NPA-NXX - 304-378

This is the 304-378 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. 304
3. 304-378

The 304-378 subcode mainly covers Martinsburg in Berkeley county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of West Virginia state. Many of the numbers in this subcode are Regular Landline registered to New Frontiers Telecommunications. We hear they employ a large number of people in the West Virginia office.
Recently there have been an increase in reported calls, we've had over 104169 comments across our systems for the 304-378 subcode.