Phone numbers in Mason City, Iowa
Mason City has 20 phone prefixes in area code 641.
Biggest holders: CenturyLink / Lumen, T-Mobile (including Sprint), UScellular. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Local phone company 35%
- Internet / business phone carrier 10%
- Phone company 5%
Every prefix in Mason City
Search the first six digits of a number in this list. If it's here, the number started in Mason City with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 641-201 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 641-210 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 641-243 | Level 3 (Lumen) | Internet / business phone carrier | 2009 |
| 641-255 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 641-380 | CenturyLink / Lumen | Local phone company | – |
| 641-420 | Verizon Wireless | Mobile carrier | – |
| 641-421 | CenturyLink / Lumen | Local phone company | – |
| 641-422 | CenturyLink / Lumen | Local phone company | – |
| 641-423 | CenturyLink / Lumen | Local phone company | – |
| 641-424 | CenturyLink / Lumen | Local phone company | – |
| 641-425 | UScellular | Mobile carrier | – |
| 641-428 | CenturyLink / Lumen | Local phone company | 2010 |
| 641-430 | UScellular | Mobile carrier | – |
| 641-450 | Northland Communications | Phone company | 2013 |
| 641-494 | CenturyLink / Lumen | Local phone company | – |
| 641-512 | UScellular | Mobile carrier | – |
| 641-513 | Onvoy | Internet / business phone carrier | 2024 |
| 641-530 | Verizon Wireless | Mobile carrier | – |
| 641-548 | T-Mobile (including Sprint) | Mobile carrier | 2018 |
| 641-903 | T-Mobile (including Sprint) | Mobile carrier | 2005 |
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.