The 503 area code covers Portland, Beaverton and 50 more places in Oregon.
Area code 503 is in Oregon, on Pacific Time. In the 503 area, phone numbers are given out most in Multnomah County, then Washington and Marion counties. It has been in service since 1947. 971 covers the same area, so two neighbours can have different area codes.
- Where
- 8 counties in Oregon, mostly Multnomah County, Washington County and Marion County
- Time zone
- Pacific Time
- In service since
- 1947, one of the original area codes
- Shares its area with
- 971 (since 2000)
- Prefixes in use
- 784
- How to dial
- Local calls need all 10 digits: 503-555-0142.
Find out who called you from a 503 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (503) number is on today, use our free carrier lookup.
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Portland holds 44% of the phone prefixes in area code 503.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 784 prefixes in use shows where 503 numbers are actually given out.
- Portland347 prefixes, 44%
- Beaverton107 prefixes, 14%
- Salem73 prefixes, 9%
- Clackamas49 prefixes, 6%
- Gresham22 prefixes, 3%
- McMinnville13 prefixes, 2%
- Sherwood8 prefixes, 1%
- Dallas8 prefixes, 1%
Also served: Woodburn, Astoria, Tillamook and Newberg and 40 smaller places.
Qwest (Lumen) holds the most phone number prefixes in area code 503: 222 of 784.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 784 prefixes in use in 503 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| Qwest (Lumen)Lumen's landline company | 222 | 28% |
| Ziply FiberLandline company | 111 | 14% |
| AT&T MobilityMobile network | 71 | 9% |
| T-MobileMobile network | 56 | 7% |
| Level 3 (Lumen)Lumen's business and wholesale network | 52 | 7% |
| Allstream | 51 | 7% |
| 31 other carriers | 221 | 28% |
47% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
503 has been split once and overlaid once since 1947.
1947
503 is one of the original North American area codes.
1995
On November 5, 1995, 541 splits off and takes part of the 503 area.
2000
On October 1, 2000, 971 is added on top of 503, so new numbers here can get either code.
A 503 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 503 are 253, 206 and 425.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
These are the questions people ask most about area code 503.
Where is area code 503?
503 covers Portland, Beaverton, Salem and Clackamas and 48 more places in Oregon. In the 503 area, phone numbers are given out most in Multnomah County, then Washington and Marion counties.
What state is area code 503 in?
Oregon. 503 is an Oregon area code on Pacific Time.
What cities use area code 503?
The places holding the most 503 prefixes are Portland, Beaverton, Salem, Clackamas, Gresham, McMinnville, Sherwood and Dallas, out of 52 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 503?
No single phone company owns 503. NANPA's records show Qwest (Lumen) holds the most 503 prefixes, 222 of 784, followed by Ziply Fiber and AT&T Mobility. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 503 in?
503 is on Pacific Time.
When did area code 503 start?
503 is one of the original North American area codes, in service since 1947.
Is 503 the same area as 971?
Yes. 971 (since 2000) covers the same ground as 503. Nobody's number changed when it was added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 503 number?
Local calls need all 10 digits: 503-555-0142.
Is 503 a toll-free number?
No. 503 is a regular area code for Portland and Beaverton in Oregon, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 503?
The closest are 253 (Tacoma, Washington), 206/360/564 (Vancouver, Washington), 425 (Bellevue, Washington) and 541/458 (Eugene, Oregon), measured between the centres of each area.
Who called me from a 503 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 503 a scam?
503 is a real Oregon area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.