Clarksville the county seat of Montgomery County, Tennessee. Tennessee's fifth-largest city behind Memphis, Nashville, Knoxville, and Chattanooga, the city had a population of 132,957 at the 2010 census, and an estimated population of 149,176 in 2015.

Clarksville is notable for being Tennessee's first incorporated city in 1785.  It is named for General George Rogers Clark, frontier fighter and Revolutionary War hero, and brother of William Clark of the Lewis and Clark Expedition.

It is the TN-KY metropolitan statistical area's principal central city.  The area consists of  Montgomery and Stewart Counties in Tennessee, and Christian and Trigg Counties in Kentucky. 

Notably, Clarksville is the home of Austin Peay State University and neighbors the United States' Army base, Fort Campbell. Fort Campbell is located about 10 miles (16 km) from downtown Clarksville, straddling the Tennessee-Kentucky state line and is the home base of the 101st Airborne Division (Air Assault). While officially "Fort Campbell, Kentucky", because the base's U.S. Post Office is on the Kentucky side of the post, the majority of the acreage of Fort Campbell is within the state of Tennessee.

Source: Wikipedia

To learn more about this thriving city, visit the City of Clarksville website.