NPA-NXX - 540-579

This is the 540-579 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. 540
3. 540-579

The 540-579 subcode mainly covers Catoctin in Loudoun county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Virginia state. Many of the numbers in this subcode are Regular Landline registered to At&t. We hear they employ a large number of people in the Virginia office.
Recently there have been an increase in reported calls, we've had over 312311 comments across our systems for the 540-579 subcode.