Area codes / South Dakota
South Dakota area codes
South Dakota has 1 area code in service, in the Central and Mountain time zones. Pick one for a local business number your South Dakota customers recognize.
Every South Dakota area code
| Area code | Time zone | Overlaid with | In service since |
|---|---|---|---|
| 605 | Central and Mountain | None | 1947 |
Picking a South Dakota area code
605 is among the original area codes created in 1947. None of South Dakota's area codes are overlays today.
Already have a South Dakota number customers know? Move it to Onyx Phone for free, and keep answering while it moves.
Getting started
- Create a login and pick a plan. Checkout saves a card for the 7-day free trial, and nothing is charged until it ends.
- Confirm your business and its 911 address, and get a local number on the spot. Bringing your own number? You answer on a temporary one while it moves over, for free.
- Choose where calls ring, write what callers hear, invite your team, and register for texting. Then answer in the browser, the iPhone and Android apps, or a desk phone. How it works has the details.
Included on every plan
Starter is $17, Business is $29, Scale is $42 per user a month, or less billed yearly. The plan includes a business number for each user and unlimited calling and texting in the US and Canada. Every plan starts with a 7-day free trial, and moving your current number over is free.
Area code data from NANPA, file of October 24, 2026.