Illinois Route 5 (IL 5) is a four to six lane state highway in Rock Island County, Illinois, United States, that runs from U.S. Route 67 (US 67) in Rock Island to the interchange of Interstate 80 (I-80) and the toll-free portion of I-88, a distance of .). By 1975, IL 5 was extended to Rock Falls. By 1977, it extended towards IL 2 in Hillsdale. By 1979, IL 5 was extended all the way to US 67 in Rock Island, replacing part of IL 2 west of Sterling in the process. By 1989, the freeway/tollway portion of IL 5 was changed to I-88, while the rest of IL 5 in the Quad Cities remained.

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