NPA-NXX - 617-503

This is the 617-503 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. 617
3. 617-503

The 617-503 subcode mainly covers Cambridge in Middlesex county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Massachusetts state. Many of the numbers in this subcode are Regular Landline registered to Verizon Communications. We hear they employ a large number of people in the Massachusetts office.
Recently there have been an increase in reported calls, we've had over 1503085 comments across our systems for the 617-503 subcode.