The primary highway system makes up over 9,000 miles (14,000 km), approximately 8 percent of the U.S. state of Iowa's public road system. The Iowa Department...

major highways that were on the secondary system, which is made up of all rural roads not on the primary highway system. At the time, the Iowa Code provided...

State highways in the U.S. state of Iowa are owned and maintained by the Iowa Department of Transportation. 2012 Volume of Traffic on the Primary Road...

the Iowa Department of Transportation and individual county boards of supervisors led to a mass transfer of jurisdiction of several state highways in Iowa...

Iowa Highway 92 (Iowa 92) is a state highway that runs from east to west across the state of Iowa. Iowa 92 is 279 miles (449 km) long and is part of a...

Iowa Highway 17 (Iowa 17) is a 103-mile-long (166 km) north–south state highway that traverses primarily rural areas in central and north-central Iowa...

Iowa Highway 3 (Iowa 3) is a state highway that runs from east to west across the state of Iowa. It is the longest state highway in Iowa, at 323 miles...

Iowa Highway 64 (Iowa 64) is a 64-mile-long (103 km) state highway that runs through two counties in east central Iowa. It begins at an interchange with...

Iowa Highway 5 is a highway in southern Iowa. It is a north–south highway with a length of 105 miles (169 km). It is the northernmost segment of a three-state...

Interstate Highways in Iowa form a network of freeways that cross the U.S. state of Iowa as part of the Interstate Highway System. Primary Interstates...

Iowa Highway 9 is the most northern of Iowa's east–west highways, traversing the entire northern tier of counties. It runs from the eastern terminus of...

S. Highway 30 (US 30) is a major east–west U.S. Highway which spans 330 miles (530 km) across the state of Iowa. It is the longest primary highway in...

Iowa Highway 2 (Iowa 2) is a 251-mile-long (404 km) state highway which runs across the southernmost tier of counties in the U.S. state of Iowa. At no...

Iowa Highway 141 (Iowa 141) is an east–west highway in the western and central portions of the state. It is the most direct link between Sioux City and...

Iowa Highway 13 (Iowa 13) is a north–south highway in eastern Iowa. It has a length of 85+1⁄4 miles (137.2 km). The southern terminus of Iowa Highway...

Iowa Highway 136 (Iowa 136) is a state highway maintained by the Iowa Department of Transportation. It runs for 87.611 miles (140.996 km) in eastern Iowa...

spur route connecting What Cheer to Primary Road No. 2, it is an original route in the Iowa primary highway system. In the early 1930s, the route was extended...

from the early and mid-1960s showed I-280 in Omaha. Since this highway would extend into Iowa and I-280 was already planned for the Quad Cities area, this...

president, making Iowa 1 one of the oldest routes in the state, pre-dating the current primary highway system by nearly eighty years. The highway was seriously...

U.S. Highway 6 (US 6) is an east–west United States Numbered Highway which runs 322 miles (518 km) across the U.S. state of Iowa. The route is signed...

Moines River, and ended at Iowa 16 north of Douds. There have been two instances of Iowa 98 since Iowa's Primary Highway System was created in 1920. The...

U.S. Highway 59 (US 59) is a United States Highway that transverses the western third of Iowa. It begins at the Missouri state line southwest of Northboro...

Iowa Highway 4 (Iowa 4) is a state highway which runs from north to south across the state of Iowa. It is 146 miles (235 km) long, beginning at an intersection...

U.S. Highway 18 (US 18) is the northernmost east–west United States Numbered Highway in the state of Iowa. As with all state highways in Iowa, it is maintained...

was removed from the primary highway system in 1968. Iowa 7 began at the cloverleaf interchange between I-29 and two U.S. Highways – US 20 and US 77 in...

Iowa Highway 143 (Iowa 143) is a north–south state highway in northwestern Iowa. The highway is 12 miles (19 km) long. The route was designated in 1926...

Iowa Highway 412 (Iowa 412) was a state highway in Waterloo, Iowa. It began at U.S. Highway 63 (US 63) in southwestern Waterloo and traveled to the east...

Iowa Highway 471 (Iowa 471) is a state highway that is located entirely within Sac County. It was designated in November 2015 when a 20-mile (32 km) portion...

Iowa Highway 91 (Iowa 91) was a short state highway in northwestern Iowa. It began at Iowa 9 between Rock Rapids and Little Rock and ended at the Minnesota...

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...