Prefix overview
Phone numbers in prefix 503-231
This page covers the 503-231 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
503-231
RATE CENTER
PORTLAND
CARRIER
QWEST CORPORATION
OR
Prefix range
The prefix 503-231 includes numbers from 5032310000 to 5032319999.
This range is associated with the PORTLAND rate center and was originally assigned to QWEST CORPORATION.
Numbers in this prefix
20 numbers