McKenzie is a city at the tripoint of Carroll, Henry, and Weakley counties in Tennessee, United States. The population was 5,310 at the 2010 census. The city of McKenzie was originally surveyed and platted in 1865 on land that belonged to James McKenzie. This land was at the crossroads of the main lines for the Nashville & Northwestern Railroad and the Louisville & Memphis Railroad, and a station, originally called "McKenzie Station" was erected at the crossing. The town was incorporated by the state of Tennessee on January 22, 1869.