Joliet, Illinois

Historical marker location:

215 N Ottawa St, Joliet, Illinois

( Marker is at the intersection of North Ottawa Street (Illinois Route 53) and Webster Street, on the right when traveling south on North Ottawa Street.)

Welcome to Route 66 Illinois.

Illinois was part of the French colonial empire, and the city of Cahokia, located near present-day Collinsville, was one of the largest pre-Columbian cities in North America. At its peak, around 1250 CE, Cahokia had a population of around 20,000 people.