Kingsport Milling Co 423-246-2712
Principal cities in the northern part of the area code region are Bristol, Johnson City and Kingsport (more commonly known as the Tri-Cities). The principal cities in the south are Chattanooga and Cleveland.
History[edit source | edit]
Area code 423 was created in 1995 when it was split off from area code 615. It was the state's first new area code in 41 years. Originally it consisted of the eastern third of the state. The boundary between 423 and 615 roughly followed the line between the Eastern and Central time zones; generally, Tennessee's share of the Eastern Time Zone was in 423. As a result, the state's three area codes were roughly coextensive with the traditional Grand Divisions of Tennessee; 423 served almost all of East Tennessee, 615 served Middle Tennessee and 901 served West Tennessee.
Morgan County - Population 119,490
Campbell County - Population 90,336
Hamblen County - Population 62,544
Hawkins County - Population 56,833
McMinn County - Population 52,266
Cocke County - Population 35,662