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Original numbering plan areas and area codes of Minnesota in 1952. When the American Telephone and Telegraph Company (AT&T) created the first nationwide telephone numbering plan for Operator Toll Dialing in 1947 to automate and speed the connection of long-distance calls, the United States and Canada were divided into 86 geographic numbering plan areas (NPAs) and assigned the original North ...
Numbering plan areas and area codes since May 2001 September 1997 – May 2001 July 1988 – September 1997 October 1947 – July 1988. Massachusetts is divided into five distinct numbering plan areas (NPAs), which are served by nine area codes in the North American Numbering Plan (NANP), [1] organized as four overlay complexes and a single-area code NPA.
Numbering plan areas and area codes of Texas with numbering plan area 281/346/713/832 highlighted. Area codes 713, 281, 832, and 346 are telephone area codes in the North American Numbering Plan (NANP) forming an overlay complex for Houston, Texas and its environs. 713 is one of the original four area codes established for Texas in 1947.
The area codes in the state of North Carolina are as follows: 252 - North Coastal Plain region in the northeast corner of the state, containing the Outer Banks (split from 919 in 1998) 910 / 472 - South Coastal Plain region in the southeast corner of the state, including Wilmington (split from 919 in 1993; 472 created as overlay beginning on ...
Interactive map of the numbering plan areas of the Commonwealth of Pennsylvania (blue). 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.
Postcode areas of Denmark indicated by the first two postcode digits. The map does not show Bornholm (37xx) Postal codes in Denmark are determined by a four digit system that was introduced in 1967. [1] The only exceptions are five special purpose 3-digit codes. The self-governing territory of Greenland is part of the Danish system (39xx). [2]
The Karnaugh map is therefore arranged in a 4 × 4 grid. The row and column indices (shown across the top and down the left side of the Karnaugh map) are ordered in Gray code rather than binary numerical order. Gray code ensures that only one variable changes between each pair of adjacent cells.
Federal Entity Area codes Aguascalientes 449, 458, 465, 495, 496 Baja California 616, 646, 653, 658, 661, 663, 664, 665, 686 Baja California Sur