GRESHAM prefixes in area code 503
NANPA records 22 assigned NXX blocks to rate center GRESHAM in area code 503, 2.8% of the 784 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 8 holders hold those blocks, the largest being ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER (12), ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM (3), TELEPORT COMMUNICATIONS AMERICA, LLC - OR (2). The earliest assignment on record here is 2006-10-05 and the most recent 2026-09-03. 13 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 402, 715, 971 – overlay codes cover the same geography, so a rate center is served by all of them.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 503-328 | Allstream ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | – | yes | yes |
| 503-405 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 503-465 | Ziply Fiber ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | – | yes | yes |
| 503-489 | Allstream ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | – | yes | yes |
| 503-491 | Ziply Fiber ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | – | no | yes |
| 503-492 | Ziply Fiber ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | – | no | yes |
| 503-512 | Lumen LEVEL 3 TELECOM OF OREGON, LLC - OR | – | yes | yes |
| 503-573 | Lumen LEVEL 3 COMMUNICATIONS, LLC - OR | – | yes | yes |
| 503-618 | Ziply Fiber ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | – | no | yes |
| 503-660 | Ziply Fiber ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | – | yes | yes |
| 503-661 | Ziply Fiber ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | – | no | yes |
| 503-663 | Ziply Fiber ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | – | yes | yes |
| 503-665 | Ziply Fiber ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | – | no | yes |
| 503-666 | Ziply Fiber ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | – | no | yes |
| 503-667 | Ziply Fiber ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | – | no | yes |
| 503-669 | Ziply Fiber ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | – | no | yes |
| 503-674 | Ziply Fiber ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | – | no | yes |
| 503-676 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - OR | – | yes | yes |
| 503-766 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - OR | – | yes | yes |
| 503-907 | Allstream ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | – | yes | yes |
| 503-912 | Comcast COMCAST IP PHONE, LLC | 2006-10-05 | yes | yes |
| 503-918 | Onvoy ONVOY, LLC - OR | 2026-09-03 | yes | no |
The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.
Who holds the blocks
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | Ziply Fiber | 12 | 54.5% |
| ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | Allstream | 3 | 13.6% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - OR | AT&T | 2 | 9.1% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Verizon | 1 | 4.5% |
| LEVEL 3 TELECOM OF OREGON, LLC - OR | Lumen | 1 | 4.5% |
| LEVEL 3 COMMUNICATIONS, LLC - OR | Lumen | 1 | 4.5% |
| COMCAST IP PHONE, LLC | Comcast | 1 | 4.5% |
| ONVOY, LLC - OR | Onvoy | 1 | 4.5% |
Same rate center in other codes
Overlay codes cover the same geography, so one rate center is served by all of them.
Frequently asked
Which prefixes belong to GRESHAM in area code 503?
22 blocks: 328, 405, 465, 489, 491, 492, 512, 573, 618, 660, 661, 663 and 10 more, all listed in the table above.
Which carriers have numbers in GRESHAM?
ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER (12 blocks), ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM (3 blocks), TELEPORT COMMUNICATIONS AMERICA, LLC - OR (2 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (1 block), LEVEL 3 TELECOM OF OREGON, LLC - OR (1 block), LEVEL 3 COMMUNICATIONS, LLC - OR (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is GRESHAM a city?
It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.