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

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

    Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits. A numbering plan area with multiple area codes is called an overlay. Area codes are also assigned for non-geographic purposes.

  3. 555 (telephone number) - Wikipedia

    en.wikipedia.org/wiki/555_(telephone_number)

    The telephone number prefix 555 is a central office code in the North American Numbering Plan, used as the leading part of a group of 10,000 telephone numbers, 555-...., in each numbering plan area (NPA) (area code). It has traditionally been used only for the provision of directory assistance, when dialing NPA-555-1212.

  4. Lists of North American area codes - Wikipedia

    en.wikipedia.org/wiki/Lists_of_North_American...

    The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union.

  5. Toll-free telephone numbers in the North American Numbering ...

    en.wikipedia.org/wiki/Toll-free_telephone...

    The first automated toll-free telephone numbers were assigned with area code 800, created as inbound Wide Area Telephone Service (InWATS) in 1966 (U.S. intrastate) and 1967 (interstate). These terminated on special fixed-rate trunks which would accept calls from a specified calling area with either no limit or a specific maximum number of hours ...

  6. Area codes 305, 786, and 645 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_305,_786,_and_645

    Original NANP area codes of Florida and surrounding states. In 1947, the American Telephone and Telegraph Company (AT&T) announced the first nationwide telephone numbering plan and divided the United States and Canada into 86 numbering plan areas and assigned the original North American area codes, a unique code for each area, to speed the connection times for operator toll dialing.

  7. Area codes 760 and 442 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_760_and_442

    These area codes serve an overlay complex that comprises much of the southeastern and southernmost portions of California. It includes Imperial, Inyo, and Mono counties, as well as portions of North County San Diego, Riverside, San Bernardino, Los Angeles and Kern counties. Area code 760 was created on March 22, 1997 in a split of area code 619 ...