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Where is the 423 Area code?
The 423 area code is located in eastern Tennessee, primarily serving Chattanooga and nearby cities, including Kingsport, Bristol, Johnson City, and surrounding communities. It covers a significant portion of the Greater Eastern Tennessee region and is widely used by residents, businesses, and public institutions in these areas.
This region is home to landmarks like the Tennessee River in Chattanooga and the scenic Lookout Mountain in Hamilton County, offering a glimpse of eastern Tennessee’s charm. Residents and businesses in these areas use 423 area code phone numbers to maintain clear, local communication and strengthen their presence within the region.
Time Zone
The 423 area code primarily follows the Eastern Time Zone (ET), which is UTC−5:00 (GMT−5) in winter and UTC−4:00 (GMT−4) in summer during Daylight Saving Time. However, because the 423 area spans parts of eastern Tennessee near the state’s time zone boundary, a small portion, such as in Sequatchie and Bledsoe counties, falls in the Central Time Zone (UTC−6:00 in winter and Central Daylight Time UTC−5:00 in summer), so time can differ by one hour depending on the exact county.
423 Area Code In Tennessee
Tennessee is located in the southeastern United States, covering about 42,181 square miles (109,247 km²) with a population of over 7.1 million residents as of 2023. The state uses multiple area codes, including 423, 615, 731, 865, 901, 931, as well as overlays 629 (for 615) and 729 (for 423), covering all regions of Tennessee as of 2025.
The 423 area code region in eastern Tennessee has a diverse economy, with major sectors including manufacturing, healthcare, education, technology, logistics, and tourism. Key employers include Eastman Chemical, Volkswagen, Ballad Health, Erlanger Health System, and East Tennessee State University. Landmarks such as the Tennessee River, Lookout Mountain, historic downtowns, and the nearby Appalachian landscapes highlight the region’s cultural, historical, and economic significance.
Additionally, local businesses in eastern Tennessee can use a 423 area code phone number to establish credibility, build customer trust, and strengthen their presence across cities and surrounding communities.
History of 423 Area Code
Area code 423 was introduced on September 11, 1995, when it was split from area code 615 to meet the growing demand for phone numbers in eastern Tennessee. It was one of several new area codes added nationwide that year. In 1999, further growth led to the creation of area code 865, which took over the Knoxville metropolitan area and surrounding communities, reducing the coverage of 423.
To maintain number availability, area code 729 was approved as an overlay for the 423 region and entered service in 2025, meaning both area codes now serve the same geographic area and require 10-digit dialing.
Search 423 Area Code Virtual Phone Numbers
Explore a wide range of Calilio’s 423 phone numbers and acquire one to create a local presence in Chattanooga, Tennessee.
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How Does a 423 Area Code Phone Number Work for Your Business?
A 423 area code business phone number is a standard 10-digit number under the North American Numbering Plan (NANP). It primarily serves eastern Tennessee and now shares its region with the 729 overlay. This area code phone number allows customers in the region to reach your business easily using landlines, mobile phones, or VoIP platforms.
Since 423 shares an overlay with 729, the region requires 10-digit dialing. Callers within the 423/729 overlay area must dial the complete area code + the phone number, for example, 423-555-xxxx or 729-555-xxxx. Callers outside the area typically dial 1 + area code + phone number, such as 1-423-555-1234.
Additionally, businesses can get a 423 area code number through landline providers, mobile carriers, or virtual phone services like Calilio. Among these options, virtual numbers are often preferred by businesses for features such as call forwarding, auto-attendants, voicemail transcription, analytics, and CRM integrations, which help them enhance their local presence in eastern Tennessee.
423 Nearby Area Codes
Location | Area Codes |
| Huntsville, Alabama | 256, 938 |
| Bowling Green, Kentucky | 270, 364 |
| Bristol, Virginia | 276 |
| Greensboro, North Carolina | 336, 743 |
| Knoxville, Tennessee | 865 |
| Ashland, Kentucky | 606 |
| Nashville, Tennessee | 615, 629 |
| Charlotte, North Carolina | 704, 980 |
| Augusta, Georgia | 706, 762 |
| Columbia, South Carolina | 803, 839 |
| Asheville, North Carolina | 828 |
| Greenville, South Carolina | 864 |
| Clarksville, Tennessee | 931 |
Key Features of a 423 Area Code Business Phone Number
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How to Get a Phone Number with Area Code 423?
You can get a 423 area code phone number through any virtual provider. Simply sign up on Calilio and follow the setup steps.
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Create an account on Calilio & log in to your dashboard.
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Navigate to the left sidebar & click the plus symbol (+) located next to the Number section.
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You will land on the My Number page; here, select the Country for your virtual number.
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Select the Number Type and then choose the Capabilities (SMS, Voice, MMS).
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Scroll down, choose an available number from the list, and click the Add to Cart button.
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In the final step, enter your name and click Confirm Purchase from the cart to complete payment and activate your virtual number.
Already Have a 423 Phone Number for Business?
If yes, transfer your existing 423 number to Calilio and enjoy our advanced features.
Why Does Your Business Need a 423 Area Code Number?
Acquiring 423 numbers can help firms build a local presence, boost search results, make frequent calls, and enhance local marketing.
Frequent Calls
Client Trust and Familiarity
Boosts Local Search Results
Enhances Local Marketing
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