Wikipedia

Area code 605

Area code 605 is the telephone area code in the North American Numbering Plan (NANP) 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.

Area code 406Area code 701Area code 320Area code 218Area code 507Area code 712Area code 402Area code 308Area code 307
South Dakota's single numbering plan area and area code

Before October 2021, area code 605 had telephone numbers assigned for the central office code 988. In 2020, 988 was designated nationwide as a dialing code for the National Suicide Prevention Lifeline, which created a conflict for exchanges that permit seven-digit dialing. Area code 605 was therefore scheduled to transition to ten-digit dialing by October 24, 2021.[1]

Projections of 2023 suggest that South Dakota's numbering plan area will require relief action to avoid exhaustion of central office prefixes by late 2026,[2]

Service area

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The numbering plan area includes the following communities, which are serviced by the listed central office prefixes.

See also

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References

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  1. ^ "Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline)" (PDF). North American Numbering Plan Administrator. January 8, 2021. Retrieved March 9, 2021.
  2. ^ 2023-1 NRUF and NPA Exhaust Analysis (PDF) (Report). East Brunswick, New Jersey: North American Numbering Plan Administrator. April 2023. p. 2. Retrieved June 30, 2023.
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South Dakota area codes: 605
North: 701
West: 307, 406 605 East: 320, 507/924, 712
South: 402/531, 308
North Dakota area codes: 701
Iowa area codes: 319, 515, 563, 641, 712
Minnesota area codes: 218, 320, 507/924, 612, 651, 763, 952
Montana area codes: 406
Wyoming area codes: 307
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