Interstate Highways of the Iowa Primary Highway System
Highway markers for I-80, I-380, and I-35 Bus. Loop
Interstate Highways in Iowa highlighted in red
System information
Formed
August 14, 1957[1]
Highway names
Interstates
Interstate X (I-X)
Business Loops:
Interstate X Business (I-X Bus.)
System links
Iowa Primary Highway System
Interstate
US
State
Secondary
Scenic
Interstate Highways in Iowa form a network of freeways that cross the state.
^Official Route Numbering for the National System of Interstate and Defense Highways (Map). American Association of State Highway Officials. August 14, 1957.
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