Prefix 503-928 — Portland, OR
The 503-928 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.
Code-holder of record: NEW CINGULAR WIRELESS PCS, LLC (OCN 6010), assigned August 8, 2006. The prefix is pooled: its ten thousands-blocks can be shared among several carriers, so different 503-928 numbers may be served by different companies.
Caller ID showing 503-928 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 |
|---|---|---|
| 503-925 | Sherwood | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER |
| 503-926 | Portland | NEW CINGULAR WIRELESS PCS, LLC |
| 503-927 | Portland | T-MOBILE USA, INC. |
| 503-929 | Portland | NEW CINGULAR WIRELESS PCS, LLC |
| 503-930 | Salem | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR |
| 503-931 | Salem | NEW CINGULAR WIRELESS PCS, LLC |
FAQ
Where is 503-928 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 503-928 numbers?
NEW CINGULAR WIRELESS PCS, LLC 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 503-928 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.