NPA-NXX - 423-578

This is the 423-578 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. 423
3. 423-578

The 423-578 subcode mainly covers Kingsport in Sullivan county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Tennessee state. Many of the numbers in this subcode are Regular Landline registered to Centurylink. We hear they employ a large number of people in the Tennessee office.
Recently there have been an increase in reported calls, we've had over 156823 comments across our systems for the 423-578 subcode.