Phone numbers in Fairfield, Iowa
Fairfield has 9 phone prefixes in area code 641.
Biggest holders: Windstream Iowa Communications, Inc. - Systems, Local Telephone Data Services, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 33%
- Local phone company 44%
- Internet / business phone carrier 11%
- Phone company 11%
Every prefix in Fairfield
Search the first six digits of a number in this list. If it's here, the number started in Fairfield with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 641-209 | Local Telephone Data Services | Phone company | – |
| 641-233 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 641-451 | Verizon Wireless | Mobile carrier | 2003 |
| 641-469 | Windstream Iowa Communications, Inc. - Systems | Local phone company | – |
| 641-470 | Windstream Iowa Communications, Inc. - Systems | Local phone company | – |
| 641-472 | Windstream Iowa Communications, Inc. - Systems | Local phone company | – |
| 641-560 | Onvoy | Internet / business phone carrier | 2024 |
| 641-819 | Windstream Iowa Communications, Inc. - Systems | Local phone company | 2015 |
| 641-919 | UScellular | 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.