Jefferson County

Jefferson County is located in the U.S. state of Indiana. As of 2018, the population was 32,208. The county seat is Madison. Jefferson County was formed on February 1, 1811, from Dearborn and Clark Counties. It was named for Thomas Jefferson, principal draftsman of the Northwest Ordinance and President of the United States from 1801 through 1809. Jefferson County was one of Indiana's first counties, and many important early Hoosiers came from Madison, including William Hendricks. Throughout the early history of the state, Madison was one of the leading cities competing with Vincennes, and later New Albany, to be the largest city in the state. The county fell into economic decline after the American Civil War, as industry began to shift from southern Indiana to the northern part of the state.