─────── § 04. NPA RECORD · 605 · FOLIO 0407 OF 0801 ──────────────
605
United States NPA Record
Area code 605 is the sole area code for the entire state of South Dakota, established in 1947 as part of the original North American Numbering Plan.
Area code 605 is the sole area code for the entire state of South Dakota, established in 1947 as part of the original North American Numbering Plan.
First record · 1947
§ 04.05Event Summary
introduced · 1mandatory dialing · 1permissive dialing · 1relief planned · 1
§ 04.06
Documentary Record · 4 events
CHRONOLOGICAL ORDER
1947-01-01
introduced
NPA 605 designated for South Dakota
Area code 605 was designated for the entire state of South Dakota in 1947 as part of the original North American Numbering Plan.
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2021-04-24
permissive dialing
Permissive ten-digit dialing begins in NPA 605
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2021-10-24
mandatory dialing
Mandatory ten-digit dialing implemented in NPA 605
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2023-01-01
relief planned
Projected need for relief planning in NPA 605
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