Area code 503 – Oregon
503 is one of the original area codes, in service across Oregon since 1947. All but a handful of its 786 number blocks are allocated (784 of 786), so it is effectively exhausted. Lumen / CenturyLink is the largest holder with 37.2% of blocks, ahead of Other CLEC / VoIP at 25.1%. It shares its geography with overlay codes 971, so local calls take all ten digits. FTC complaints naming a 503 caller ID totalled 399 in the 33 days to 30 October 2026 (252nd of 422 ranked codes).
Who holds 503 number blocks
Share of the 784 assigned NXX blocks (99.7% of the 786 possible), across 41 carriers. This is share of number blocks, not of subscribers.
- Lumen37.2%
- Ziply Fiber14.2%
- AT&T13.4%
- Verizon10.6%
- T-Mobile8%
- Allstream6.5%
- Other CLEC / VoIP4.5%
- Spok2.8%
- Onvoy1.7%
- Comcast0.6%
- Bandwidth0.3%
- Charter0.3%
Spam complaints naming 503
FTC Do Not Call complaints where the caller ID was a 503 number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are frequently spoofed, so these are complaints about the code, not calls proven to originate in it.
Rate centers in 503
NANPA allocates number blocks to rate centers and records their names abbreviated to ten characters, so these are NANPA's codes rather than place names – CHAMPAURBN is Champaign-Urbana, NWYRCYZN01 is a New York City zone. We show them unchanged instead of guessing at the full names. Showing the largest 5 of 63.
Timeline
- 1947 503 assigned in the original North American Numbering Plan.
More about 503
Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.
Frequently asked about 503
What state is area code 503?
Oregon. It covers the same area as 503/971.
Can I still get a 503 number?
Only from recycled stock. 784 of the 786 available blocks are already allocated, so new numbers in the area normally come from the overlay codes (503/971).
Is a call from 503 a scam?
Not by itself. 503 drew 399 FTC complaints in the 33 days to 30 October 2026, 252nd of 422 ranked codes – mid-pack or lower. Spam callers spoof caller IDs, so the only useful check is the full number.
Which carrier owns 503 numbers?
Lumen / CenturyLink holds the largest share of assigned number blocks at 37.2%. The rest is spread across 3 other carriers. This is share of number blocks, not of subscribers – people keep their numbers when they switch carriers.
Do I need to dial 10 digits in 503?
Yes – ten digits for local calls in 503, because it shares its area with another code.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 25 daily files 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
NANPA dialing note for this code: “10D”. Reviewed by the data desk. Spotted an error? Request a correction.