Prefix overview
Phone numbers in prefix 773-256
This page covers the 773-256 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
773-256
RATE CENTER
CHICGOZN07
CARRIER
ILLINOIS BELL TEL CO
IL
Prefix range
The prefix 773-256 includes numbers from 7732560000 to 7732569999.
This range is associated with the CHICGOZN07 rate center and was originally assigned to ILLINOIS BELL TEL CO.
Numbers in this prefix
20 numbers