Phone numbers in Sergeant Bluff, Iowa
Sergeant Bluff has 13 phone prefixes in area code 712.
Biggest holders: Northwest Iowa Telephone, Level 3 (Lumen), AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 8%
- Internet / business phone carrier 8%
- Phone company 85%
Every prefix in Sergeant Bluff
Search the first six digits of a number in this list. If it's here, the number started in Sergeant Bluff with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 712-228 | Northwest Iowa Telephone | Phone company | 2002 |
| 712-237 | Northwest Iowa Telephone | Phone company | – |
| 712-247 | Northwest Iowa Telephone | Phone company | 2001 |
| 712-257 | Northwest Iowa Telephone | Phone company | – |
| 712-271 | Northwest Iowa Telephone | Phone company | – |
| 712-285 | Northwest Iowa Telephone | Phone company | 2003 |
| 712-823 | Level 3 (Lumen) | Internet / business phone carrier | 2008 |
| 712-923 | Northwest Iowa Telephone | Phone company | 2001 |
| 712-924 | Northwest Iowa Telephone | Phone company | 2002 |
| 712-934 | Northwest Iowa Telephone | Phone company | 2002 |
| 712-941 | AT&T Mobility | Mobile carrier | – |
| 712-942 | Northwest Iowa Telephone | Phone company | 2002 |
| 712-943 | Northwest Iowa Telephone | Phone company | – |
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.