Phone numbers in Tiffin, Iowa
Tiffin has 3 phone prefixes in area code 319.
Biggest holders: South Slope Cooperative Telephone, Windstream Iowa Communications, Inc. - North, TON80 Communications. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 67%
- Internet / business phone carrier 33%
Every prefix in Tiffin
Search the first six digits of a number in this list. If it's here, the number started in Tiffin with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 319-545 | South Slope Cooperative Telephone | Local phone company | – |
| 319-645 | Windstream Iowa Communications, Inc. - North | Local phone company | – |
| 319-992 | TON80 Communications | Internet / business phone carrier | 2022 |
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.