Phone numbers in Gresham, Oregon
Gresham has 32 phone prefixes in area codes 503, 971.
Biggest holders: Ziply Fiber, Allstream, Bandwidth. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 12%
- Local phone company 41%
- Internet / business phone carrier 47%
Every prefix in Gresham
Search the first six digits of a number in this list. If it's here, the number started in Gresham with the carrier shown. If it isn't, check the Oregon page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 503-328 | Allstream | Internet / business phone carrier | – |
| 503-405 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 503-465 | Ziply Fiber | Local phone company | – |
| 503-489 | Allstream | Internet / business phone carrier | – |
| 503-491 | Ziply Fiber | Local phone company | – |
| 503-492 | Ziply Fiber | Local phone company | – |
| 503-512 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 503-573 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 503-618 | Ziply Fiber | Local phone company | – |
| 503-660 | Ziply Fiber | Local phone company | – |
| 503-661 | Ziply Fiber | Local phone company | – |
| 503-663 | Ziply Fiber | Local phone company | – |
| 503-665 | Ziply Fiber | Local phone company | – |
| 503-666 | Ziply Fiber | Local phone company | – |
| 503-667 | Ziply Fiber | Local phone company | – |
| 503-669 | Ziply Fiber | Local phone company | – |
| 503-674 | Ziply Fiber | Local phone company | – |
| 503-676 | Teleport Communications America | Internet / business phone carrier | – |
| 503-766 | Teleport Communications America | Internet / business phone carrier | – |
| 503-907 | Allstream | Internet / business phone carrier | – |
| 503-912 | Comcast | Internet / business phone carrier | 2006 |
| 503-918 | Onvoy | Internet / business phone carrier | 2026 |
| 971-220 | Bandwidth | Internet / business phone carrier | – |
| 971-231 | Bandwidth | Internet / business phone carrier | – |
| 971-274 | CenturyLink / Lumen | Local phone company | 2013 |
| 971-292 | MetroPCS (T-Mobile) | Mobile carrier | 2017 |
| 971-293 | AT&T Mobility | Mobile carrier | 2017 |
| 971-431 | Bandwidth | Internet / business phone carrier | 2022 |
| 971-436 | Commio | Internet / business phone carrier | 2022 |
| 971-502 | AT&T Mobility | Mobile carrier | 2024 |
| 971-531 | AT&T Mobility | Mobile carrier | 2026 |
| 971-571 | Onvoy | Internet / business phone carrier | 2020 |
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.