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 2020 the county population was 782,969 in a land area of 380.42 square miles, an average of 2058.2 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 is in the Louisville/Jefferson County metro statistical area and the KIPDA Area Development District.

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

Census Census Data Jefferson County Details Kentucky Counties Google Map County Map Historical Markers National Register Cooperative Extension Adair County Allen County Anderson County Ballard County Barren County Bath County Bell County Boone County Bourbon County Boyd County Boyle County Bracken County Breathitt County Breckinridge County Bullitt County Butler County Caldwell County Calloway County Campbell County Carlisle County Carroll County Carter County Casey County Christian County Clark County Clay County Clinton County Crittendon County Cumberland County Edmonson County Elliott County Estill County Fayette County Fleming County Floyd County Franklin County Gallatin County Fulton County Garrard County Grant County Graves County Grayson County Green County Greenup County Hancock County Hardin County Harlan County Harrison County Hart County Henderson County Henry County Hopkins County Jackson County Jefferson County Jessamine County Johnson County Kenton County Knott County Knox County LaRue County Laurel County Lawrence County Lee County Leslie County Letcher County Lewis County Lincoln County Livingston County Logan County Lyon County McCracken County McCreary County McLean County Madison County Magoffin County Marion County Marshall County Mason County Martin County Meade County Menifee County Mercer County Metcalfe County Monroe County Montgomery County Morgan County Muhlenberg County Nelson County Nicholas County Ohio County Oldham County Owen County Owsley County Pendleton County Perry County Pike County Powell County Pulaski County Robertson County Rockcastle County Rowan County Russell County Scott County Shelby County Simpson County Spencer County Taylor County Todd County Trigg County Trimble County Union County Warren County Washington County Wayne County Webster County Whitley County Wolfe County Woodford County Daviess County Hickman County State of West Virginia State of Ohio Commonwealth of Virginia State of Tennessee State of Missouri State of Illinois State of Indiana

© 2023 David C. Elbon