Marion County was created on April 1, 1822, from part of the “New Purchase” lands that had been obtained from its inhabitants which were the Lenape, by the Treaty of St. Mary’s. It is named for Francis Marion who was a Brigadier General from South Carolina in the American Revolutionary War. The state capital was moved to Indianapolis in Marion County from Corydon on January 10, 1825. Marion County has a total area of 403 square miles and a population count of 964,582 residents making Marion County the nation’s 55th most populated county.