Prefix overview
Phone numbers in prefix 630-257
This page covers the 630-257 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
630-257
RATE CENTER
LEMONT
CARRIER
ILLINOIS BELL TEL CO
IL
Prefix range
The prefix 630-257 includes numbers from 6302570000 to 6302579999.
This range is associated with the LEMONT rate center and was originally assigned to ILLINOIS BELL TEL CO.
Numbers in this prefix
20 numbers