Prefix overview
Phone numbers in prefix 520-557
This page covers the 520-557 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
520-557
RATE CENTER
CASAGRANDE
CARRIER
COMMIO, LLC
AZ
Prefix range
The prefix 520-557 includes numbers from 5205570000 to 5205579999.
This range is associated with the CASAGRANDE rate center and was originally assigned to COMMIO, LLC.
Numbers in this prefix
20 numbers