NPA-NXX - 484-278

This is the 484-278 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. 484
3. 484-278

The 484-278 subcode mainly covers Philadelphia in Montgomery 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 Level 3. 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 799874 comments across our systems for the 484-278 subcode.