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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.
St. Louis, Missouri (communities such as, but not limited to, St. Louis, Overland, Bridgeton, Florissant, Webster Groves, Creve Coeur, Kirkwood and Sappington) Initial overlay area code plan was announced October 24, 2000. New 557 area code was announced in February 2022 and went into effect August 12, 2022.
The second area code, 202, was assigned to the District of Columbia. The allocation of area codes was readjusted as early as 1948 before the implementation of the plan commenced. For example, the Indiana numbering plan area 317 was divided, which essentially provided a larger numbering pool in the Indiana suburbs of Chicago (area code 219).
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. The state of California was divided into three numbering plan areas (NPAs) with distinct area codes : 213 , 415 , and 916 , for the southern, central, and northern parts of the ...
Region covered by area code 256/938 in Alabama. Area codes 256 and 938 are telephone area codes in the North American Numbering Plan (NANP) for North Alabama, as well as some eastern portions of the state. The two area codes form an overlay plan for the same numbering plan area. Area code 256 was created in 1998, and 938 was added in 2010.
Area codes 402 and 531 are telephone area codes in the North American Numbering Plan (NANP) for the eastern part of the U.S. state of Nebraska. Area code 402 was one of the original North American area codes created in 1947, when it was assigned to the entire state.
Area codes were assigned based on the volume of traffic and the speed of dialing the code on a rotary electromechanical dial phone, so that the higher the volume of traffic, the less time it took to dial the area code. Area code 212 was the quickest, followed by 213 (Los Angeles) and 312 (Chicago), etc., all the way to 919 (North Carolina).
Area code 519 was the initial code of the numbering plan area (NPA). It was created in 1953 from the western portion of area code 416 and the southwestern portion of 613. The numbering plan area is mostly bounded by area code 905, except for Simcoe County which is bordered by 705. Area code 226 was added to the numbering plan area in 2006, and ...