Area code 423
423 is Chattanooga, Kingsport, Johnson City, Tennessee.
Area code 423 at a glance
- State
- Tennessee
- Main cities
- Chattanooga, Kingsport, Johnson City, Bristol, Morristown, Cleveland, Greeneville
- Time zone
- Eastern TimePart of the area: Central Time
- Local time now
- --:--:--
- Overlay codes
- 729
- In service since
- 1995
729 covers the exact same area as 423 — both are dialed with all 10 digits.
Get a 423 number
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Call a 423 number from abroad
Call any 423 number from your browser — no SIM, no app install, and no international roaming charge.
Calls to United States start at $0.02/min from QuikRing.
Call now in your browserCalling 423 from inside the US or Canada
Dial 1, then 423, then the 7-digit number.
Calling a 423 number or a 1-800 number from outside the US or Canada? Here is how to reach it from abroad.
Frequently asked questions
Where is area code 423?
Area code 423 covers Chattanooga, Kingsport, Johnson City in Tennessee.
What time is it in area code 423?
Area code 423 is in the Eastern Time time zone. See the live clock above for the current local time.
Is 729 the same area as 423?
Yes. 729 is an overlay of 423 — they cover the exact same area, so every call there needs all 10 digits dialed.
How do I get an area code 423 phone number?
Sign up for QuikRing and rent one of the available 423 numbers shown above. It starts working immediately and can receive real calls and text messages.
How much does it cost to call 423 from abroad?
Calls to United States numbers, including area code 423, start at $0.02/min with QuikRing — no roaming plan or SIM needed.