Prefix overview
Phone numbers in prefix 815-444
This page covers the 815-444 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
815-444
RATE CENTER
CRYSTAL LK
CARRIER
ILLINOIS BELL TEL CO
IL
Prefix range
The prefix 815-444 includes numbers from 8154440000 to 8154449999.
This range is associated with the CRYSTAL LK rate center and was originally assigned to ILLINOIS BELL TEL CO.
Numbers in this prefix
20 numbers