Phone numbers in Richmond, Michigan
Richmond has 8 phone prefixes in area code 586.
Biggest holders: Onvoy, Cynergycomm.net, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 12%
- Local phone company 12%
- Internet / business phone carrier 62%
- Phone company 12%
Every prefix in Richmond
Search the first six digits of a number in this list. If it's here, the number started in Richmond with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 586-248 | Cynergycomm.net | Phone company | 2006 |
| 586-290 | T-Mobile (including Sprint) | Mobile carrier | 2019 |
| 586-317 | Interactive Services Network | Internet / business phone carrier | – |
| 586-326 | Onvoy | Internet / business phone carrier | 2021 |
| 586-355 | Onvoy | Internet / business phone carrier | 2021 |
| 586-430 | Teleport Communications America | Internet / business phone carrier | – |
| 586-636 | Peerless Network Of Michigan | Internet / business phone carrier | 2014 |
| 586-727 | Frontier | Local 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.