Prefix 503-305 — Clackamas, OR
503-305 identifies a block of numbers in Clackamas, OR, within the 503 area code. Every US prefix is tied to exactly one rate center; this one is Clackamas.
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 — 503-305 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.
NANPA's central-office code records list MCIMETRO ACCESS TRANSMISSION SERVICES LLC (OCN 7229) as the code holder. Because 503-305 participates in thousands-block pooling, individual 1,000-number blocks may belong to other carriers than the code holder.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 503-302 | Salem | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR |
| 503-303 | Clackamas | MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
| 503-304 | Salem | QWEST CORPORATION |
| 503-306 | Portland | QWEST CORPORATION |
| 503-307 | Portland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR |
| 503-308 | Clatskanie | TELEPORT COMMUNICATIONS AMERICA, LLC - OR |
FAQ
Where is 503-305 located?
The prefix is assigned to the Clackamas rate center in OR, area code 503. It is part of the Portland-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area.
Which company owns 503-305 numbers?
MCIMETRO ACCESS TRANSMISSION SERVICES 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 503-305 safe to answer?
The prefix itself says nothing about the caller. Legitimate Clackamas businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.