Prefix overview
Phone numbers in prefix 773-378
This page covers the 773-378 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
773-378
RATE CENTER
CHICGOZN05
CARRIER
ILLINOIS BELL TEL CO
IL
Prefix range
The prefix 773-378 includes numbers from 7733780000 to 7733789999.
This range is associated with the CHICGOZN05 rate center and was originally assigned to ILLINOIS BELL TEL CO.
Numbers in this prefix
20 numbers