Iowa Primary Road No. 20
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Primary Road No. 20 was the designation of a state highway that ran from the Missouri state line at Keokuk to the Minnesota state line near Cresco. Today, the route is related to the following highways:
- U.S. Highway 61 between Missouri and Dubuque
- U.S. Highway 52 (formerly U.S. Highway 55) between Dubuque and Decorah
- Iowa Highway 9 between Decorah and Cresco
- Iowa Highway 139 between Decorah and Minnesota
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