Phone numbers in Fort Madison, Iowa
Fort Madison has 11 phone prefixes in area code 319.
Biggest holders: Verizon Wireless, Onvoy, CenturyLink / Lumen. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 55%
- Local phone company 18%
- Internet / business phone carrier 18%
- Phone company 9%
Every prefix in Fort Madison
Search the first six digits of a number in this list. If it's here, the number started in Fort Madison with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 319-246 | Onvoy | Internet / business phone carrier | – |
| 319-250 | Onvoy | Internet / business phone carrier | 2009 |
| 319-308 | Verizon Wireless | Mobile carrier | 2020 |
| 319-316 | Local Telephone Data Services | Phone company | – |
| 319-371 | Verizon Wireless | Mobile carrier | – |
| 319-372 | CenturyLink / Lumen | Local phone company | – |
| 319-376 | CenturyLink / Lumen | Local phone company | – |
| 319-417 | Verizon Wireless | Mobile carrier | 2023 |
| 319-470 | UScellular | Mobile carrier | – |
| 319-561 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 319-669 | AT&T Mobility | Mobile carrier | 2001 |
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.