Phone numbers in Dimondale, Michigan
Dimondale has 12 phone prefixes in area code 517.
Biggest holders: MCImetro (Verizon Business), Onvoy, AT&T Enterprises. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 8%
- Local phone company 8%
- Internet / business phone carrier 67%
- Phone company 17%
Every prefix in Dimondale
Search the first six digits of a number in this list. If it's here, the number started in Dimondale with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 517-235 | AT&T Enterprises | Phone company | 2010 |
| 517-236 | Verizon Wireless | Mobile carrier | – |
| 517-308 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 517-345 | MCImetro (Verizon Business) | Internet / business phone carrier | 2005 |
| 517-408 | Comcast | Internet / business phone carrier | 2007 |
| 517-550 | Onvoy | Internet / business phone carrier | 2018 |
| 517-600 | MCImetro (Verizon Business) | Internet / business phone carrier | 2005 |
| 517-616 | Onvoy | Internet / business phone carrier | 2008 |
| 517-646 | AT&T (local phone) | Local phone company | – |
| 517-868 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 517-912 | Acd Telecom | Phone company | 2001 |
| 517-966 | MCImetro (Verizon Business) | Internet / business phone carrier | 2006 |
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.