Phone numbers in Hamburg, Iowa
Hamburg has 3 phone prefixes in area code 712.
Biggest holders: CenturyLink / Lumen, UScellular. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 33%
- Local phone company 67%
Every prefix in Hamburg
Search the first six digits of a number in this list. If it's here, the number started in Hamburg with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 712-350 | UScellular | Mobile carrier | – |
| 712-382 | CenturyLink / Lumen | Local phone company | – |
| 712-591 | CenturyLink / Lumen | Local phone company | 2019 |
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.