NPA-NXX - 203-400

This is the 203-400 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. 203
3. 203-400

The 203-400 subcode mainly covers Trumbull in Fairfield county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Connecticut state. Many of the numbers in this subcode are Cellular (Dedicated) registered to At&t Mobility. We hear they employ a large number of people in the Connecticut office.
Recently there have been an increase in reported calls, we've had over 916829 comments across our systems for the 203-400 subcode.