Area Code 503

About Area Code 503

Area code 503 is a geographic telephone area code assigned to Portland, Oregon. It operates in the Pacific time zone and was first introduced in 1947. Original NANP code. Northwestern Oregon. Overlay 971 (2000).

Within Oregon, area code 503 shares numbering capacity with 3 other area codes. The state's 4,233,258-person population (2023 Census Bureau estimate) is served by a combined 4 active codes, with 503 primarily responsible for the Portland region. Oregon's state capital is Salem, and its largest city is Portland.

When you receive a call from a 503 number on your Caller ID, the call originated from a phone number assigned to the 503 area code — but be aware that Local Number Portability (in effect since 2003) means the caller could be physically located anywhere in the US or Canada. Area code 503 only confirms where the number was originally assigned.

Where is the 503 area code located?

Area code 503 is assigned to Portland, Oregon, in the Pacific time zone. The state of Oregon uses 4 active area codes, and 503 is one of them. Calls placed from the 503 area code originate from numbers assigned by NANPA — the North American Numbering Plan Administrator — and the 503 prefix appears on Caller ID for both landline and wireless calls placed from this region.

The Pacific time zone observes Daylight Saving Time, shifting from UTC-8 to UTC-7 in summer. The local time shown above is always current, so you can quickly check whether it's a reasonable hour to call back.

What cities and counties use the 503 area code?

The 503 area code serves 10 notable cities, listed below in order of population. The largest city in the 503 territory is Portland (635,067 residents in Cumberland County).

• Portland, OR — 635,067 residents (39.3% of 503 numbers)
• Salem, OR — 177,723 residents (11% of 503 numbers)
• Eugene, OR — 176,654 residents (10.9% of 503 numbers)
• Gresham, OR — 114,300 residents (7.1% of 503 numbers)
• Hillsboro, OR — 106,547 residents (6.6% of 503 numbers)
• Beaverton, OR — 98,216 residents (6.1% of 503 numbers)
• Bend, OR — 99,178 residents (6.1% of 503 numbers)
• Medford, OR — 85,376 residents (5.3% of 503 numbers)
• Springfield, OR — 62,135 residents (3.8% of 503 numbers)
• Corvallis, OR — 59,427 residents (3.7% of 503 numbers)

Phone number format in area code 503

All phone numbers within area code 503 follow the standard North American 10-digit format:(503) NXX-XXXX. The NXX is the central office prefix (also called an "exchange") and XXXX is the subscriber line number. For long-distance calls within the NANP, dial 1 + 503 + NXX + XXXX. From outside North America, dial your country's international access code, then 1 (the NANP country code), then the 10-digit number.

If you need to verify whether a specific 503 number is wireless, landline, or VoIP, you can use our reverse phone lookup tool. Be aware that number portability means the area code no longer guarantees the caller's physical location — only where the number was first assigned.

History of area code 503

Original NANP code. Northwestern Oregon. Overlay 971 (2000).

The original 86 area codes were assigned by AT&T and Bell Labs in 1947 as part of the North American Numbering Plan. At the time, rotary-dial phones meant codes with lower digits (like 212 for NYC, 213 for LA, 312 for Chicago) were given to the largest cities because they took less time to dial. Today's area code assignments still reflect those early choices, even though touch-tone and cell phones made the original reason obsolete.

Is the 503 area code safe to answer?

Area code 503 itself is a normal geographic code with no elevated spam risk. That said, scammers can spoof any area code — including 503 — so if you don't recognize the full number, let it go to voicemail and verify the caller's identity before calling back.