Primary Road No. 4 was a state highway in western Iowa. It is related to the current highways:
- U.S. Highway 275 between the Missouri state line and Hillsdale
- U.S. Highway 34 between Hillsdale and Hastings
- U.S. Highway 59 between Hastings and Denison
- Iowa Highway 39 between Dension and Odebolt
- Iowa Highway 175 between Odebolt and near Wall Lake
- Iowa Highway 471 between near Wall Lake to Early
- U.S. Highway 71 between Early and the Minnesota state line
Primary Road No. 4 | ||||
|---|---|---|---|---|
| Route information | ||||
| Maintained by Iowa State Highway Commission | ||||
| Location | ||||
| Country | United States | |||
| State | Iowa | |||
| Highway system | ||||
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