| District of Oregon area codes: 503 | |
|---|---|
| Country | United States |
| State/Province | Oregon |
| Major City | Portland |
| Time Zone | Pacific (UTC-08:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 503-423 | Multnomah | Portland, OR | Qwest Corporation |
| 503-424 | Washington | Beaverton, OR | Oregon Tel |
| 503-425 | Multnomah | Portland, OR | Qwest Corporation |
| 503-426 | Multnomah | Portland, OR | North County Communications Corp. |
| 503-427 | Washington | Tigard, OR | Level 3 Communications |
| 503-428 | Marion | Salem, OR | New Cingular Wireless PCS |
| 503-429 | Columbia | Vernonia, OR | Frontier Communications Northwest |
| 503-430 | Washington | Beaverton, OR | Teleport Communications America |
| 503-431 | Washington | Beaverton, OR | Frontier Communications Northwest |
| 503-432 | Washington | Tigard, OR | Teleport Communications America |
| 503-433 | Washington | North Plains, OR | Mcimetro Access Transmission Services LLC |
| 503-434 | Yamhill | Mcminnville, OR | Frontier Communications Northwest |
| 503-435 | Yamhill | Mcminnville, OR | Frontier Communications Northwest |
| 503-436 | Clatsop | Seaside, OR | Qwest Corporation |
| 503-437 | Yamhill | Mcminnville, OR | Sprint Spectrum L.p. |
| 503-438 | Columbia | St Helens, OR | Teleport Communications America |
| 503-439 | Washington | Beaverton, OR | Frontier Communications Northwest |
| 503-440 | Clatsop | Seaside, OR | Cellco Partnership DBA Verizon Wireless |
| 503-441 | Multnomah | Portland, OR | Qwest Corporation |
| 503-442 | Tillamook | Beaver, OR | T-mobile Usa |
There are 784 prefixes, In the code area, the major cities are Aloha, OR;Beaverton, OR;Gresham, OR;Hillsboro, OR;. The major city is Portland.