NPA-NXX - 406-421

This is the 406-421 subcode (NPA-NXX) prefix page. Follow a prefix to find the number you are looking for. We divide our pages up to make them more user friendly to navigate!

1. Area Codes
2. 406
3. 406-421

The 406-421 subcode mainly covers South Miles City in Custer county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Montana state. Many of the numbers in this subcode are Regular Landline registered to Range Telephone Cooperative. We hear they employ a large number of people in the Montana office.
Recently there have been an increase in reported calls, we've had over 11699 comments across our systems for the 406-421 subcode.