Area Code 423

Tennessee (TN) • Chattanooga, Johnson City, Kingsport, Cleveland, Greeneville, Morristown, Afton, Apison • Eastern Time (ET)

What Stands Out

•Coverage: 1.5M people across 151 ZIP codes.
•Major cities: Chattanooga, Johnson City, Kingsport.

Spotlight: Coverage

Snapshot highlights for area code 423.

Income

36th

Home values

54th

Poverty rate

70th

Area Code Basics

Primary State

Tennessee (TN)

States Served

Tennessee (TN)

Major Cities

Chattanooga, Johnson City, Kingsport, Cleveland, Greeneville, Morristown, Afton, Apison

Time Zone(s)

Eastern Time (ET), Central Time (CT)

Est. Population

1.5M

ZIP Codes

151

Data accuracy & methodology

This report aggregates 2020–2024 ACS 5-year estimates and geographic overlays for orientation. Area-code service areas can cross ZIP/state boundaries and change over time; verify official assignments with NANPA for critical use.