Simpson county is in the Pennyrile region of Kentucky. The elevation in the county ranges from 490 to 928 feet above sea level.
It was formed in 1819 from Allen, Logan, and Warren counties. The county seat is Franklin.
In 2020 the county population was 19,594 in a land area of 234.20 square miles, an average of 83.7 people per square mile.
The equine population was 800 in the 2012 Kentucky Equine Survey.
Simpson county is in the Barren River Area Development District.
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.
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