Prefix overview
Phone numbers in prefix 623-691
This page covers the 623-691 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
623-691
RATE CENTER
PHOENIX
CARRIER
QWEST CORPORATION
AZ
Prefix range
The prefix 623-691 includes numbers from 6236910000 to 6236919999.
This range is associated with the PHOENIX rate center and was originally assigned to QWEST CORPORATION.
Numbers in this prefix
20 numbers