Prefix 503-374 — Tillamook, OR
503-374 identifies a block of numbers in Tillamook, OR, within the 503 area code. Every US prefix is tied to exactly one rate center; this one is Tillamook.
The serving LATA is 672. Local time follows the Pacific zone.
Treat the on-screen number as a hint, not evidence — 503-374 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 LEVEL 3 COMMUNICATIONS, LLC - OR (OCN 3234) as the code holder, assigned June 17, 2002. Because 503-374 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 |
|---|---|---|
| 503-371 | Salem | QWEST CORPORATION |
| 503-372 | Beaverton | TELEPORT COMMUNICATIONS AMERICA, LLC - OR |
| 503-373 | Salem | QWEST CORPORATION |
| 503-375 | Salem | QWEST CORPORATION |
| 503-376 | McMinnville | LEVEL 3 COMMUNICATIONS, LLC - OR |
| 503-377 | Bay City | UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR |
FAQ
Where is 503-374 located?
The prefix is assigned to the Tillamook rate center in OR, area code 503.
Which company owns 503-374 numbers?
LEVEL 3 COMMUNICATIONS, LLC - 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 503-374 safe to answer?
The prefix itself says nothing about the caller. Legitimate Tillamook businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.