NPA-NXX - 636-543

This is the 636-543 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. 636
3. 636-543

The 636-543 subcode mainly covers Festus-crystal City in Jefferson county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Missouri 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 Missouri office.
Recently there have been an increase in reported calls, we've had over 218733 comments across our systems for the 636-543 subcode.