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  1. The North American Numbering Plan (NANP) divides the regions of its member nations into geographic numbering plan areas (NPAs). 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.

  2. This is a list of North American telephone area codes in effect for the North American Numbering Plan (NANP). The area to which an area code is officially assigned is known as a Numbering Plan Area (NPA). An area code is part of a telephone number in the United States, Canada, and the Caribbean.

  3. 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 international calling code 1.

  4. Places in NANPA (North American Numbering Plan Area) have been given area codes as if they were all areas inside one country. +1 United States of America Including U.S. territories in the Pacific Islands :

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