Iowa Primary Road No. 4

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