The city of Clarksville is the county seat of Montgomery County, Tennessee, United States. It is the fifth-largest city in the state behind Nashville, Memphis, Knoxville, and Chattanooga. The city had a population of 132,929 at the 2010 census, and an estimated population of 150,287 in 2016.It is the principal central city of the Clarksville, TN-KY metropolitan statistical area, which consists of Montgomery and Stewart Counties in Tennessee, and Christian and Trigg Counties in Kentucky. The city was founded in 1785 and incorporated in 1807, and named for General George Rogers Clark, frontier fighter and Revolutionary War hero, and brother of William Clark of the Lewis and Clark Expedition.Clarksville is the home of Austin Peay State University; The Leaf-Chronicle, the oldest newspaper in Tennessee; and neighbor to the Fort Campbell, United States Army base.