What is what area code is 865?

Area code 865 is a telephone area code in the North American Numbering Plan (NANP) for the U.S. state of Tennessee. It covers Knoxville, the capital city of the state, and the surrounding areas in the eastern part of the state. The area code was established in 1999 as an overlay of area code 423, in order to meet the increasing demand for telephone numbers in the region. Persons living or working within the 865 area code can make direct calls to landline or mobile phones in this area without dialing the area code.