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Where Is 423 Area Code?

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Database Updated: August 13, 2025
Tennessee Phone Number Lookups
Where Is 423 Area Code?

Where is Area Code 423?

Area code 423 is located in the state of Tennessee. It serves a significant portion of the eastern part of the state, covering several major cities and counties. Here are the key areas included within this area code:

  • Chattanooga
  • Johnson City
  • Kingsport
  • Bristol
  • Cleveland
  • Greeneville

The area code encompasses a diverse range of regions, providing telecommunication services to both urban and rural communities. For more detailed information about the regions covered by area code 423, you can visit the Tennessee Public Utilities Commission.

Tennessee Public Utilities Commission
502 Deaderick Street, 4th Floor, Nashville, TN 37243
Phone: (800) 342-8359
Phone: (615) 741-2904
E-mail: contact.tpuc@tn.gov

What time zone is 423 area code in the USA?

The 423 area code is situated in the Eastern Time Zone (ET). This time zone observes daylight saving time, meaning clocks are set forward by one hour in the spring and set back by one hour in the fall. This adjustment helps to make better use of daylight during the longer days of summer. For precise timekeeping, you can refer to the National Institute of Standards and Technology.

History of the 423 Area Code

The 423 area code was created in 1995 as a result of a split from the original 615 area code. This change was necessitated by the increasing demand for new telephone numbers, driven by population growth and the proliferation of mobile devices. The split was designed to provide sufficient numbering resources for the eastern part of Tennessee.

In 1999, the area code underwent another change when the 865 area code was introduced to serve the Knoxville area, further refining the regions covered by 423. These adjustments were part of a broader effort to manage the allocation of telephone numbers efficiently. For more information on the history and management of area codes, visit the North American Numbering Plan Administrator (NANPA).

NANPA Mailing Address
One Tower Center Boulevard
Suite 800
East Brunswick, NJ 08816

NANPA Customer Support
Tel: 1-866-623-2282
Email: support@nanpa.com
Fax: 571-363-3838

How Many People Use the 423 Area Code?

The 423 area code serves a population of over 1.3 million people. This figure represents the residents and businesses within the geographic boundaries of the area code, encompassing both urban centers and rural areas. For more detailed demographic information, you can consult the U.S. Census Bureau.

U.S. Census Bureau
4600 Silver Hill Road, Washington, DC 20233
Tel: 301-763-INFO (4636) or 800-923-8282

Is the 423 Area Code Toll-Free?

The 423 area code is a geographic area code, not a toll-free number. It is designated for a specific region within Tennessee and is used for local telephone services. Toll-free numbers in the United States typically begin with the prefixes 800, 888, 877, 866, 855, 844, or 833. These numbers are not tied to a specific geographic location and are used by businesses and organizations to allow customers to reach them without incurring long-distance charges. For more information on toll-free numbers, you can visit the Federal Communications Commission.

Federal Communications Commission
45 L Street NE, Washington, DC 20554
Tel: 1-888-CALL FCC (225-5322)
https://www.fcc.gov/

Tennessee Phone Numbers
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