Prefix 503-278 — Portland, OR
The 503-278 prefix belongs to area code 503 and is anchored to the Portland rate center (OR). In NANP terms, the prefix — or NXX — determines the rate center a number is billed against.
Portland is part of the Portland-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area. For routing purposes it sits in LATA 672. Numbers here keep Pacific time.
The assigned code holder is CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR, operating company number 5820, assigned August 5, 2008. This is a pooled prefix — expect numbers within it to be split across more than one carrier in 1,000-number blocks.
Caller ID showing 503-278 is not proof the call came from Portland: spoofing and porting both detach numbers from their origin. To verify a caller, hang up and dial the organization's published number, and report suspicious calls to the FTC.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 503-275 | Portland | QWEST CORPORATION |
| 503-276 | Portland | QWEST CORPORATION |
| 503-277 | Beaverton | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER |
| 503-279 | Portland | QWEST CORPORATION |
| 503-280 | Portland | QWEST CORPORATION |
| 503-281 | Portland | QWEST CORPORATION |
FAQ
Where is 503-278 located?
The prefix is assigned to the Portland rate center in OR, area code 503. It is part of the Portland-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area.
Which company owns 503-278 numbers?
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR holds the code, but the prefix is pooled — individual thousands-blocks can be assigned to other carriers, and numbers may be ported to any provider.
Is a call from 503-278 safe to answer?
The prefix itself says nothing about the caller. Legitimate Portland businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.