Muhlenberg county is in the Western Coal Field region of Kentucky. The elevation in the county ranges from 355 to 760 feet above sea level.
In 2010 the county population was 31,499 in a land area of 467.08 square miles, an average of 67.4 people per square mile.
The equine population was 1,300 in the 2012 Kentucky Equine Survey.
Muhlenberg county was named for General John Peter Muhlenberg, who served in the American Revolution.
Muhlenberg county is the home of Lake Malone State Park.