South Dakota area codes
South Dakota has used a single area code, 605, since 1947. Every South Dakota number starts with it, so the code tells you the state and nothing more specific.
Updated 28 July 2026
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.
South Dakota area code map
South Dakota sits in the Central Time zone.
Spam call reports in South Dakota
These South Dakota area codes drew the most reports to the FTC in the 30 days to 28 July 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 |
|---|---|---|
| 605 | Sioux Falls | 233 |
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 28 July 2026. Request a correction.
Calls from your South Dakota numbers not landing?
Get a local South Dakota phone number
The South Dakota area code, live in minutes.
Browse South Dakota numbersQuestions
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 28 July 2026, with 233 numbers reported.