Prefix overview
Phone numbers in prefix 406-428
This page covers the 406-428 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
406-428
RATE CENTER
GRASSRANGE
CARRIER
MID-RIVERS TEL. COOP., INC.
MT
Prefix range
The prefix 406-428 includes numbers from 4064280000 to 4064289999.
This range is associated with the GRASSRANGE rate center and was originally assigned to MID-RIVERS TEL. COOP., INC..
Numbers in this prefix
20 numbers