Phone numbers in Washington, Michigan
Washington has 13 phone prefixes in area code 586.
Biggest holders: AT&T (local phone), Teleport Communications America, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 8%
- Local phone company 31%
- Internet / business phone carrier 54%
- Phone company 8%
Every prefix in Washington
Search the first six digits of a number in this list. If it's here, the number started in Washington with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 586-207 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 586-232 | Teleport Communications America | Internet / business phone carrier | 2006 |
| 586-284 | Onvoy | Internet / business phone carrier | 2021 |
| 586-371 | Onvoy | Internet / business phone carrier | 2016 |
| 586-677 | AT&T (local phone) | Local phone company | – |
| 586-697 | Teleport Communications America | Internet / business phone carrier | – |
| 586-745 | AT&T Enterprises | Phone company | 2006 |
| 586-781 | AT&T (local phone) | Local phone company | – |
| 586-786 | AT&T (local phone) | Local phone company | – |
| 586-816 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 586-926 | TON80 Communications | Internet / business phone carrier | 2022 |
| 586-935 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 586-992 | AT&T (local phone) | Local phone company | 2001 |
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.