Marion County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 37,729. Its county seat is Salem.
Marion County Courthouse in Salem
Illinois is a state in the Midwestern region of the United States. It borders Lake Michigan to its northeast, the Mississippi River to its west, and the Wabash and Ohio rivers to its south. Of the fifty U.S. states, Illinois has the fifth-largest gross domestic product (GDP), the sixth-largest population, and the 25th-most land area. Its largest urban areas include Chicago and the Metro East of Greater St. Louis, as well as Peoria, Rockford, Champaign–Urbana, and Springfield, the state's capital.
Mississippian copper plate found at the Saddle Site in Union County, Illinois
Illinois in 1718, approximate modern state area highlighted, from Carte de la Louisiane et du cours du Mississipi by Guillaume de L'Isle
The bell donated by King Louis XV in 1741 to the French mission at Kaskaskia. It was later called the "Liberty Bell of the West", after it was rung to celebrate U.S. victory in the Revolution
Old State Capitol: Abraham Lincoln and other area legislators were instrumental in moving the state capitol to centrally located Springfield in 1839.