Phone numbers in Monroe, Michigan
Monroe has 40 phone prefixes in area code 734.
Biggest holders: AT&T (local phone), T-Mobile (including Sprint), Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 40%
- Local phone company 18%
- Internet / business phone carrier 35%
- Paging service 8%
Every prefix in Monroe
Search the first six digits of a number in this list. If it's here, the number started in Monroe with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 734-227 | Spok | Paging service | – |
| 734-230 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 734-240 | AT&T (local phone) | Local phone company | – |
| 734-241 | AT&T (local phone) | Local phone company | – |
| 734-242 | AT&T (local phone) | Local phone company | – |
| 734-243 | AT&T (local phone) | Local phone company | – |
| 734-244 | Teleport Communications America | Internet / business phone carrier | – |
| 734-264 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 734-265 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 734-289 | AT&T (local phone) | Local phone company | – |
| 734-297 | American Messaging Services | Paging service | – |
| 734-305 | American Messaging Services | Paging service | – |
| 734-322 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 734-342 | Interactive Services Network | Internet / business phone carrier | – |
| 734-344 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 734-349 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 734-384 | AT&T (local phone) | Local phone company | – |
| 734-410 | MetroPCS (T-Mobile) | Mobile carrier | 2018 |
| 734-430 | Bandwidth | Internet / business phone carrier | 2010 |
| 734-457 | AT&T (local phone) | Local phone company | – |
| 734-497 | T-Mobile (including Sprint) | Mobile carrier | – |
| 734-581 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 734-597 | Verizon Wireless | Mobile carrier | 2021 |
| 734-598 | Onvoy | Internet / business phone carrier | 2023 |
| 734-621 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 734-625 | Verizon Wireless | Mobile carrier | – |
| 734-636 | MetroPCS (T-Mobile) | Mobile carrier | 2011 |
| 734-639 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 734-652 | T-Mobile (including Sprint) | Mobile carrier | – |
| 734-682 | Onvoy | Internet / business phone carrier | – |
| 734-687 | Interactive Services Network | Internet / business phone carrier | – |
| 734-693 | AT&T Mobility | Mobile carrier | – |
| 734-731 | AT&T Mobility | Mobile carrier | 2001 |
| 734-735 | Verizon Wireless | Mobile carrier | – |
| 734-755 | Verizon Wireless | Mobile carrier | – |
| 734-770 | Verizon Wireless | Mobile carrier | 2002 |
| 734-777 | T-Mobile (including Sprint) | Mobile carrier | – |
| 734-790 | Verizon Wireless | Mobile carrier | – |
| 734-819 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 734-915 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
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.