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The North American Numbering Plan (NANP) divides the territories of its members 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.
Most of the Washington region's inner ring is a single local calling area, even though it is split between three area codes–the District's area code 202, Maryland's area code 301 and Northern Virginia's area code 703. For most of the second half of the 20th century, it was possible to dial any number in the metro area with just seven digits.
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. 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.
Area codes 809, 829, and 849 are telephone area codes in the North American Numbering Plan (NANP) for the Dominican Republic.Like all NANP members, the Dominican Republic uses country code 1, and has similar dialing procedures for dialing the 10-digit national telephone numbers, which consist of the area code, a three-digit central office code, and a four-digit line number.
Area code 902 was one of the nine original North American area codes in Canada established in October 1947. Area code 782 was added to the numbering plan area in August 2014, to form an overlay complex in relief to prevent telephone number shortages.
Numbering plan areas and area codes since May 2001 September 1997 [1] – May 2001 [2] July 1988 [3] – September 1997 [4] [5] October 1947 – July 1988 [6]. Massachusetts is divided into five distinct numbering plan areas (NPAs), which are served by nine area codes in the North American Numbering Plan (NANP), [7] organized as four overlay complexes and a single-area code NPA.
This is a list of telephone area codes of Pennsylvania. In 1947, the American Telephone and Telegraph Company divided Pennsylvania into four numbering plan areas (NPAs) and assigned distinct area codes for each. Since 1995, several relief actions in form of area code splits and overlays have expanded the list of area
This is a list of telephone area codes in the state of Nebraska. 308: Western Nebraska, including Grand Island and Kearney. 402/531: Eastern Nebraska, including Omaha and Lincoln, overlaid in 2011 [1] Under the original North American Numbering Plan of 1947, area code 402 covered all of Nebraska. Area code 308 was split off in 1954, and ...