NPA-NXX - 610-503

This is the 610-503 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. 610
3. 610-503

The 610-503 subcode mainly covers Philadelphia in Delaware 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 At&t. 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 558979 comments across our systems for the 610-503 subcode.