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The map above is clickable; click on an area code to go to the page for that code. South Dakota's area code in blue with border states shown in yellow, orange and green. Area code 605 is the telephone area code in the North American Numbering Plan for the entire U.S. state of South Dakota.
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.
Pages in category "Area codes in South Dakota" This category contains only the following page. This list may not reflect recent changes. 0–9. Area code 605
For example, the Atlantic City, New Jersey, telephone number 4-5876 was converted to AT4-5876 during the 1950s. Complete replacement of existing prefixes was necessary in the case of conflicts with another office in the state. Duplication of central office names, or an identical mapping of two different names to digits, was not uncommon.
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]
It was one of the first exchanges to switch from operators to dial telephones in 1952, and again early in switching to all push-button calling in 1965. It was sold to Dakota Cooperative Telephone Company, Inc. in 1970 but the exchange still operates with a 253 prefix and maintains equipment in Alsen.
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This is a list of places incorporated in the U.S. state of South Dakota as cities. Municipalities in South Dakota can also be incorporated as towns. South Dakota has one incorporated village, Wentworth, Lake County. [1] There are 310 municipalities.