Simpson county is in the Pennyrile region of Kentucky. The elevation in the county ranges from 490 to 928 feet above sea level.
In 2010 the county population was 17,327 in a land area of 234.20 square miles, an average of 74.0 people per square mile.
The equine population was 800 in the 2012 Kentucky Equine Survey.
Simpson county is located on the southern border of Kentucky with Tennessee. It was named to honor Captain John Simpson, legislator and soldier, who was killed in the War of 1812.