US numbering directory
South Dakota Area Codes
Compare 1 in-service area codes assigned to South Dakota. Explore each code’s introduction date, overlays, possible time zones, and public prefix records.
South Dakota numbering at a glance
- In-service area codes
- 1
- Time-zone labels in NANPA data
- Central, Mountain
- Listed in-service or assigned prefixes
- 743 · source dated 2026-09-29
These are numbering assignments. The counts do not represent active phone numbers, current carriers, or a caller’s physical location.
Compare area codes in South Dakota
| Code | Introduced | Other codes in overlay | Time zones | Listed prefixes |
|---|---|---|---|---|
| 605 | 01-Jan-1947 | None listed | Central, Mountain | 743 |
Source: NANPA NPA database, dated 2026-09-28. Prefix counts: NANPA US assignment report. View official area-code maps.
Find a number in South Dakota
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