503 Area Code: Portland, Oregon and the 971 Overlay

The essentials

503 area code: quick facts

How 503 became Portland's code

1. January 1947: Area code 503 opens, according to the FCC's Table 6. NANPA gives January 1, 1947 as its in-service date. It was Oregon's only area code until 541 opened in 1995.
2. November 5, 1995: Area code 541 opens, taken from 503 (NANPA; FCC lists November 1995).
3. April 26, 1999: The Oregon Public Utility Commission issues Order No. 99-286 in docket UM 924. As its later order sums it up, the plan imposed a new area code "over all of the present area code 503 with the exception of the immediate coastal area."
4. July 11, 1999: The initial implementation date set by Order No. 99-286. A permissive dialing period begins, during which, in the words of the later order, "both the old and the new numbers will work."
5. October 21, 1999: Order No. 99-652 extends the permissive dialing period from January 30, 2000 to October 1, 2000. The commission says it is not reconsidering the choice of an overlay over a geographic split.
6. October 2000: The FCC lists 971 as opened. October 1, 2000 is the end of the extended permissive period.
7. November 21, 2006: The Oregon commission approves the industry plan to expand the 503/971 overlay to the remaining 14 rate centers in Clatsop and Tillamook counties (NANPA Planning Letter PL-359).
8. October 21, 2007: Permissive ten-digit dialing begins in the coastal rate centers.
9. April 27, 2008: Ten-digit dialing becomes mandatory on the coast at 12:01 a.m. Pacific, and it is the earliest date a 971 prefix can be activated in the coastal rate centers.
10. April 2026: NANPA's 2026-1 analysis projects that the 503/971 area will run out of numbers in the first quarter of 2041.

Where area code 503 is used

Since April 27, 2008, 503 and 971 cover the same ground, so the numbering sources describe them together. NANPA's Planning Letter PL-359 attaches a "503 & 971 Rate Center Map" dated October 2006. The rate centers labeled on that map include Portland, Beaverton, Gresham, Clackamas, Sherwood, Stafford-Sandy, Estacada, Salem, Silverton, Stayton, Woodburn, McMinnville, Newberg, St Helens, Scappoose, Clatskanie, and Government Camp.

The same letter names the 14 coastal rate centers that joined the overlay in 2008: Astoria, Bay City, Beaver, Cannon Beach, Cloverdale, Garibaldi, Jewell, Knappa, Nehalem, Pacific City, Rockaway Beach, Seaside, Tillamook, and Warrenton. It places them in the coastal counties of Clatsop and Tillamook.

Other rate centers labeled on the 2006 map include Amity, Aurora, Canby Needy, Carlton, Charbonneau, Colton, Corbett, Dayton, Detroit, Falls City, Gervais, Grand Ronde, Hood Land, Lyons, Mill City, Molalla, Mount Angel, North Plains, Rainier, Redland, Scio, Sheridan, St Paul, Vernonia, Westport, Willamina, and Yamhill. Some map labels may be cut off or repeated, so treat the list as a sample, not a complete inventory.

A rate center is a billing area, not a city boundary, and the map dates from 2006. The sources checked do not give an official county list for 503. If a specific address matters, confirm its area code with your phone provider.

Why 971 was added to the 503 area

An area code holds a limited supply of numbers. By the late 1990s the 503 area needed relief, and the Oregon Public Utility Commission opened docket UM 924 to choose a method. Its April 1999 order picked an overlay, a new code laid over the same area, rather than a geographic split, the method NANPA shows was used for 541 in 1995.

The plan left out "the immediate coastal area" at first. Order No. 99-652 refers to "the coastal 503 area code not subject to the 971 area code," and says a federal waiver to assign numbers in blocks of 1,000 instead of 10,000 might ease pressure there and in the 541 area. The commission named the 10,000-number block assignment procedure as "the largest single factor creating a need for more telephone numbers."

The same order explains why the permissive period ran longer than planned. Staff told the commission that demand for new prefixes had slowed, and that many alarm companies in the 503 area could not meet a January 2000 deadline, because older alarm systems had to be reprogrammed through on-site visits.

Supply has held up since. NANPA's April 2026 analysis, based on data as of March 1, 2026, projects that the 503/971 area will run out of numbers in the first quarter of 2041. That is five quarters later than the October 2025 forecast, and NANPA notes the change reflects reduced historical and projected demand. Forecasts move from one analysis to the next, so treat the date as an estimate.

Neighboring area codes in Oregon

The table shows how each Oregon code relates to 503, based on the FCC and NANPA sources in this guide. Codes in neighboring states are not listed, because the sources checked do not describe which ones border the 503 area.

NANPA's April 2026 analysis projects that the 458/541 area will run out of numbers in the second quarter of 2051, about ten years after 503/971.

The 971 overlay on the 503 area

An overlay adds a second area code to the same geographic area, so existing numbers do not change. In the 503 area:

• The Oregon commission chose an overlay in April 1999 and set July 11, 1999 as its initial implementation date.
• The permissive dialing period, when seven- and ten-digit local calls both worked, was extended to October 1, 2000.
• Coastal Clatsop and Tillamook counties were excluded at first and joined on April 27, 2008.
• Since then, NANPA says, all local and extended area service calls within and between 503 and 971 in the overlay area require 10-digit dialing.

How the coast joined in 2008. The north coast kept seven-digit local dialing for years after the rest of the 503 area changed. NANPA's Planning Letter PL-359 describes the switch. The Oregon commission approved the industry plan on November 21, 2006. A permissive period began at 12:01 a.m. Pacific on October 21, 2007, when coastal callers could dial local calls with seven or ten digits but were encouraged to use ten. Mandatory ten-digit dialing began at 12:01 a.m. Pacific on April 27, 2008, and that was also the earliest date a 971 prefix could be activated in the coastal rate centers. NANPA asked carriers to make sure 971 was active throughout their networks.

Because the codes share one territory, two neighbors on the same street can have different area codes. A 971 number does not point to a different part of the region than a 503 number.

Time zone and daylight saving time

Area code 503 uses Pacific Time. The tz database lists America/Los_Angeles with the label "Pacific". Oregon is not entirely in one zone: the tz database also lists America/Boise as "Mountain - ID (south), OR (east)", and the federal rule for the boundary between the Mountain and Pacific zones (49 CFR 71.9) runs along the north and west lines of Malheur County in far eastern Oregon. The rate centers on NANPA's 503 map are all in northwest Oregon, on the Pacific side of that line.

NIST says daylight saving time begins at 2:00 a.m. on the second Sunday of March and ends at 2:00 a.m. on the first Sunday of November. The NIST page lists Hawaii, American Samoa, Guam, Puerto Rico, the Virgin Islands, and Arizona as places that do not observe it, and Oregon is not on that list. In 2026, NIST gives March 8 and November 1 as the change dates.

How to dial a 503 number

North American numbers have three parts: a country code, a three-digit area code, and a seven-digit local number. NANPA says the ITU assigned country code 1 to the NANP area. NANPA's dialing plan for the 503/971 area is 10 digits for local and extended area service calls, 1 plus 10 digits for toll calls, and 0 plus 10 digits for operator-assisted calls such as collect or credit card calls.

From outside the NANP area, a caller dials the international access code used in their country, then 1, then the ten-digit number. On a website or business card, writing the number as +1 503 555 0100 works for callers at home and abroad, and keeping the area code in every listing matches the ten-digit rule for local calls.

Order No. 99-652 shows why stored numbers matter: many alarm companies in the 503 area could not meet the first deadline, because older alarm systems had to be reprogrammed through on-site visits. Check that phone systems, alarm panels, fax machines, and call forwarding settings store full ten-digit numbers, and that they accept both 503 and 971.

Caller ID and scams with a 503 number

The FTC warns that "Scammers can make any name or number show up on your caller ID. That's called spoofing." Scammers can also match the first six digits of your own number, which the FTC calls neighbor spoofing.

• If you pick up and do not recognize the caller, the FTC advises that you hang up.
• Letting an unknown call go to voicemail is one option.
• The FTC says call blocking is your best defense against unwanted calls.

The FTC pages checked do not say that 503 numbers are targeted more than others. A 503 number shows the code that was assigned, not who is calling or where they are. Because 971 shares the same area, a 971 caller is just as likely to be local as a 503 caller, and neither code proves the caller is in Portland.

Business numbers in Portland and northwest Oregon

503 has been the Portland code since 1947 (FCC), and the rate centers on the NANPA map run from St Helens and the north coast down to Salem, Stayton, and Mill City. Businesses elsewhere in Oregon will more likely hold 541 or 458 numbers, since 541 was split from 503 in 1995 (NANPA).

Because 971 overlays the whole 503 area, a new line in the region may carry 971 instead of 503. A business that wants a particular code should ask its provider which code a new line gets, since that depends on current inventory.

Because 503 and 971 share territory, route calls by team or extension, not by area code. A caller with a 971 number may be next door to your office, and the area code alone does not show where a caller is.

Whether a specific 503 number can be assigned to your business depends on your phone provider and its current inventory. This guide does not make claims about availability.

Important: Confirm availability with your provider before you plan a campaign or print a number on materials.

Before you use a 503 number

• Confirm the number is available from your provider, and get its terms in writing.
• Ask who owns the number and whether it can be moved to another provider if you switch.
• Confirm which code your line uses. 503 and 971 both serve the same area.
• Print and publish numbers with the area code, because local calls in the 503/971 area are dialed with 10 digits.
• Make sure your phone system, contact lists, forwarding rules, and alarm or gate equipment store full ten-digit numbers and accept both 503 and 971.
• Check each site's address. The sources used here give rate centers, not street boundaries, so confirm the address with your provider.
• Plan for caller ID. A 503 number does not prove who is calling, and neighbor spoofing copies the first six digits of your own number.

Related guides and tools

• 206 area code guide: Seattle, the next large Pacific Northwest metro, for comparison with Portland.
• 415 area code guide: San Francisco, another West Coast city on Pacific Time, for comparison with Portland.
• 916 area code guide: Sacramento, another West Coast metro, for comparison with Portland.
• What is a DID number?: what a DID is, local versus toll-free types and porting rules.
• Business phone number porting: how number porting works, how long it takes and how to prepare.
• Full list of U.S. area codes by state, with the overlay codes and time zone for every code.
• Browse all U.S. area code guides, including overlay codes that do not have their own guide yet.
• Business phone system and call routing for local numbers in Portland.

Frequently asked questions