Midwest region · Central Time
South Dakota Area Codes
All 1 area code serving South Dakota, the cities each one covers, and which are overlays. South Dakota is served by 1 area code in the Central Time zone.
Last updated June 5, 2026
Full list
Every South Dakota area code
South Dakota is served by 1 area code in the Central Time zone. It is a single-code state, so seven-digit local dialing may still work in many places. Central in the east (Sioux Falls); west-river South Dakota is Mountain.
| Code | Main city | Type | Status |
|---|---|---|---|
| 605 | Sioux Falls | Geographic | In service |
Area codes and dialing in South Dakota
South Dakota is one of the few US states still covered by a single area code, 605. Because there's no overlap, many local calls can still be completed with seven digits, although dialing the full 10-digit number always works and is the safer habit. 605 serves Sioux Falls and the rest of the state, all in the Central Time zone.
If South Dakota ever exhausts its supply of numbers, regulators would almost certainly add an overlay rather than split the state — the modern approach that lets everyone keep their existing number. For now, every South Dakota number shares the 605 code. Learn the background in how area codes work.
Browse South Dakota another way
Explore by Midwest region, by time zone, or jump to the city index. You can also see the complete numeric list of every US area code.
Quick answers
South Dakota area code FAQ
How many area codes does South Dakota have?
South Dakota currently has 1 area code: 605.
What is the main area code for South Dakota?
The busiest metro in South Dakota is served by the 605 code. Major cities include Sioux Falls.
Does South Dakota require 10-digit dialing?
Much of the state still permits 7-digit local calls, though 10-digit dialing always works. Ten-digit dialing is the national standard.