Phone numbers in Watertown, South Dakota
Watertown has 17 phone prefixes in area code 605.
Biggest holders: Verizon Wireless, CenturyLink / Lumen, AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 47%
- Local phone company 18%
- Internet / business phone carrier 18%
- Phone company 18%
Every prefix in Watertown
Search the first six digits of a number in this list. If it's here, the number started in Watertown with the carrier shown. If it isn't, check the South Dakota page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 605-237 | Verizon Wireless | Mobile carrier | – |
| 605-303 | Verizon Wireless | Mobile carrier | 2020 |
| 605-520 | AT&T Mobility | Mobile carrier | – |
| 605-602 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
| 605-657 | Onvoy | Internet / business phone carrier | 2020 |
| 605-753 | Bluepeak | Phone company | – |
| 605-818 | Rc Communications | Phone company | 2006 |
| 605-868 | T-Mobile (including Sprint) | Mobile carrier | – |
| 605-878 | Midcontinent Communications | Phone company | 2005 |
| 605-880 | Verizon Wireless | Mobile carrier | – |
| 605-881 | AT&T Mobility | Mobile carrier | – |
| 605-882 | CenturyLink / Lumen | Local phone company | – |
| 605-884 | CenturyLink / Lumen | Local phone company | – |
| 605-886 | CenturyLink / Lumen | Local phone company | – |
| 605-902 | Bandwidth | Internet / business phone carrier | 2022 |
| 605-954 | Bandwidth | Internet / business phone carrier | – |
| 605-956 | 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.