Prefix overview
Phone numbers in prefix 503-366
This page covers the 503-366 prefix in the United States. It shows where numbers come from, which carrier is linked to the range, and how this block is structured.
If you are looking for a specific number, you can continue to its dedicated phone page. Otherwise, this page helps you understand the broader number block behind it.
PREFIX
503-366
RATE CENTER
ST HELENS
CARRIER
QWEST CORPORATION
OR
Prefix range
The prefix 503-366 includes numbers from 5033660000 to 5033669999.
This range is associated with the ST HELENS rate center and was originally assigned to QWEST CORPORATION.
Numbers in this prefix
20 numbers