NPA-NXX - 435-257

This is the 435-257 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. 435
3. 435-257

The 435-257 subcode mainly covers Tremonton in Box Elder county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Utah state. Many of the numbers in this subcode are Regular Landline registered to Frontier. We hear they employ a large number of people in the Utah office.
Recently there have been an increase in reported calls, we've had over 49975 comments across our systems for the 435-257 subcode.