Iowa Highway 188 (Iowa 188) is a state highway in north-central Iowa. The route is signed both north–south and east–west because of a 90-degree corner near the route's midpoint. The route begins at Iowa Highway 3 south of Clarksville and ends at U.S. Highway 63 near Tripoli.
^2009 Volume of Traffic on the Primary Road System of Iowa (PDF) (Report). Iowa Department of Transportation. January 1, 2009. Retrieved July 5, 2010.
^Iowa Centennial Highway Map(PDF) (Map). Iowa State Highway Commission. 1946. Retrieved June 6, 2011.
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Global Information
Iowa 3 near Clarksville
US 63 near Tripoli
