Phone numbers in Dupree, South Dakota
Dupree has 4 phone prefixes in area code 605.
Biggest holders: AT&T Mobility, Cheyenne River Sioux Tribal Tel. Authority. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Phone company 50%
Every prefix in Dupree
Search the first six digits of a number in this list. If it's here, the number started in Dupree with the carrier shown. If it isn't, check the South Dakota page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 605-200 | AT&T Mobility | Mobile carrier | 2003 |
| 605-365 | Cheyenne River Sioux Tribal Tel. Authority | Phone company | – |
| 605-538 | Cheyenne River Sioux Tribal Tel. Authority | Phone company | – |
| 605-821 | AT&T Mobility | Mobile carrier | 2010 |
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.