Phone numbers in Highmore, South Dakota
Highmore has 4 phone prefixes in area code 605.
Biggest holders: Verizon Wireless, AT&T Mobility, Venture Communications Cooperative. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 75%
- Local phone company 25%
Every prefix in Highmore
Search the first six digits of a number in this list. If it's here, the number started in Highmore with the carrier shown. If it isn't, check the South Dakota page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 605-478 | AT&T Mobility | Mobile carrier | 2005 |
| 605-852 | Venture Communications Cooperative | Local phone company | – |
| 605-870 | Verizon Wireless | Mobile carrier | – |
| 605-871 | Verizon Wireless | Mobile carrier | – |
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.