Prefix overview
Phone numbers in prefix 309-399
This page covers the 309-399 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
309-399
RATE CENTER
LA ROSE
CARRIER
FRONTIER NORTH, INC. - IL
IL
Prefix range
The prefix 309-399 includes numbers from 3093990000 to 3093999999.
This range is associated with the LA ROSE rate center and was originally assigned to FRONTIER NORTH, INC. - IL.
Numbers in this prefix
20 numbers