Robertson county is in the Outer Bluegrass region of Kentucky. The elevation in the county ranges from 550 to 1009 feet above sea level.
In 2010 the county population was 2,282 in a land area of 99.91 square miles, an average of 22.8 people per square mile.
It is the smallest county and the least populous county in the state.
The equine population was 400 in the 2012 Kentucky Equine Survey.
Robertson county was named for George Robertson, legislator and judge.