Area Code 423 Phone Number
for Your Business
Get a local 423 number for your business in Chattanooga, TN. Cloud VoIP with SMS, an auto attendant (IVR), and more — starting at $30/ext/mo. No contracts.
What Is Area Code 423?
Area code 423 is a North American telephone area code serving Chattanooga, Tennessee. It has been in service since September 11, 1995 and operates on Eastern & Central Time. It is part of the 423/729 overlay complex. Businesses operating in the 423 area code region use local numbers to build trust with customers, improve answer rates, and establish a professional local presence.
With Zonitel, you can get a new 423 area code number or port your existing one with guided onboarding — no hardware required. Your team can make and receive calls from any device using the Zonitel mobile app or web portal.
Area Code 423 at a Glance
- Region
- Chattanooga / Kingsport / Northeast TN, Tennessee
- In service
- Since September 11, 1995
- Time zone
- Eastern & Central Time
- Overlay
- Shares its territory with 729; local calls use 10-digit dialing
- History
- Created on September 11, 1995 from area code 615
- Later split off
- 865 was created from 423's territory
- Telemarketing hours
- 8 a.m.–9 p.m. in the called party's local time for residential numbers (TCPA, 47 CFR 64.1200(c)(1))
Why Your Business Needs a 423 Local Number
A local number tells customers you're part of the community. People in Chattanooga are more likely to pick up a call from a 423 number they recognize than from an unfamiliar out-of-area number.
Everything Included With Your 423 Number
Zonitel is not just a phone number — it's a complete cloud business phone system. Every plan includes:
Frequently Asked Questions About Area Code 423
What cities use area code 423?
Area code 423 serves the Chattanooga / Kingsport / Northeast TN area of Tennessee. Cities in the 423 region include Chattanooga, TN.
Is area code 423 an overlay?
Yes. 423 is part of the 423/729 overlay, so new numbers in this region can come from any of those area codes, and local calls require 10-digit dialing.
What time zone is area code 423 in?
Area code 423 is in Eastern & Central Time. Telemarketing calls to residential 423 numbers are limited to 8 a.m.–9 p.m. in the called party's local time under the TCPA (47 CFR 64.1200(c)(1)).
Can I get a 423 number for my business without moving there?
Yes. With Zonitel's cloud VoIP, you can get a 423 area code number regardless of where your business is physically located. This lets you establish a local presence in Chattanooga without a physical office.
Can I keep my existing 423 number and switch to Zonitel?
Yes. Number porting is free. Porting commonly takes 5–10 business days depending on your current carrier, and your old service stays active until the coordinated cutover.
How much does a 423 business phone number cost?
Zonitel plans start at $30/extension/month plus tax, with no setup fees and no contracts. Your 423 local number is included in the plan.
Get Your 423 Area Code Number Today
30-day free trial. No annual contract required. Guided onboarding.