Area code 605: where it is and who calls from it
Area code 605 is in South Dakota.
South Dakota (all)
| Where | South Dakota |
|---|---|
| Time zone | Central and Mountain Time ยท local time |
| In service since | 1947 |
| Overlay | No |
| Prefixes assigned | 745 of 792 possible (94%) |
Where 605 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 605, with how many prefixes each has.
Plus 209 smaller rate centers.
Who holds 605 numbers
- Mobile carrier 29%
- Local phone company 35%
- Internet / business phone carrier 11%
- Phone company 25%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| CenturyLink / Lumen | Local phone company | 106 | 14% |
| Verizon Wireless | Mobile carrier | 100 | 13% |
| AT&T Mobility | Mobile carrier | 81 | 11% |
| Midcontinent Communications | Phone company | 34 | 5% |
| Bluepeak | Phone company | 32 | 4% |
| Venture Communications Cooperative | Local phone company | 30 | 4% |
| Interstate Telecom Coop | Phone company | 28 | 4% |
| Golden West Telecomm | Local phone company | 27 | 4% |
| Golden West Telecommunications | Local phone company | 22 | 3% |
| T-Mobile (including Sprint) | Mobile carrier | 21 | 3% |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number.
States served: South Dakota.
Got a call from 605?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 605 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.