Phone numbers in Madison, South Dakota
Madison has 8 phone prefixes in area code 605.
Biggest holders: CenturyLink / Lumen, Verizon Wireless, Bandwidth. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 38%
- Local phone company 38%
- Internet / business phone carrier 12%
- Phone company 12%
Every prefix in Madison
Search the first six digits of a number in this list. If it's here, the number started in Madison with the carrier shown. If it isn't, check the South Dakota page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 605-256 | CenturyLink / Lumen | Local phone company | – |
| 605-270 | Verizon Wireless | Mobile carrier | – |
| 605-291 | Verizon Wireless | Mobile carrier | – |
| 605-427 | Bandwidth | Internet / business phone carrier | – |
| 605-480 | AT&T Mobility | Mobile carrier | – |
| 605-556 | Midcontinent Communications | Phone company | 2001 |
| 605-621 | Interstate Telecommunications Cooperative | Local phone company | 2023 |
| 605-636 | CenturyLink / Lumen | Local phone company | – |
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.