Prefix overview
Phone numbers in prefix 309-374
This page covers the 309-374 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
309-374
RATE CENTER
KEITHSBURG
CARRIER
CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL
IL
Prefix range
The prefix 309-374 includes numbers from 3093740000 to 3093749999.
This range is associated with the KEITHSBURG rate center and was originally assigned to CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL.
Numbers in this prefix
20 numbers