Columbia is a city in Adair County, Kentucky, United States, just above Russell Creek. The area was settled around 1802 by Daniel Trabue. The post office was opened on April 1, 1806 by John Field, who also ran a local store. The population was 4,014 at the 2000 census. It is the county seat of Adair County. For the origin of the name see Columbia.
The Louie B. Nunn Cumberland Parkway runs through Columbia as it extends from Bowling Green, KY to Somerset, KY. This Parkway is a future Corridor of Interstate 66. The addition of an interchange with a 2006 reconstruction of Highway 61 South, Columbia now has two exits on the Parkway.
Exit 49, the original exit on the parkway, merges onto Highway 55 South (also known as Jamestown Street) bringing drivers through the middle of Columbia.