Phone numbers in Webster, South Dakota
Webster has 4 phone prefixes in area code 605.
Biggest holders: AT&T Mobility, Interstate Telecom Coop, Midcontinent Communications. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Phone company 50%
Every prefix in Webster
Search the first six digits of a number in this list. If it's here, the number started in Webster with the carrier shown. If it isn't, check the South Dakota page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 605-265 | AT&T Mobility | Mobile carrier | 2003 |
| 605-345 | Interstate Telecom Coop | Phone company | – |
| 605-588 | Midcontinent Communications | Phone company | 2003 |
| 605-590 | Verizon Wireless | Mobile carrier | 2008 |
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.