In 1995, the eastern portion of 615, including Knoxville, Chattanooga, and the Tri-Cities, was split off with area code 423. This was the first new area code in the state in 41 years.

Dec 1, 2025 · Area Code 423 is located in Tennessee. It covers 90 cities, including Chattanooga, Johnson City, Morristown, Cleveland, and Kingsport. It also covers 28 counties, including …

Browse area code 423 phone numbers, prefixes and exchanges. The 423 area code serves Chattanooga, Knoxville, Johnson City, Bristol, Kingsport, covering 86 ZIP codes in 30 counties.

Find 423 area code details including city, time zone, and map. Lookup area code 423 phone number, name, and location.

Area code 423 is located in Tennessee. Get the area’s map, cities covered, current time, prefixes, and dialing instructions.

423 is an area code located in the state of Tennessee, US. The largest city it serves is Chattanooga. Find out where 423 area code zone from, which states, counties and cities it …

Area code 423 is the area code for central Tennessee, north and south of Knoxville. It includes the cities of Chattanooga, Johnson City, and Kingsport. It is the only area code that serves the …

List of ZIP Codes in Area Code 423 ... List of Counties in Area Code 423 ... List of Major Cities/Towns in Area Code 423

About area code 423: location, common spam callers, related area codes, and more. Includes 423 reverse phone lookup to identify spam callers.

Jul 29, 2025 · All customers with the 423 area code should prepare for mandatory 10-digit dialing and the introduction of the new 729 area code. Starting Aug. 5, all local calls made within the …