Adair county is in the Pennyrile region of Kentucky. The elevation in the county ranges from 585 to 1120 feet above sea level.
In 2010 the county population was 18,656 in a land area of 405.28 square miles, an average of 46.0 people per square mile.
The equine population was 3,400 in the 2012 Kentucky Equine Survey.
Adair county was named to honor General John Adair, who also served as governor of Kentucky.