San Joaquin Valley and the central Sierra ...

  6. Original North American area codes - Wikipedia

    en.wikipedia.org/wiki/Original_North_American...

    The original North American area codes were established by the American Telephone and Telegraph Company (AT&T) in 1947, after the demonstration of regional Operator Toll Dialing during the World War II period. The program had the goal of speeding the connecting times for long-distance calling by eliminating intermediary telephone operators.

  7. List of New York area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_New_York_area_codes

    NPA Year Current region 212: 1947 New York City: Manhattan only; overlays with 332, 646, and 917 : 315: 1947 Syracuse, Utica, Watertown, and north central New York; overlaid by 680.