Lewis county was formed in 1807. It is located in the Outer Bluegrass and Eastern Coal Field regions of the state. The elevation in the county ranges from 485 to 1400 feet above sea level. In 2010 the county population was 13,870 in a land area of 482.84 square miles, an average of 28.7 people per square mile.
The county seat is Vanceburg.
