Christian County is a county located in the U.S. state of Kentucky. As of the 2020 census, the population was 72,748. Its county seat is Hopkinsville. The county was formed in 1797. Christian County is part of the Clarksville, Tennessee–Kentucky Metropolitan Statistical Area.

Clarksville is the county seat of Montgomery County, Tennessee, United States. It is the fifth-most populous city in the state, after Nashville, Memphis, Knoxville, and Chattanooga. The city had a population of 166,722 as of the 2020 census.