NPA-NXX - 412-637

This is the 412-637 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. 412
3. 412-637

The 412-637 subcode mainly covers Pittsburgh in Allegheny county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Pennsylvania state. Many of the numbers in this subcode are Regular Landline registered to Xo Communications. We hear they employ a large number of people in the Pennsylvania office.
Recently there have been an increase in reported calls, we've had over 1223348 comments across our systems for the 412-637 subcode.