Prefix overview
Phone numbers in prefix 406-440
This page covers the 406-440 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
406-440
RATE CENTER
HELENA
CARRIER
3 RIVERS TELEPHONE COOPERATIVE, INC. - MT
MT
Prefix range
The prefix 406-440 includes numbers from 4064400000 to 4064409999.
This range is associated with the HELENA rate center and was originally assigned to 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT.
Numbers in this prefix
20 numbers