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Area code 605 is the telephone area code in the North American Numbering Plan for the entire U.S. state of South Dakota. The numbering plan area was designated in 1947, when the American Telephone and Telegraph Company (AT&T) devised a comprehensive telephone numbering plan for the United States and Canada.
A telephone prefix is the first set of digits after the country, and area codes of a telephone number. In the North American Numbering Plan countries (country code 1), it is the first three digits of a seven-digit local phone number, the second three digits of the 3-3-4 scheme. In other countries, both the prefix and the number may have ...
Telephone dial number card of c.1948 with the local telephone number 4-5876 in Atlantic City, NJ, using the central office prefix 4, later converted to AT4 Face of a 1939 rotary telephone dial with the telephone number LA-2697, which includes the first two letters of Lakewood, New Jersey, as the central office prefix, later converted to LA6.
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
For South Dakota-related articles needing a photograph, use {{Image requested|in=South Dakota}} in the talk page, which adds the article needing a photo to Category:Wikipedia requested photographs in South Dakota.
South Dakota is named after the Dakota Sioux tribe, which comprises a large portion of the population — with nine reservations currently in the state — and has historically dominated the territory. [10] South Dakota is the 17th-largest by area, but the fifth-least populous, and the fifth-least densely populated of the 50 United States.
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Midco (known as Midcontinent Communications until 2016) is a regional cable provider, providing a triple play service of cable television, Internet and telephone service for both North Dakota and South Dakota, along with much of Minnesota, and several communities in Kansas and Wisconsin. [2]