Area codes · +1
Area code 503
Area code 503 is centred on Portland, Oregon. We hold 4,419 allocated blocks for it across 63 rate centres, split 42% mobile, 51% landline and 7% VoIP.
The other area codes laid over 503
Area code 503 does not have Portland to itself. 1 other code — 971 — serves the same rate centres, laid over the same ground rather than dividing it. That is an overlay: a new code added when the old one ran out of numbers, covering the same streets. Two neighbours can hold different area codes, so the code says roughly when a number was issued rather than where it sits.
9714,519 blocks, 55 rate centres, mostly mobile
Each holds its own blocks and its own carrier mix, so a 503 number and a 971 number from the same street can report different line types. Filtering Portland by area code needs all 2 of them.
503 is not confined to Portland itself: its blocks sit across 63 rate centres, named in the table below.
Oregon is split across 4 area codes — 541, 971, 503, 458. By allocated blocks 503 is the third largest of them, holding 27% of the Oregon total.
Where 503 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Stfrd-Sndy and Mcminnvl are shortened. Names are reproduced as recorded rather than expanded — the abbreviation is the key the block data is filed under.
| Rate centre | Blocks | Share of 503 |
|---|---|---|
| Portland | 1,587 | 36% |
| Beaverton | 597 | 14% |
| Salem | 353 | 8% |
| Clackamas | 319 | 7% |
| Stfrd-Sndy | 218 | 5% |
| Gresham | 143 | 3% |
| Mcminnvl | 103 | 2% |
| Sherwood | 77 | 2% |
| Dallas | 68 | 2% |
| Woodburn | 68 | 2% |
| Astoria | 67 | 2% |
| North Pl | 66 | 1% |
| Tillamook | 57 | 1% |
| Seaside | 55 | 1% |
| Newberg | 47 | 1% |
| St Helens | 46 | 1% |
| Stayton | 24 | 1% |
| Aumsvltrnr | 23 | 1% |
| Pacific Cy | 23 | 1% |
| Aurora | 22 | 0% |
| Charbonneu | 22 | 0% |
| Clatskanie | 22 | 0% |
| Dayton | 22 | 0% |
| Grandronde | 22 | 0% |
39 further rate centres in 503 hold fewer blocks than these.
Carriers holding the most 503 blocks
Qwest Corporation554 blocks
AT&T Wireless528 blocks
Verizon Wireless397 blocks
Electric Lightwave Llc Dba Allstream309 blocks
Onvoy295 blocks
T-Mobile USA, Inc.290 blocks
The largest holder, Qwest Corporation, has 13% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 503 number still reports the carrier it started with. Closing that gap needs a live query against the routing database. How line type is derived.
Check a single 503 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 503?
Area code 503 covers Portland, Oregon. It is not the only code there: 971 is an overlay on the same rate centres, so a Portland, Oregon number can start with any of them.
Is a 503 number a mobile or a landline?
It can be either, and the digits do not say which. North American mobile and landline numbers share the same ranges, so the answer comes from the carrier holding the block. In 503 the split runs 42% mobile, 51% landline and 7% VoIP, so landline is the most likely single answer.
Which carriers hold 503 numbers?
The largest holders are Qwest Corporation, AT&T Wireless, Verizon Wireless. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 503 numbers are there?
The code holds 4,419 allocated blocks in our copy of the numbering plan. A block is 1,000 or 10,000 consecutive numbers depending on how deeply it has been pooled, so 503 covers on the order of 4,419,000 possible numbers — most of which have never been issued to anyone.