| 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 |
|---|---|---|---|
| 503-831 | Polk | Dallas, OR | Qwest Corporation |
| 503-832 | Multnomah | Portland, OR | Global Crossing Local Services,inc.-or |
| 503-833 | Multnomah | Portland, OR | Qwest Corporation |
| 503-834 | Clackamas | Estacada, OR | Cascade Utilities |
| 503-835 | Yamhill | Amity, OR | Frontier Communications Northwest |
| 503-836 | Clatsop | Astoria, OR | Level 3 Communications |
| 503-837 | Polk | Dallas, OR | Monmouth Independence Network DBA Minet |
| 503-838 | Polk | Independence, OR | Qwest Corporation |
| 503-839 | Multnomah | Portland, OR | Cricket Communications |
| 503-840 | Washington | Beaverton, OR | Tw Telecom Of Oregon LLC |
| 503-841 | Multnomah | Portland, OR | T-mobile Usa |
| 503-842 | Tillamook | Tillamook, OR | United Telephone-northwest-or DBA Centurylink |
| 503-843 | Yamhill | Sheridan, OR | United Telephone-northwest-or DBA Centurylink |
| 503-844 | Washington | Hillsboro, OR | Frontier Communications Northwest |
| 503-845 | Marion | Mount Angel, OR | Mt. Angel Telephone Co. |
| 503-846 | Washington | Hillsboro, OR | Frontier Communications Northwest |
| 503-847 | Multnomah | Portland, OR | Cricket Communications |
| 503-848 | Washington | Beaverton, OR | Frontier Communications Northwest |
| 503-849 | Multnomah | Portland, OR | Sprint Spectrum L.p. |
| 503-850 | Multnomah | Portland, OR | Tw Telecom Of Oregon LLC |
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.