Since 2003, Louisville and Jefferson County have shared the same borders following a city-county merger, creating the consolidated Louisville/Jefferson County Metro Government, commonly called Louisville Metro. While “Jefferson County” is still used for certain incorporated cities outside the main Louisville area, the balance area of the city proper had a population of 633,045 in 2020, contributing to the larger consolidated population of 782,969. The broader Louisville metropolitan area spans 12 counties across Kentucky and Southern Indiana, home to 1.39 million residents, ranking it as the 43rd-largest metro area in the United States.

Founded in 1778 by George Rogers Clark and named after King Louis XVI of France, Louisville is one of the oldest cities west of the Appalachians. Its location near the Falls of the Ohio made it a key portage site, spurring early growth. The city later became the birthplace of the Louisville and Nashville Railroad, which expanded into a 6,000-mile network across 13 states.

Today, Louisville is internationally recognized as the hometown of boxing legend Muhammad Ali and as the host city of the Kentucky Derby. It also boasts cultural and economic landmarks such as the Louisville Slugger Museum, the University of Louisville and its Cardinals, Kentucky Fried Chicken, and Fortune 500 company Humana. With a unique blend of history, innovation, and cultural significance, Louisville continues to be a vibrant city at the heart of the Ohio River Valley.