Where Is Area Code 423?
Area code 423 is found in the US state of Tennessee. Primarily servicing the city of Chattanooga (population: 203977), area code 423 covers 26 counties of Tennessee.
Parts of this area code are located in the Eastern time zone, while others are in the Central time zone. This means that some cities in area code 423 are on the same time as New York, NY, while others are on the same time as Chicago, IL.
Area code 423 was brought into effect on September 11, 1995. 423 was split from the parent 615 area code.
Counties in Area Code 423
- Bledsoe,
- Bradley,
- Campbell,
- Carter,
- Claiborne,
- Cocke,
- Cumberland,
- Greene,
- Hamblen,
- Hamilton,
- Hancock,
- Hawkins,
- Johnson,
- Marion,
- McMinn,
- Meigs,
- Monroe,
- Morgan,
- Polk,
- Rhea,
- Roane,
- Scott,
- Sequatchie,
- Sullivan,
- Unicoi,
- Washington.
Most Populous Cities in Area Code 423
| City | County | City Population | Time Zone |
|---|---|---|---|
| Chattanooga | Hamilton | 203,977 | EST |
| Johnson City | Washington | 93,471 | EST |
| Cleveland | Bradley | 90,721 | EST |
| Kingsport | Sullivan | 87,104 | EST |
| Morristown | Hamblen | 50,680 | EST |
| Greeneville | Greene | 44,386 | EST |
| Hixson | Hamilton | 41,122 | EST |
| Bristol | Sullivan | 39,092 | EST |
| Elizabethton | Carter | 33,648 | EST |
| Ooltewah | Hamilton | 33,114 | EST |
| Jonesborough | Washington | 28,058 | EST |
| Soddy Daisy | Hamilton | 27,549 | EST |
| Athens | McMinn | 25,534 | EST |
| Newport | Cocke | 22,550 | EST |
| Rogersville | Hawkins | 21,217 | EST |
| Dayton | Rhea | 19,372 | EST |
| La Follette | Campbell | 18,712 | EST |
| Madisonville | Monroe | 16,708 | EST |
| Signal Mountain | Hamilton | 15,715 | EST |
| Sweetwater | Monroe | 15,169 | EST |
| Church Hill | Hawkins | 14,882 | EST |
| Blountville | Sullivan | 14,247 | EST |
| Mountain City | Johnson | 12,914 | EST |
| Bluff City | Sullivan | 12,743 | EST |
| Erwin | Unicoi | 12,705 | EST |
Note: The above list is based off of the top 25 most populous cities in the area code as per 2012 United States Census Bureau estimates.
View all United States Area Codes.
This page was last updated on July 3, 2015.