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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.
Map of LATAs in the US. Local access and transport area (LATA) is a term used in U.S. telecommunications regulation.It represents a geographical area of the United States under the terms of the Modification of Final Judgment (MFJ) entered by the United States District Court for the District of Columbia in Civil Action number 82-0192 or any other geographic area designated as a LATA in the ...
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. Original North American area codes
The prefixes in the Americas start with one of 1,2,5. All countries in the Americas use codes that start with "5", with the exception of the countries of the North American Numbering Plan, such as Canada and the United States, which use country code 1, and Greenland and Aruba with country codes starting with the digit "2", which mostly is used by countries in Africa.
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.
Please let me know on my talk page if you have any problem with these standards. Current maps and their projections: File:USA telephone area code map - New Jersey.svg - EPSG:3968 NAD83 / Virginia Lambert; File:USA telephone area code map - West Virginia.svg - EPSG:3968 NAD83 / Virginia Lambert
Since this change went into full effect on July 8, 2017, telephone companies have been able to assign any available 213 numbers in the former 323 area and vice versa, and customers have been required to dial the area code for all calls. [5] [6] This change returned 213 to some areas that had used it for more than half a century prior to 1998. [3]
A map of Utah with the 801 and 385 area code overlay highlighted in red The original 801 area code, as shown on a 1952 map. Area codes 801 and 385 are telephone area codes in the North American Numbering Plan (NANP) serving Salt Lake City and the four surrounding counties of the Wasatch Front in north-central Utah .