423 Area Code
Eastern Tennessee, Tennessee
Area code 423 is located in Eastern Tennessee, Tennessee. It covers Chattanooga, Kingsport, and surrounding areas in the Eastern time zone (UTC-5). Administered by NANPA.
Where is area code 423?
Area code 423 is located in Eastern Tennessee, Tennessee. It covers Chattanooga, Kingsport, and surrounding areas in the Eastern time zone (UTC-5).
Cities Covered by Area Code 423
Area code 423 primarily serves the Eastern Tennessee area of Tennessee. The exact coverage includes Chattanooga, Kingsport, and Bristol, along with surrounding communities and suburbs.
Time Zone
Eastern Time — UTC-5
Area code 423 operates in the Eastern Time Zone. When calling 423 numbers from a different time zone, be sure to account for the time difference to reach people during business hours.
About Area Code 423
Area code 423 was introduced in 1995 as a geographic area code serving Eastern Tennessee, Tennessee. It remains the primary area code for this region. Area codes are administered by NANPA (North American Numbering Plan Administration), the organization responsible for managing phone number resources in the US and Canada.