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...

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

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...

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...

through northern Iowa, Iowa 107's role in the primary highway system began to diminish. Portions of the route were removed from the system altogether. In...

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...

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...

U.S. Highway 75 (US 75) is a United States Highway in northwestern Iowa. It begins at the Missouri River on a bridge with Interstate 129 (I-129) and US 20...

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 90 (Iowa 90) was a state highway in central Iowa. The highway was in service to traffic from 1932 through 1981 and took several forms over...

Iowa Highway 330 (Iowa 330) is a 47-mile-long (76 km) state highway that travels northeasterly from Altoona past Albion, to just north of Marshalltown...

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...

Iowa Highway 925 (Iowa 925) was a state highway that was an alternative to Interstate 80 (I-80) between Adair and Dexter. It began at exit 75 along I-80...

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 44 (Iowa 44) is an east–west highway in the central and west-central portions of the state. It runs parallel to Interstate 80, which runs...

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...

Iowa Highway 60 (Iowa 60) is a north–south state highway in northwest Iowa. The highway runs at a southwest-to-northeast angle. The southern end of Iowa...

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...

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...

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 9 southeast of Larchwood. The highway has been in the primary highway system since 1930, when it was known as Iowa 26. On January 1, 1969, Iowa 26...

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...

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...

Iowa Highway 163 (Iowa 163) is a state highway that travels from U.S. Highway 69 in Des Moines to US 63 near Oskaloosa. The Iowa Department of Transportation...

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...

U.S. Highway 34 (US 34) is a United States Highway that runs across the southern third of Iowa. It begins on a bridge over the Missouri River west of...

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...

Iowa Highway 28 is a 21.73-mile-long (34.97 km) state highway located in south central Iowa. The route begins at Iowa Highway 92 at Martensdale and ends...

Iowa Highway 59 (Iowa  59) was the designation of a state highway in Iowa that ran from the Missouri state line near Cincinnati to the Minnesota state...