Jessamine county is in the Inner Bluegrass region of Kentucky. The elevation in the county ranges from 497 to 1072 feet above sea level.
In 2010 the county population was 48,586 in a land area of 172.12 square miles, an average of 282.3 people per square mile.
The equine population was 4,500 in the 2012 Kentucky Equine Survey.
Jessamine county was named for Jessamine Creek. (However the source of the name of the creek is obscure. It may have been named in 1774 by the surveyor James Douglas for his daughter or the flower.)