Prefix overview
Phone numbers in prefix 406-204
This page covers the 406-204 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
406-204
RATE CENTER
HELENA
CARRIER
LEVEL 3 COMMUNICATIONS, LLC - MT
MT
Prefix range
The prefix 406-204 includes numbers from 4062040000 to 4062049999.
This range is associated with the HELENA rate center and was originally assigned to LEVEL 3 COMMUNICATIONS, LLC - MT.
Numbers in this prefix
20 numbers