Area Code 423 is an area code in Tennessee that covers the cities of two separate and disconnected portions of East Tennessee. On the north is Bristol, Johnson City and Kingsport; on the south lies Chattanooga and Cleveland. Area code 865 broke off from this area code in the year 1999. Official language(s) English Capital Nashville Largest city Memphis Area Ranked 36th - Total 42,169 sq mi (109,247 km²) - Width 120 miles (195 km) - Length 440 miles (710 km) - % water 2. ... East Tennessee is a name given to approximately the eastern third of the state of Tennessee. ... Nickname: The Birthplace of Country Music Motto: A Good Place To Live Location Coordinates , Government Country State County United States Tennessee Sullivan Mayor Jim Messimer Geographical characteristics Area City 76. ... Johnson City is a city in Washington County, Tennessee; however a small part of the city is located within Carter County, Tennessee. ... Kingsport is a city located in Sullivan County, Tennessee. ... Nickname: Scenic City (official), River City, Chatty, Chatt-Town, Chattavegas, The Nooga Location within the U.S. State of Tennessee Cities in Tennessee Tennessee Mayor Ron Littlefield Area - City 370. ... Cleveland is a city in Bradley County, Tennessee, United States. ... 1999 (MCMXCIX) was a common year starting on Friday, and was designated the International Year of Older Persons by the United Nations. ...