Christian county is in the Pennyrile region of Kentucky. The elevation in the county ranges from 390 to 966 feet above sea level.
It was formed in 1797 from Logan county. The county seat is Hopkinsville. Christian county was a source of Henderson (1799), Muhlenberg (1799), Livingston (1799), Todd (1820), and Trigg (1820) counties.
In 2010 the county population was 73,955 in a land area of 717.50 square miles, an average of 103.1 people per square mile.
The equine population was 2,700 in the 2012 Kentucky Equine Survey.