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Home › Area codes › South Dakota

US area codes

South Dakota area codes

A checked list of 1 in-service geographic area code in South Dakota, with their dates, overlay partners and dialing rules.

Last checked 14 October 2026

Area codes across North America

Codes in service in South Dakota

South Dakota has one geographic area code in service: 605, dated 1947 in NANPA's database.1 605 is on Central and Mountain time.

Area codeNANPA locationNPA in-service dateIn-service overlay peersTime zoneLocal calls within the code
605SD1947None listedCentral and Mountain10 digits

Scroll the table sideways to see every column. Sources: NANPA (14 October 2026 file).

History and overlays in South Dakota

NANPA lists no in-service overlay for 605.1

Dialing in South Dakota

Local calls within 605 are recorded as 10 digits. Local calls from 605 to other area codes are recorded as 10 digits.1

Neighbours of South Dakota

Regions that border South Dakota:

  • Iowa: 5 codes (319, 515, 563, 641, ...)
  • Minnesota: 8 codes (218, 320, 507, 612, ...)
  • Montana: 1 code (406)
  • Nebraska: 3 codes (308, 402, 531)

Rules that apply to every region are on the area-code reference.

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Further reading

Longer research pieces on this topic, each with its own source list and a downloadable PDF.

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A 2026 guide to phone number porting times, from 2.5-hour mobile transfers to six-week complex ports, with U.S., Canada, U.K. and Australia rules.
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What Phone Number to Use on Google Business Profile
A 2026 U.S. guide to choosing a Google Business Profile primary number, evaluating tracking versus a stable main line, checking account ownership, and testing calls before and after an edit.

Articles on this topic

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How to Get a Business Phone Number: Options & Costs
Learn how to get a business phone number in 2026, compare eight option types and real team pricing, and check porting, identity, toll-free and emergency-calling requirements.
Article · 25 min read
Why Your Business Number Shows as Spam Likely
A 2026 US diagnostic guide to Spam Likely labels, covering CNAM, STIR/SHAKEN, carrier testing, spoofing, and free redress routes.
Article · 23 min read
How to Check Phone Number History for a New Business
Learn how to check phone number history in 2026 before publishing a new business number: verify public listings, test calls, compare provider remedies and decide whether to accept or replace it.
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Business Call Forwarding to Cell Phone: Caller ID and Voicemail
A 2026 test guide for business calls forwarded to staff mobiles: identify the incoming number, prevent personal voicemail pickup, verify callbacks, and compare routing options.

Sources

Every regulatory and pricing claim on this page links to the primary source it came from. Figures were checked on the date shown at the top of the page; rules and prices change, so verify before relying on one.

  1. NANPA, NPA Database CSV, file dated 14 October 2026; US geographic codes, location, dates, overlay complexes, dialing plan and time zone. Retrieved 14 Oct 2026
    https://reports.nanpa.com/public/npa_report.csv

Keep reading

Reference
How overlays work
Why two codes can serve the same area and what ten-digit dialling changes.
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