Prefix 503-442 — Portland, OR
503-442 identifies a block of numbers in Portland, OR, within the 503 area code. Every US prefix is tied to exactly one rate center; this one is Portland.
The rate center lies in the Portland-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area. The serving LATA is 672. Local time follows the Pacific zone.
Treat the on-screen number as a hint, not evidence — 503-442 can be spoofed like any US prefix. If a call feels off, verify through an official callback number and file a complaint with the FCC or FTC.
The assigned code holder is T-MOBILE USA, INC., operating company number 6529, assigned January 26, 2005. This is a pooled prefix — expect numbers within it to be split across more than one carrier in 1,000-number blocks.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 503-439 | Beaverton | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER |
| 503-440 | Seaside | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR |
| 503-441 | Portland | QWEST CORPORATION |
| 503-443 | Beaverton | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER |
| 503-444 | Portland | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM |
| 503-445 | Portland | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM |
FAQ
Where is 503-442 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 503-442 numbers?
T-MOBILE USA, INC. 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 503-442 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.