NPA-NXX - 231-378

This is the 231-378 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. 231
3. 231-378

The 231-378 subcode mainly covers Copemish-thompsonville in Manistee county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Michigan state. Many of the numbers in this subcode are Regular Landline registered to Ace Communications Group. We hear they employ a large number of people in the Michigan office.
Recently there have been an increase in reported calls, we've had over 24733 comments across our systems for the 231-378 subcode.