Lyons is a village in Lyons Township, Cook County, Illinois, United States. The population was 10,729 at the 2010 census. The Chicago Portage National Historic Site is located in Lyons.
Although first settled in 1888, Lyons remained as a large unincorporated area of Cook County for several years, before becoming a census-designated place in 2009. The community is greatly steeped in earlier historical roots. In 1673 French Explorer Louis Joliet and Jesuit missionary Father Pierre Marquette left Green Bay, Wisconsin, by canoe in search of a western passage to the Pacific. As they traveled into the Spanish controlled area of Louisiana, they realized that the mighty Mississippi River drained into the already well known Gulf of Mexico. With winter approaching, they headed north as quickly as possible. To save time, the Potawatomi Indians who were with them encouraged changing their route to the Illinois River. The short cut led to the Des Plaines River and caused the French travelers to discover “Le Portage.” This half-mile wide area of land connecting the Chicago River and the Des Plaines River, over which they could carry their canoes and supplies, was to become the discovery for which they would both become famous.