503 Area Code
The 503 area code is used by SOME cities and towns in these Counties:
| Clackamas County | Cities & Towns | ZIP Codes | Features |
| Clatsop County | Cities & Towns | ZIP Codes | Features |
| Columbia County | Cities & Towns | ZIP Codes | Features |
| Linn County | Cities & Towns | ZIP Codes | Features |
| Marion County | Cities & Towns | ZIP Codes | Features |
| Multnomah County | Cities & Towns | ZIP Codes | Features |
| Polk County | Cities & Towns | ZIP Codes | Features |
| Tillamook County | Cities & Towns | ZIP Codes | Features |
| Washington County | Cities & Towns | ZIP Codes | Features |
| Yamhill County | Cities & Towns | ZIP Codes | Features |
