NPA-NXX - 631-428

This is the 631-428 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. 631
3. 631-428

The 631-428 subcode mainly covers Ronkonkoma in Suffolk county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of New York state. Many of the numbers in this subcode are Cellular (Dedicated) registered to T-mobile. We hear they employ a large number of people in the New York office.
Recently there have been an increase in reported calls, we've had over 1493350 comments across our systems for the 631-428 subcode.