NPA-NXX - 815-866

This is the 815-866 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. 815
3. 815-866

The 815-866 subcode mainly covers Princeton in Bureau county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Illinois state. Many of the numbers in this subcode are Cellular (Dedicated) registered to Illinois Vally Cellular. We hear they employ a large number of people in the Illinois office.
Recently there have been an increase in reported calls, we've had over 34978 comments across our systems for the 815-866 subcode.