Iowa Primary Highway System
List of Iowa State Highways
- Iowa State Highway 3
- Iowa State Highway 150
- Iowa State Highway 163, originally US-163.
List of U.S. Highways in Iowa
- U.S. Highway 6
- U.S. Highway 20
- U.S. Highway 32
- U.S. Highway 55
- U.S. Highway 63
- U.S. Highway 67
- U.S. Highway 161
- U.S. Highway 163, totally within Iowa from 1934 to 1938.
- U.S. Highway 218