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IL 166 Travel Info

Illinois Route 166 is a 14.43-mile (23.22 km) north–south state road in southern Illinois, United States. The route runs from its southern terminus at U.S. Route 45 in New Burnside to its northern terminus at Illinois Route 13 east of Marion. Route 166 serves the counties of Johnson and Williamson. It is maintained by the Illinois Department of Transportation (IDOT ... more

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