Phone numbers in Portland, Michigan
Portland has 7 phone prefixes in area code 517.
Biggest holders: AT&T Mobility, Verizon Wireless, AT&T (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 29%
- Local phone company 14%
- Internet / business phone carrier 29%
- Phone company 29%
Every prefix in Portland
Search the first six digits of a number in this list. If it's here, the number started in Portland with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 517-218 | AT&T Mobility | Mobile carrier | 2023 |
| 517-526 | Verizon Wireless | Mobile carrier | – |
| 517-647 | AT&T (local phone) | Local phone company | – |
| 517-732 | 123.NET | Phone company | 2002 |
| 517-743 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 517-848 | Interactive Services Network | Internet / business phone carrier | 2001 |
| 517-994 | Acd Telecom | 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.