Area code 503: where it is and who calls from it
Area code 503 is in Oregon.
Oregon (Portland, Salem, Hillsboro, Beaverton, St. Helens, Tillamook, Astoria, and most of northwestern Oregon)
| Where | Oregon |
|---|---|
| Time zone | Pacific Time ยท local time |
| In service since | 1947 |
| Overlay | Yes, with 971 |
| Prefixes assigned | 784 of 792 possible (99%) |
Overlay: 503 covers the same area as 971. Overlay areas use 10-digit dialing, so a seven-digit number alone won't connect, and neighbors can have different area codes.
Where 503 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 503, with how many prefixes each has.
Plus 2 smaller rate centers.
Who holds 503 numbers
- Mobile carrier 24%
- Local phone company 45%
- Internet / business phone carrier 25%
- Paging service 3%
- Phone company 3%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| CenturyLink / Lumen | Local phone company | 240 | 31% |
| Ziply Fiber | Local phone company | 111 | 14% |
| AT&T Mobility | Mobile carrier | 71 | 9% |
| T-Mobile (including Sprint) | Mobile carrier | 56 | 7% |
| Verizon Wireless | Mobile carrier | 54 | 7% |
| Level 3 (Lumen) | Internet / business phone carrier | 52 | 7% |
| Allstream | Internet / business phone carrier | 51 | 7% |
| Teleport Communications America | Internet / business phone carrier | 34 | 4% |
| MCImetro (Verizon Business) | Internet / business phone carrier | 29 | 4% |
| Spok | Paging service | 22 | 3% |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number.
States served: Oregon.
Other area codes in Oregon
Got a call from 503?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 503 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.