There are two area codes (Area Code) used in Portland and the northwestern region of Oregon: 503 and 971.

Many people who are moving to the U.S. for the first time or relocating to Oregon often get confused about which number they will receive for their phone and which area a call is coming from. Understanding the history and current operation of these two area codes can be practically helpful for life in Portland.

Oregon originally used the single area code 503. When the entire state was using the same number, all cities in Oregon, including Portland, Eugene, Salem, and Bend, had the area code 503. However, in the late 1990s, with the explosive increase in demand for phone numbers due to the spread of the internet, faxes, and cell phones, the number of available numbers became insufficient, leading Oregon to split the southern and eastern regions into area code 541 in 1999.

Even after that, the demand for numbers in the Portland metro area continued to grow, resulting in the introduction of area code 971 in 2000. Area code 971 operates as an 'overlay' covering the same area as area code 503, which includes the Portland metropolitan area and the northwestern coastal region of Oregon. The overlay method allows two area codes to coexist within the same geographical area, where existing 503 subscribers retain their numbers while new subscribers are assigned either 971 or 503 numbers based on availability.

With the introduction of the overlay method, when making calls within the Portland area, you must dial all 10 digits. In the past, it was sufficient to dial only 7 digits when calling within the same area code, but with two area codes coexisting in the same area, you must now include the area code when dialing to connect. New residents in Portland may be surprised when they cannot connect by dialing just 7 digits, so it's important to remember this rule.

Which number you get, 503 or 971, depends on the carrier and the time of subscription, and the number itself does not affect service quality or reliability. However, some long-time Oregonians have an emotional preference for 503, considering it the 'old Portland number.' When opening a mobile phone account, you may have the option to choose your desired area code, but this is not always possible.

From a business perspective, it is advantageous for businesses targeting Portland area customers to use either a 503 or 971 number to enhance local credibility. Businesses using local numbers tend to feel more familiar to local customers compared to those using toll-free numbers like 800 or 888 or numbers from other areas. This is especially true for local businesses run by Koreans, such as restaurants, hair salons, and real estate agencies, where using the Portland area code is recommended.

Expanding to the entire state of Oregon, Salem, located south of Portland, is also included in the 503/971 area. The central and eastern regions of Oregon use area code 541. This includes areas near Eugene, Corvallis, Bend, Medford, and Coeur d'Alene. The third area code in Oregon, 458, was added in 2010 and is used as an overlay with area code 541.

It is also good to be aware of the spam call patterns you may frequently encounter when receiving calls in Portland. Even numbers starting with 503 or 971 can often be robocalls or spam calls. Particularly, calls may come from 'spoofing' numbers that manipulate the first few digits to resemble your own number, so it's wise to be cautious when receiving calls from unknown numbers. Registering with the National Do Not Call Registry of the Federal Trade Commission (FTC) can help reduce some telemarketing calls.

When making international calls to Portland, you should first enter the U.S. country code +1, then dial area code 503 or 971, followed by the 7-digit number. In other words, the format is +1-503-XXX-XXXX or +1-971-XXX-XXXX. When calling from Korea to Portland, you should prepend the international dialing access code (001 or 010) and then dial 1-503-XXX-XXXX.

It's also important to know emergency contact numbers in Portland. For fire, crime, or medical emergencies, you can call 911. For non-emergency police reports, contact the Portland Police Bureau non-emergency line at 503-823-3333. For various city information and complaint submissions, you can call 311 for Portland city information services. The 311 service also provides interpretation services, so those who are not comfortable with English can also use it.