423 Area Code - Location map, time zone, and phone lookup Where is area code 423? Area code 423 serves 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 area
Area codes 423 and 729 - Wikipedia 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
423 Area Code Phone Numbers | Whitepages 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
10-Digit Dialing Required in the Tennessee 423 Area Code Starting . . . All customers with the 423 area code should prepare for mandatory 10-digit dialing and the introduction of the new 729 area code Starting August 5, 2025, all local calls made within the 423 area code must be dialed using 10 digits (area code + the 7-digit telephone number)
423 area code — information, time zone, map 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 covers Get the most exact information on time zones here
423 Area Code, Tennessee, United States - Location map, time zone . . . Area code 423 serves eastern Tennessee, including cities such as Chattanooga, Johnson City, Kingsport, and Cleveland It was created in 1995 from a split of area code 615 and was later overlaid in part by 865 to cover the Knoxville metro area