was shown on maps in 1932, mainly on its current routing except for a more southerly routing from Princeton to Spring Valley through DePue and at the Illinois–Indiana line. In 1934, both portions were changed to its current routing, from Princeton to Spring Valley and in Lockport. By 1939, US 6 was rerouted in the Quad Cities, briefly forming US 6 City. By 1953, the route was rerouted to travel along Torrence Avenue and part of the Kingery Expressway (from US 30 Alternate to Indiana state line). Prior to the formation of US 6, the road west of Princeton was US 32. US 32 remained for several more years until the part east of Princeton became an extension of US 34. Major intersections References External links 06 Illinois Transportation in Rock Island County, Illinois Transportation in Henry County, Illinois Transportation in Bureau County, Illinois Transportation in LaSalle County, Illinois Transportation in Grundy County, Illinois Transportation in Will County, Illinois Transportation in Cook County, Illinois