[Pulp Fiction]

http://quickfacts.census.gov/qfd/maps/kentucky_map.html

Click on your county, scroll down to the bottom of the page....
Look for "Geography QuickFacts" on the left.
Right below that... it will say "Land area in square miles, 2010". Look over to the right, and it will tell you how big your county is by Square Miles.

I was surprised at the size of some counties.

Pike County is the largest with 786.83 sq. miles
Christian County is 2nd with 717.50 sq. miles
Pulaski County is 3rd with 658.41 sq. miles
Hardin County is 4th with 623.28 sq. miles

Gallatin County is the 2nd smallest county with 101.23 sq. miles
Robertson County is the smallest county with 99.91 sq. miles