| 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 |
|---|---|---|---|
| 503-362 | Marion | Salem, OR | Qwest Corporation |
| 503-363 | Marion | Salem, OR | Qwest Corporation |
| 503-364 | Marion | Salem, OR | Qwest Corporation |
| 503-365 | Marion | Salem, OR | Qwest Corporation |
| 503-366 | Columbia | St Helens, OR | Qwest Corporation |
| 503-367 | Multnomah | Portland, OR | New Cingular Wireless PCS |
| 503-368 | Tillamook | Nehalem, OR | Nehalem Telecomms DBA Nehalem Tel & Tel |
| 503-369 | Columbia | St Helens, OR | New Cingular Wireless PCS |
| 503-370 | Marion | Salem, OR | Qwest Corporation |
| 503-371 | Marion | Salem, OR | Qwest Corporation |
| 503-372 | Washington | Beaverton, OR | Teleport Communications America |
| 503-373 | Marion | Salem, OR | Qwest Corporation |
| 503-374 | Tillamook | Tillamook, OR | Level 3 Communications |
| 503-375 | Marion | Salem, OR | Qwest Corporation |
| 503-376 | Yamhill | Mcminnville, OR | Global Crossing Local Services,inc.-or |
| 503-377 | Tillamook | Bay City, OR | United Telephone-northwest-or DBA Centurylink |
| 503-378 | Marion | Salem, OR | Qwest Corporation |
| 503-379 | Yamhill | Mcminnville, OR | Level 3 Communications |
| 503-380 | Multnomah | Portland, OR | T-mobile Usa |
| 503-381 | Washington | Portland, OR | Sprint Spectrum L.p. |
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.