South Dakota area codes
- Area code in
- 1
- State
- South Dakota
- South Dakota is served by a single area code, 605, in service since 1947.
- Updated 8 October 2026
Now in South Dakota
Central Time · UTC−6, UTC−5 in summer
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Central Time
Typical business hours, 9 to 5 Monday to Friday.
Typical business hours, 9 to 5 Monday to Friday, shown as the blue arc. A guide to when a real South Dakota office is likely to answer. It says nothing about who called you.
01
The South Dakota area code
South Dakota uses a single area code, 605, and has done since 1947. Every South Dakota number starts with it.
02
Spam call reports in South Dakota
These South Dakota area codes drew the most reports to the FTC in the 30 days to 8 October 2026. The figures describe numbers displaying each code, which caller ID spoofing can fake.
Most reported South Dakota area codes · last 30 days
| # | Code | Primary city | Reports (30 days) |
|---|---|---|---|
| 1 | 605 | Sioux Falls | 226 |
A number listed here may itself be a spoofing victim rather than the caller. These are unverified consumer reports.
Source: FTC Do Not Call Reported Calls Data, unverified consumer reports, retrieved 8 October 2026. Request a correction. Month-over-month figures appear once two complete 30-day windows exist.
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03
Questions
How many area codes does South Dakota have?
South Dakota has 1 area code: 605.
What is the main area code for Sioux Falls?
The main area code for Sioux Falls is 605.
Which South Dakota area code is oldest?
Area code 605 is the oldest in South Dakota, in service since 1947.
Do I need to dial ten digits in South Dakota?
Not necessarily. South Dakota has no overlay codes, so seven-digit local dialling may still work in parts of the state.
Which South Dakota area code gets the most spam calls?
Area code 605 (Sioux Falls) drew the most reports of any South Dakota code in the 30 days to 8 October 2026, with 226 numbers reported.
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