423 Area Code
Tennessee, USA
Local time now · Eastern Time
3:44 AM
Area code 423 is in Tennessee, USA, serving Chattanooga, Johnson City, Kingsport and Cleveland. It uses Eastern Time and Central Time — the time there now is 3:44 AM. 729 is an overlay for the same area, so local calls need 10-digit dialing. In service since 1995.
| Area code | 423 |
|---|---|
| Location | Tennessee, USA |
| Major cities | Chattanooga, Johnson City, Kingsport, Cleveland, Morristown, Bristol, East Ridge, Greeneville |
| Time zone | Eastern Time / Central Time |
| Overlay codes | 729 |
| In service since | 1995 |
| Dialing | 1+10 digit dialing permissible at service providers discretion |
Other area codes in Tennessee
Time zone converterAll area codes
Frequently asked questions
Where is area code 423?
Tennessee, USA — including Chattanooga, Johnson City, Kingsport, Cleveland and Morristown.
What time zone is area code 423?
Eastern Time and Central Time (the area spans two time zones).
How do I call a 423 number from abroad?
Dial your international access code, then 1 (the country code), then 423 and the 7-digit number — for example +1 423 555 0100. From the UK or India dial 00 1 423 …; from Bangladesh 00 1 423 … .
Is a call from 423 a scam?
Not by itself — 423 is an ordinary geographic area code in Tennessee. Numbers can be spoofed, so be careful with unexpected calls asking for money or personal details.
Sources: North American Numbering Plan Administrator (NANPA) NPA database (10/25/2026); major cities from Wikidata (CC0). An area code shows where a number was first assigned — with number portability and mobile phones, the caller may be anywhere.