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  1. Area code 506 was expected to face numbering exhaustion in 2020, and was to be overlaid with area code 428, beginning November 21, 2020, with permissive ten-digit dialing to start in May 2020. Later, the projected exhaust date was delayed to April 2023 and the implementation date was postponed to April 23, 2022. [2]

  2. 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 North American area code 605 is the telephone area code serving the entire state of South Dakota , and is one of the area codes that was created in 1947.

  3. The area to which an area code is officially assigned is known as a Numbering Plan Area (NPA). An area code is part of a telephone number in the United States, Canada, and the Caribbean. It is the part of the telephone number after the county code. For example, in the number 1-562-555-5555, the 1 is the country code (for the United States), and ...

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