Area code 423
Area code in East Tennessee, United States / From Wikipedia, the free encyclopedia
Area code 423 is a telephone area code in the North American Numbering Plan for the U.S. state of Tennessee. It comprises two disconnected areas of East Tennessee that are separated by area code 865.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/3/32/Area_codes_TN.png)
Principal cities in the northern part of the area code region are Morristown, Greeneville, Kingsport, Johnson City, and Bristol (more commonly known as the Tri-Cities region). The principal cities in the south are Chattanooga and Cleveland.