Kentucky Atlas and Gazetteer

Jefferson County, Kentucky

Jefferson county is in the Outer Bluegrass region of Kentucky. The elevation in the county ranges from 383 to 902 feet above sea level.

It was formed in 1780. Jefferson county was a source of Nelson (1785), Shelby (1792), Bullitt (1797), and Oldham (1824) counties. The county seat is Louisville.

In 2010 the county population was 741,096 in a land area of 380.42 square miles, an average of 1948.1 people per square mile.

It is the most populous county and the most densely populated county in the state.

The equine population was 7,400 in the 2012 Kentucky Equine Survey.

Jefferson county was one of the original counties in Kentucky territory of Virginia. It was named for Thomas Jefferson, who was governor of Virginia at the time the county was formed.

The Louisville and Jefferson county governments are merged into the Louisville/Jefferson County Metro Government.

Most of Jefferson county is urban and there were more than 90 incorporated cities in the county, some of which were completely surrounded by Louisville, before the merger in 2003. More than 80 remain.

Incorporated Cities in Jefferson County


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