Area Codes
| 503 | Oregon (Portland, Salem, Rainier, St. Helens, Tillamook, Astoria and northwestern Oregon, overlays with 971 except in coastal area) | More information at: Area Code 503 Phone Number Blocks
| 503 | Oregon (Portland, Salem, Rainier, St. Helens, Tillamook, Astoria and northwestern Oregon, overlays with 971 except in coastal area) | More information at: Area Code 503 Phone Number Blocks