Phone numbers in Chamberlain, South Dakota
Chamberlain has 5 phone prefixes in area code 605.
Biggest holders: Midstate Telecom, AT&T Mobility, CenturyLink / Lumen. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 20%
- Local phone company 20%
- Internet / business phone carrier 20%
- Phone company 40%
Every prefix in Chamberlain
Search the first six digits of a number in this list. If it's here, the number started in Chamberlain with the carrier shown. If it isn't, check the South Dakota page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 605-234 | Midstate Telecom | Phone company | 2001 |
| 605-730 | AT&T Mobility | Mobile carrier | – |
| 605-734 | CenturyLink / Lumen | Local phone company | – |
| 605-815 | Airus | Phone company | 2019 |
| 605-888 | Onvoy | Internet / business phone carrier | 2012 |
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. Source: NANPA central office code records, 2026-10-10.