Phone numbers in Onida, South Dakota
Onida has 3 phone prefixes in area code 605.
Biggest holders: Venture Communications Cooperative. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 100%
Every prefix in Onida
Search the first six digits of a number in this list. If it's here, the number started in Onida with the carrier shown. If it isn't, check the South Dakota page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 605-258 | Venture Communications Cooperative | Local phone company | – |
| 605-264 | Venture Communications Cooperative | Local phone company | – |
| 605-973 | Venture Communications Cooperative | 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.