Phone numbers in Lake Preston, South Dakota
Lake Preston has 5 phone prefixes in area code 605.
Biggest holders: AT&T Mobility, Valley Communications, Onvoy. 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 60%
Every prefix in Lake Preston
Search the first six digits of a number in this list. If it's here, the number started in Lake Preston with the carrier shown. If it isn't, check the South Dakota page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 605-203 | AT&T Mobility | Mobile carrier | 2002 |
| 605-525 | Valley Communications | Internet / business phone carrier | 2019 |
| 605-620 | Onvoy | Internet / business phone carrier | – |
| 605-632 | Mcc Telephony Of The Mid-west | Internet / business phone carrier | 2010 |
| 605-847 | 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.