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  1. 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 Mexico, do not participate with the NANP.

  2. 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.

    Code
    Territory Or Use
    Date
    200
    not in use; available for non-geographic ...
    easily recognizable code (ERC)
    New Jersey ( Bergen County and Hudson ...
    1947
    1947
    Southwestern Connecticut ( Bridgeport, ...
    1947
  3. National telephone numbers are defined by national or regional numbering plans, such as the European Telephony Numbering Space, the North American Numbering Plan (NANP), or the UK number plan. Within a national numbering plan, a complete destination telephone number is typically composed of an area code and a subscriber telephone number.

  4. The North American Numbering Plan ( NANP) is a telephone numbering plan. It includes 24 countries and territories, including the United States, Canada, Bermuda, and 17 nations of the Caribbean. [1] [2] There are three-digit area codes and seven-digit telephone numbers.

  5. 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 Mexico, do not participate with the NANP.

  6. Telephone number representation. Canadian (and other North American Numbering Plan) telephone numbers are usually written as NPA-NXX-XXXX. For example, 250 555 0199, a fictional number, could be written as (250) 555-0199, 250-555-0199, 250-5550199, or 250/555-0199.