Green county is in the Pennyrile region of Kentucky. The elevation in the county ranges from 490 to 1045 feet above sea level.
It was formed in 1793 from Lincoln and Nelson counties. The county seat is Greensburg. Green county was a source of Barren (1799), Pulaski (1799), Cumberland (1799), Wayne (1801), Adair (1802), Taylor (1848), and Metcalfe (1860) counties.
In 2010 the county population was 11,258 in a land area of 286.03 square miles, an average of 39.4 people per square mile.
The equine population was 1,100 in the 2012 Kentucky Equine Survey.
Green county was named for General Nathanael Greene, a Quaker from Rhode Island who commanded the American southern army at the end of the Revolution.