Metropolis is a city located along the Ohio River in Massac County, Illinois, United States. It has a population of 6,537 according to the 2010 United States Census. Metropolis is the county seat of Massac County and is part of the Paducah, KY-IL Micropolitan Statistical Area in Southern Illinois.
Located on the Ohio River, the Metropolis area has been settled by many different peoples throughout history. For thousands of years, varying cultures of Native Americans populated the area. The most complex society was the Mississippian culture, which reached its peak around AD 1100 and built a large city at Cahokia, near the Mississippi River and present-day Collinsville, Illinois, to the north opposite St. Louis, Missouri. Its people built large earthworks and related structures, many of which have been preserved and protected at the UNESCO World Heritage Site. Mississippian culture regional centers arose throughout the Ohio and lower Mississippian valleys, where the rivers were part of widespread trading routes used for exchange with other cultures.
In 1757, Massac County was settled by a French expedition, which built Fort De L'Ascension for use during the French and Indian War against the British (the war is also known as the Seven Years' War, which took place largely in Europe).