What area code is 423?
Here's everything about it.
Instant lookup for the 423 area code — location, time zone, cities served, and who's been calling from it. No sign-up, no app.
423 at a glance
Summary
Cities & regions served by 423
Chattanooga1 community on record for 423.
Where 423 sits on the map
No overlayCoverage area
About the 423 region
423 covers Chattanooga in Tennessee. The code has been in service since 1995.
423 currently has no overlay, so its territory keeps a single, unshared code.
Split of 615; 1999: split to create 865; 2025: overlaid with 729.
Who called me from 423?
Community reports- Caller ID is trivially spoofed: an incoming call that displays 423 does not prove the caller is really in the 423 region or even in the United States.
- Avoid calling back unknown one-ring numbers — some premium-rate scams rely on curiosity callbacks.
- Never share verification codes, payment details, or remote access during an unsolicited call, even if the caller claims to be your bank or a government agency.
- When a 423 call pressures you to act immediately, hang up and contact the organization directly through its official number.
Be the first to add a community report for a 423 number below.
Frequently asked questions
FAQWhat area code is 423?+–
423 is a telephone area code serving Chattanooga in Tennessee, United States, in service since 1995.
Where is area code 423 located?+–
It covers Chattanooga in Tennessee.
What time zone is 423?+–
423 observes Eastern (ET), which is UTC−5 / −4 DST and follows daylight saving time.
When did area code 423 start?+–
423 entered service in 1995. Its history: split of 615; 1999: split to create 865; 2025: overlaid with 729.
Is 423 a scam area code?+–
Scam and robocall traffic can use any North American code, 423 included — caller ID is easy to spoof, so the code alone does not tell you who is really calling. Check the community reports on this page before calling back an unknown 423 number, and report anything suspicious.
Can I get a 423 phone number?+–
Yes — most mobile carriers and VoIP providers let you request a 423 number regardless of where you physically live.