1. World Map/
  2. North America/
  3. US/
  4. Area Codes/
  5. Area Code 423

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.

Map of  with area code 423 highlighted

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.

Trending on WorldAtlas

This page was last updated on July 3, 2015.