South Dakota Area Codes
Directory of all 1 telephone area codes assigned to South Dakota.
South Dakota phone numbers are served by 1 area code operating in the Central / Mountain timezone.10-digit or 7-digit local dialing applies depending on the exact number. No area codes in South Dakota are currently flagged as high-risk scams.
Most populated prefix: area code 605 (South Dakota)
All Area Codes in South Dakota
Major Cities Served by South Dakota Area Codes
The most populous urban centers and census places covered by South Dakota's area codes, ranked by population.
South Dakota Area Code FAQs
Quick answers to common questions about South Dakota telephone area codes.
How many area codes does South Dakota have?
South Dakota has 1 area codes: 605.
What timezone do South Dakota area codes use?
South Dakota area codes operate in the Central / Mountain timezone.
What is the most populated area code in South Dakota?
Area code 605 is the most populous prefix in South Dakota based on covered city population.
Does South Dakota use overlay area codes?
South Dakota currently has no overlay code pairs listed in our directory.
Are there scam area codes in South Dakota?
South Dakota has no area codes currently flagged as high-risk scams.
About South Dakota Area Codes & Phone Dialing Rules
When placing calls within South Dakota, ten-digit dialing (area code + 7-digit telephone number) is required in overlay regions where multiple area codes serve the same geographic boundaries.